ClickHouse/src/Storages/MergeTree/MergeTreeData.cpp
2020-05-20 15:02:02 +03:00

3698 lines
137 KiB
C++

#include <Compression/CompressedReadBuffer.h>
#include <DataStreams/ExpressionBlockInputStream.h>
#include <DataStreams/copyData.h>
#include <DataTypes/DataTypeArray.h>
#include <DataTypes/DataTypeDate.h>
#include <DataTypes/DataTypeDateTime.h>
#include <DataTypes/DataTypeEnum.h>
#include <DataTypes/DataTypeNullable.h>
#include <DataTypes/NestedUtils.h>
#include <Formats/FormatFactory.h>
#include <Functions/FunctionFactory.h>
#include <Functions/IFunction.h>
#include <IO/ConcatReadBuffer.h>
#include <IO/HexWriteBuffer.h>
#include <IO/Operators.h>
#include <IO/ReadBufferFromMemory.h>
#include <IO/WriteBufferFromString.h>
#include <Interpreters/ExpressionAnalyzer.h>
#include <Interpreters/PartLog.h>
#include <Interpreters/SyntaxAnalyzer.h>
#include <Parsers/ASTFunction.h>
#include <Parsers/ASTLiteral.h>
#include <Parsers/ASTNameTypePair.h>
#include <Parsers/ASTPartition.h>
#include <Parsers/ASTSetQuery.h>
#include <Parsers/ExpressionListParsers.h>
#include <Parsers/parseQuery.h>
#include <Parsers/queryToString.h>
#include <Storages/AlterCommands.h>
#include <Storages/MergeTree/MergeTreeData.h>
#include <Storages/MergeTree/MergeTreeDataPartInMemory.h>
#include <Storages/MergeTree/MergeTreeDataPartCompact.h>
#include <Storages/MergeTree/MergeTreeDataPartWide.h>
#include <Storages/MergeTree/MergeTreeSequentialSource.h>
#include <Storages/MergeTree/MergedBlockOutputStream.h>
#include <Storages/MergeTree/MergedColumnOnlyOutputStream.h>
#include <Storages/MergeTree/checkDataPart.h>
#include <Storages/MergeTree/localBackup.h>
#include <Storages/StorageMergeTree.h>
#include <Storages/StorageReplicatedMergeTree.h>
#include <Common/Increment.h>
#include <Common/SimpleIncrement.h>
#include <Common/Stopwatch.h>
#include <Common/StringUtils/StringUtils.h>
#include <Common/escapeForFileName.h>
#include <Common/quoteString.h>
#include <Common/typeid_cast.h>
#include <Poco/DirectoryIterator.h>
#include <boost/range/adaptor/filtered.hpp>
#include <algorithm>
#include <iomanip>
#include <optional>
#include <set>
#include <thread>
#include <typeinfo>
#include <typeindex>
#include <unordered_set>
namespace ProfileEvents
{
extern const Event RejectedInserts;
extern const Event DelayedInserts;
extern const Event DelayedInsertsMilliseconds;
}
namespace CurrentMetrics
{
extern const Metric DelayedInserts;
}
namespace
{
constexpr UInt64 RESERVATION_MIN_ESTIMATION_SIZE = 1u * 1024u * 1024u; /// 1MB
}
namespace DB
{
namespace ErrorCodes
{
extern const int NO_SUCH_DATA_PART;
extern const int NOT_IMPLEMENTED;
extern const int DIRECTORY_ALREADY_EXISTS;
extern const int TOO_MANY_UNEXPECTED_DATA_PARTS;
extern const int DUPLICATE_DATA_PART;
extern const int NO_SUCH_COLUMN_IN_TABLE;
extern const int LOGICAL_ERROR;
extern const int ILLEGAL_COLUMN;
extern const int CORRUPTED_DATA;
extern const int BAD_TYPE_OF_FIELD;
extern const int BAD_ARGUMENTS;
extern const int INVALID_PARTITION_VALUE;
extern const int METADATA_MISMATCH;
extern const int PART_IS_TEMPORARILY_LOCKED;
extern const int TOO_MANY_PARTS;
extern const int INCOMPATIBLE_COLUMNS;
extern const int BAD_TTL_EXPRESSION;
extern const int INCORRECT_FILE_NAME;
extern const int BAD_DATA_PART_NAME;
extern const int UNKNOWN_SETTING;
extern const int READONLY_SETTING;
extern const int ABORTED;
extern const int UNKNOWN_PART_TYPE;
extern const int UNEXPECTED_AST_STRUCTURE;
extern const int UNKNOWN_DISK;
extern const int NOT_ENOUGH_SPACE;
}
const char * DELETE_ON_DESTROY_MARKER_PATH = "delete-on-destroy.txt";
MergeTreeData::MergeTreeData(
const StorageID & table_id_,
const String & relative_data_path_,
const StorageInMemoryMetadata & metadata,
Context & context_,
const String & date_column_name,
const MergingParams & merging_params_,
std::unique_ptr<MergeTreeSettings> storage_settings_,
bool require_part_metadata_,
bool attach,
BrokenPartCallback broken_part_callback_)
: IStorage(table_id_)
, global_context(context_)
, merging_params(merging_params_)
, partition_by_ast(metadata.partition_by_ast)
, sample_by_ast(metadata.sample_by_ast)
, settings_ast(metadata.settings_ast)
, require_part_metadata(require_part_metadata_)
, relative_data_path(relative_data_path_)
, broken_part_callback(broken_part_callback_)
, log_name(table_id_.getNameForLogs())
, log(&Logger::get(log_name))
, storage_settings(std::move(storage_settings_))
, data_parts_by_info(data_parts_indexes.get<TagByInfo>())
, data_parts_by_state_and_info(data_parts_indexes.get<TagByStateAndInfo>())
, parts_mover(this)
, in_memory_merges_throttler(storage_settings.get()->min_bytes_for_compact_part, storage_settings.get()->min_rows_for_compact_part)
{
if (relative_data_path.empty())
throw Exception("MergeTree storages require data path", ErrorCodes::INCORRECT_FILE_NAME);
const auto settings = getSettings();
setProperties(metadata, /*only_check*/ false, attach);
/// NOTE: using the same columns list as is read when performing actual merges.
merging_params.check(getColumns().getAllPhysical());
if (sample_by_ast)
{
sampling_expr_column_name = sample_by_ast->getColumnName();
if (!primary_key_sample.has(sampling_expr_column_name)
&& !attach && !settings->compatibility_allow_sampling_expression_not_in_primary_key) /// This is for backward compatibility.
throw Exception("Sampling expression must be present in the primary key", ErrorCodes::BAD_ARGUMENTS);
auto syntax = SyntaxAnalyzer(global_context).analyze(sample_by_ast, getColumns().getAllPhysical());
columns_required_for_sampling = syntax->requiredSourceColumns();
}
MergeTreeDataFormatVersion min_format_version(0);
if (!date_column_name.empty())
{
try
{
partition_by_ast = makeASTFunction("toYYYYMM", std::make_shared<ASTIdentifier>(date_column_name));
initPartitionKey();
if (minmax_idx_date_column_pos == -1)
throw Exception("Could not find Date column", ErrorCodes::BAD_TYPE_OF_FIELD);
}
catch (Exception & e)
{
/// Better error message.
e.addMessage("(while initializing MergeTree partition key from date column " + backQuote(date_column_name) + ")");
throw;
}
}
else
{
is_custom_partitioned = true;
initPartitionKey();
min_format_version = MERGE_TREE_DATA_MIN_FORMAT_VERSION_WITH_CUSTOM_PARTITIONING;
}
setTTLExpressions(metadata.columns, metadata.ttl_for_table_ast);
/// format_file always contained on any data path
PathWithDisk version_file;
/// Creating directories, if not exist.
for (const auto & [path, disk] : getRelativeDataPathsWithDisks())
{
disk->createDirectories(path);
disk->createDirectories(path + "detached");
auto current_version_file_path = path + "format_version.txt";
if (disk->exists(current_version_file_path))
{
if (!version_file.first.empty())
{
LOG_ERROR(log, "Duplication of version file " <<
fullPath(version_file.second, version_file.first) << " and " << current_version_file_path);
throw Exception("Multiple format_version.txt file", ErrorCodes::CORRUPTED_DATA);
}
version_file = {current_version_file_path, disk};
}
}
/// If not choose any
if (version_file.first.empty())
version_file = {relative_data_path + "format_version.txt", getStoragePolicy()->getAnyDisk()};
bool version_file_exists = version_file.second->exists(version_file.first);
// When data path or file not exists, ignore the format_version check
if (!attach || !version_file_exists)
{
format_version = min_format_version;
auto buf = version_file.second->writeFile(version_file.first);
writeIntText(format_version.toUnderType(), *buf);
}
else
{
auto buf = version_file.second->readFile(version_file.first);
UInt32 read_format_version;
readIntText(read_format_version, *buf);
format_version = read_format_version;
if (!buf->eof())
throw Exception("Bad version file: " + fullPath(version_file.second, version_file.first), ErrorCodes::CORRUPTED_DATA);
}
if (format_version < min_format_version)
{
if (min_format_version == MERGE_TREE_DATA_MIN_FORMAT_VERSION_WITH_CUSTOM_PARTITIONING.toUnderType())
throw Exception(
"MergeTree data format version on disk doesn't support custom partitioning",
ErrorCodes::METADATA_MISMATCH);
}
String reason;
if (!canUsePolymorphicParts(*settings, &reason) && !reason.empty())
LOG_WARNING(log, reason + " Settings 'min_bytes_for_wide_part' and 'min_bytes_for_wide_part' will be ignored.");
}
StorageInMemoryMetadata MergeTreeData::getInMemoryMetadata() const
{
StorageInMemoryMetadata metadata(getColumns(), getIndices(), getConstraints());
if (partition_by_ast)
metadata.partition_by_ast = partition_by_ast->clone();
if (order_by_ast)
metadata.order_by_ast = order_by_ast->clone();
if (primary_key_ast)
metadata.primary_key_ast = primary_key_ast->clone();
if (ttl_table_ast)
metadata.ttl_for_table_ast = ttl_table_ast->clone();
if (sample_by_ast)
metadata.sample_by_ast = sample_by_ast->clone();
if (settings_ast)
metadata.settings_ast = settings_ast->clone();
return metadata;
}
StoragePolicyPtr MergeTreeData::getStoragePolicy() const
{
return global_context.getStoragePolicy(getSettings()->storage_policy);
}
static void checkKeyExpression(const ExpressionActions & expr, const Block & sample_block, const String & key_name)
{
for (const ExpressionAction & action : expr.getActions())
{
if (action.type == ExpressionAction::ARRAY_JOIN)
throw Exception(key_name + " key cannot contain array joins", ErrorCodes::ILLEGAL_COLUMN);
if (action.type == ExpressionAction::APPLY_FUNCTION)
{
IFunctionBase & func = *action.function_base;
if (!func.isDeterministic())
throw Exception(key_name + " key cannot contain non-deterministic functions, "
"but contains function " + func.getName(),
ErrorCodes::BAD_ARGUMENTS);
}
}
for (const ColumnWithTypeAndName & element : sample_block)
{
const ColumnPtr & column = element.column;
if (column && (isColumnConst(*column) || column->isDummy()))
throw Exception{key_name + " key cannot contain constants", ErrorCodes::ILLEGAL_COLUMN};
if (element.type->isNullable())
throw Exception{key_name + " key cannot contain nullable columns", ErrorCodes::ILLEGAL_COLUMN};
}
}
void MergeTreeData::setProperties(const StorageInMemoryMetadata & metadata, bool only_check, bool attach)
{
if (!metadata.order_by_ast)
throw Exception("ORDER BY cannot be empty", ErrorCodes::BAD_ARGUMENTS);
ASTPtr new_sorting_key_expr_list = extractKeyExpressionList(metadata.order_by_ast);
ASTPtr new_primary_key_expr_list = metadata.primary_key_ast
? extractKeyExpressionList(metadata.primary_key_ast) : new_sorting_key_expr_list->clone();
if (merging_params.mode == MergeTreeData::MergingParams::VersionedCollapsing)
new_sorting_key_expr_list->children.push_back(std::make_shared<ASTIdentifier>(merging_params.version_column));
size_t primary_key_size = new_primary_key_expr_list->children.size();
size_t sorting_key_size = new_sorting_key_expr_list->children.size();
if (primary_key_size > sorting_key_size)
throw Exception("Primary key must be a prefix of the sorting key, but its length: "
+ toString(primary_key_size) + " is greater than the sorting key length: " + toString(sorting_key_size),
ErrorCodes::BAD_ARGUMENTS);
Names new_primary_key_columns;
Names new_sorting_key_columns;
NameSet primary_key_columns_set;
for (size_t i = 0; i < sorting_key_size; ++i)
{
String sorting_key_column = new_sorting_key_expr_list->children[i]->getColumnName();
new_sorting_key_columns.push_back(sorting_key_column);
if (i < primary_key_size)
{
String pk_column = new_primary_key_expr_list->children[i]->getColumnName();
if (pk_column != sorting_key_column)
throw Exception("Primary key must be a prefix of the sorting key, but in position "
+ toString(i) + " its column is " + pk_column + ", not " + sorting_key_column,
ErrorCodes::BAD_ARGUMENTS);
if (!primary_key_columns_set.emplace(pk_column).second)
throw Exception("Primary key contains duplicate columns", ErrorCodes::BAD_ARGUMENTS);
new_primary_key_columns.push_back(pk_column);
}
}
auto all_columns = metadata.columns.getAllPhysical();
/// Order by check AST
if (order_by_ast && only_check)
{
/// This is ALTER, not CREATE/ATTACH TABLE. Let us check that all new columns used in the sorting key
/// expression have just been added (so that the sorting order is guaranteed to be valid with the new key).
ASTPtr added_key_column_expr_list = std::make_shared<ASTExpressionList>();
for (size_t new_i = 0, old_i = 0; new_i < sorting_key_size; ++new_i)
{
if (old_i < sorting_key_columns.size())
{
if (new_sorting_key_columns[new_i] != sorting_key_columns[old_i])
added_key_column_expr_list->children.push_back(new_sorting_key_expr_list->children[new_i]);
else
++old_i;
}
else
added_key_column_expr_list->children.push_back(new_sorting_key_expr_list->children[new_i]);
}
if (!added_key_column_expr_list->children.empty())
{
auto syntax = SyntaxAnalyzer(global_context).analyze(added_key_column_expr_list, all_columns);
Names used_columns = syntax->requiredSourceColumns();
NamesAndTypesList deleted_columns;
NamesAndTypesList added_columns;
getColumns().getAllPhysical().getDifference(all_columns, deleted_columns, added_columns);
for (const String & col : used_columns)
{
if (!added_columns.contains(col) || deleted_columns.contains(col))
throw Exception("Existing column " + col + " is used in the expression that was "
"added to the sorting key. You can add expressions that use only the newly added columns",
ErrorCodes::BAD_ARGUMENTS);
if (metadata.columns.getDefaults().count(col))
throw Exception("Newly added column " + col + " has a default expression, so adding "
"expressions that use it to the sorting key is forbidden",
ErrorCodes::BAD_ARGUMENTS);
}
}
}
auto new_sorting_key_syntax = SyntaxAnalyzer(global_context).analyze(new_sorting_key_expr_list, all_columns);
auto new_sorting_key_expr = ExpressionAnalyzer(new_sorting_key_expr_list, new_sorting_key_syntax, global_context)
.getActions(false);
auto new_sorting_key_sample =
ExpressionAnalyzer(new_sorting_key_expr_list, new_sorting_key_syntax, global_context)
.getActions(true)->getSampleBlock();
checkKeyExpression(*new_sorting_key_expr, new_sorting_key_sample, "Sorting");
auto new_primary_key_syntax = SyntaxAnalyzer(global_context).analyze(new_primary_key_expr_list, all_columns);
auto new_primary_key_expr = ExpressionAnalyzer(new_primary_key_expr_list, new_primary_key_syntax, global_context)
.getActions(false);
Block new_primary_key_sample;
DataTypes new_primary_key_data_types;
for (size_t i = 0; i < primary_key_size; ++i)
{
const auto & elem = new_sorting_key_sample.getByPosition(i);
new_primary_key_sample.insert(elem);
new_primary_key_data_types.push_back(elem.type);
}
ASTPtr skip_indices_with_primary_key_expr_list = new_primary_key_expr_list->clone();
ASTPtr skip_indices_with_sorting_key_expr_list = new_sorting_key_expr_list->clone();
MergeTreeIndices new_indices;
if (!metadata.indices.indices.empty())
{
std::set<String> indices_names;
for (const auto & index_ast : metadata.indices.indices)
{
const auto & index_decl = std::dynamic_pointer_cast<ASTIndexDeclaration>(index_ast);
new_indices.push_back(
MergeTreeIndexFactory::instance().get(
all_columns,
std::dynamic_pointer_cast<ASTIndexDeclaration>(index_decl),
global_context,
attach));
if (indices_names.find(new_indices.back()->name) != indices_names.end())
throw Exception(
"Index with name " + backQuote(new_indices.back()->name) + " already exsists",
ErrorCodes::LOGICAL_ERROR);
ASTPtr expr_list = MergeTreeData::extractKeyExpressionList(index_decl->expr->clone());
for (const auto & expr : expr_list->children)
{
skip_indices_with_primary_key_expr_list->children.push_back(expr->clone());
skip_indices_with_sorting_key_expr_list->children.push_back(expr->clone());
}
indices_names.insert(new_indices.back()->name);
}
}
auto syntax_primary = SyntaxAnalyzer(global_context).analyze(
skip_indices_with_primary_key_expr_list, all_columns);
auto new_indices_with_primary_key_expr = ExpressionAnalyzer(
skip_indices_with_primary_key_expr_list, syntax_primary, global_context).getActions(false);
auto syntax_sorting = SyntaxAnalyzer(global_context).analyze(
skip_indices_with_sorting_key_expr_list, all_columns);
auto new_indices_with_sorting_key_expr = ExpressionAnalyzer(
skip_indices_with_sorting_key_expr_list, syntax_sorting, global_context).getActions(false);
if (!only_check)
{
setColumns(std::move(metadata.columns));
order_by_ast = metadata.order_by_ast;
sorting_key_columns = std::move(new_sorting_key_columns);
sorting_key_expr_ast = std::move(new_sorting_key_expr_list);
sorting_key_expr = std::move(new_sorting_key_expr);
primary_key_ast = metadata.primary_key_ast;
primary_key_columns = std::move(new_primary_key_columns);
primary_key_expr_ast = std::move(new_primary_key_expr_list);
primary_key_expr = std::move(new_primary_key_expr);
primary_key_sample = std::move(new_primary_key_sample);
primary_key_data_types = std::move(new_primary_key_data_types);
setIndices(metadata.indices);
skip_indices = std::move(new_indices);
setConstraints(metadata.constraints);
primary_key_and_skip_indices_expr = new_indices_with_primary_key_expr;
sorting_key_and_skip_indices_expr = new_indices_with_sorting_key_expr;
}
}
ASTPtr MergeTreeData::extractKeyExpressionList(const ASTPtr & node)
{
if (!node)
return std::make_shared<ASTExpressionList>();
const auto * expr_func = node->as<ASTFunction>();
if (expr_func && expr_func->name == "tuple")
{
/// Primary key is specified in tuple, extract its arguments.
return expr_func->arguments->clone();
}
else
{
/// Primary key consists of one column.
auto res = std::make_shared<ASTExpressionList>();
res->children.push_back(node);
return res;
}
}
void MergeTreeData::initPartitionKey()
{
ASTPtr partition_key_expr_list = extractKeyExpressionList(partition_by_ast);
if (partition_key_expr_list->children.empty())
return;
{
auto syntax_result = SyntaxAnalyzer(global_context).analyze(partition_key_expr_list, getColumns().getAllPhysical());
partition_key_expr = ExpressionAnalyzer(partition_key_expr_list, syntax_result, global_context).getActions(false);
}
for (const ASTPtr & ast : partition_key_expr_list->children)
{
String col_name = ast->getColumnName();
partition_key_sample.insert(partition_key_expr->getSampleBlock().getByName(col_name));
}
checkKeyExpression(*partition_key_expr, partition_key_sample, "Partition");
/// Add all columns used in the partition key to the min-max index.
const NamesAndTypesList & minmax_idx_columns_with_types = partition_key_expr->getRequiredColumnsWithTypes();
minmax_idx_expr = std::make_shared<ExpressionActions>(minmax_idx_columns_with_types, global_context);
for (const NameAndTypePair & column : minmax_idx_columns_with_types)
{
minmax_idx_columns.emplace_back(column.name);
minmax_idx_column_types.emplace_back(column.type);
}
/// Try to find the date column in columns used by the partition key (a common case).
bool encountered_date_column = false;
for (size_t i = 0; i < minmax_idx_column_types.size(); ++i)
{
if (typeid_cast<const DataTypeDate *>(minmax_idx_column_types[i].get()))
{
if (!encountered_date_column)
{
minmax_idx_date_column_pos = i;
encountered_date_column = true;
}
else
{
/// There is more than one Date column in partition key and we don't know which one to choose.
minmax_idx_date_column_pos = -1;
}
}
}
if (!encountered_date_column)
{
for (size_t i = 0; i < minmax_idx_column_types.size(); ++i)
{
if (typeid_cast<const DataTypeDateTime *>(minmax_idx_column_types[i].get()))
{
if (!encountered_date_column)
{
minmax_idx_time_column_pos = i;
encountered_date_column = true;
}
else
{
/// There is more than one DateTime column in partition key and we don't know which one to choose.
minmax_idx_time_column_pos = -1;
}
}
}
}
}
namespace
{
void checkTTLExpression(const ExpressionActionsPtr & ttl_expression, const String & result_column_name)
{
for (const auto & action : ttl_expression->getActions())
{
if (action.type == ExpressionAction::APPLY_FUNCTION)
{
IFunctionBase & func = *action.function_base;
if (!func.isDeterministic())
throw Exception("TTL expression cannot contain non-deterministic functions, "
"but contains function " + func.getName(), ErrorCodes::BAD_ARGUMENTS);
}
}
const auto & result_column = ttl_expression->getSampleBlock().getByName(result_column_name);
if (!typeid_cast<const DataTypeDateTime *>(result_column.type.get())
&& !typeid_cast<const DataTypeDate *>(result_column.type.get()))
{
throw Exception("TTL expression result column should have DateTime or Date type, but has "
+ result_column.type->getName(), ErrorCodes::BAD_TTL_EXPRESSION);
}
}
}
void MergeTreeData::setTTLExpressions(const ColumnsDescription & new_columns,
const ASTPtr & new_ttl_table_ast, bool only_check)
{
auto new_column_ttls = new_columns.getColumnTTLs();
auto create_ttl_entry = [this, &new_columns](ASTPtr ttl_ast)
{
TTLEntry result;
auto syntax_result = SyntaxAnalyzer(global_context).analyze(ttl_ast, new_columns.getAllPhysical());
result.expression = ExpressionAnalyzer(ttl_ast, syntax_result, global_context).getActions(false);
result.destination_type = PartDestinationType::DELETE;
result.result_column = ttl_ast->getColumnName();
checkTTLExpression(result.expression, result.result_column);
return result;
};
if (!new_column_ttls.empty())
{
NameSet columns_ttl_forbidden;
if (partition_key_expr)
for (const auto & col : partition_key_expr->getRequiredColumns())
columns_ttl_forbidden.insert(col);
if (sorting_key_expr)
for (const auto & col : sorting_key_expr->getRequiredColumns())
columns_ttl_forbidden.insert(col);
for (const auto & [name, ast] : new_column_ttls)
{
if (columns_ttl_forbidden.count(name))
throw Exception("Trying to set TTL for key column " + name, ErrorCodes::ILLEGAL_COLUMN);
else
{
auto new_ttl_entry = create_ttl_entry(ast);
if (!only_check)
column_ttl_entries_by_name[name] = new_ttl_entry;
}
}
}
if (new_ttl_table_ast)
{
std::vector<TTLEntry> update_move_ttl_entries;
TTLEntry update_rows_ttl_entry;
bool seen_delete_ttl = false;
for (const auto & ttl_element_ptr : new_ttl_table_ast->children)
{
const auto * ttl_element = ttl_element_ptr->as<ASTTTLElement>();
if (!ttl_element)
throw Exception("Unexpected AST element in TTL expression", ErrorCodes::UNEXPECTED_AST_STRUCTURE);
if (ttl_element->destination_type == PartDestinationType::DELETE)
{
if (seen_delete_ttl)
{
throw Exception("More than one DELETE TTL expression is not allowed", ErrorCodes::BAD_TTL_EXPRESSION);
}
auto new_rows_ttl_entry = create_ttl_entry(ttl_element->children[0]);
if (!only_check)
update_rows_ttl_entry = new_rows_ttl_entry;
seen_delete_ttl = true;
}
else
{
auto new_ttl_entry = create_ttl_entry(ttl_element->children[0]);
new_ttl_entry.entry_ast = ttl_element_ptr;
new_ttl_entry.destination_type = ttl_element->destination_type;
new_ttl_entry.destination_name = ttl_element->destination_name;
if (!new_ttl_entry.getDestination(getStoragePolicy()))
{
String message;
if (new_ttl_entry.destination_type == PartDestinationType::DISK)
message = "No such disk " + backQuote(new_ttl_entry.destination_name) + " for given storage policy.";
else
message = "No such volume " + backQuote(new_ttl_entry.destination_name) + " for given storage policy.";
throw Exception(message, ErrorCodes::BAD_TTL_EXPRESSION);
}
if (!only_check)
update_move_ttl_entries.emplace_back(std::move(new_ttl_entry));
}
}
if (!only_check)
{
rows_ttl_entry = update_rows_ttl_entry;
ttl_table_ast = new_ttl_table_ast;
auto move_ttl_entries_lock = std::lock_guard<std::mutex>(move_ttl_entries_mutex);
move_ttl_entries = update_move_ttl_entries;
}
}
}
void MergeTreeData::checkStoragePolicy(const StoragePolicyPtr & new_storage_policy) const
{
const auto old_storage_policy = getStoragePolicy();
old_storage_policy->checkCompatibleWith(new_storage_policy);
}
void MergeTreeData::MergingParams::check(const NamesAndTypesList & columns) const
{
if (!sign_column.empty() && mode != MergingParams::Collapsing && mode != MergingParams::VersionedCollapsing)
throw Exception("Sign column for MergeTree cannot be specified in modes except Collapsing or VersionedCollapsing.",
ErrorCodes::LOGICAL_ERROR);
if (!version_column.empty() && mode != MergingParams::Replacing && mode != MergingParams::VersionedCollapsing)
throw Exception("Version column for MergeTree cannot be specified in modes except Replacing or VersionedCollapsing.",
ErrorCodes::LOGICAL_ERROR);
if (!columns_to_sum.empty() && mode != MergingParams::Summing)
throw Exception("List of columns to sum for MergeTree cannot be specified in all modes except Summing.",
ErrorCodes::LOGICAL_ERROR);
/// Check that if the sign column is needed, it exists and is of type Int8.
auto check_sign_column = [this, & columns](bool is_optional, const std::string & storage)
{
if (sign_column.empty())
{
if (is_optional)
return;
throw Exception("Logical error: Sign column for storage " + storage + " is empty", ErrorCodes::LOGICAL_ERROR);
}
bool miss_column = true;
for (const auto & column : columns)
{
if (column.name == sign_column)
{
if (!typeid_cast<const DataTypeInt8 *>(column.type.get()))
throw Exception("Sign column (" + sign_column + ") for storage " + storage + " must have type Int8."
" Provided column of type " + column.type->getName() + ".", ErrorCodes::BAD_TYPE_OF_FIELD);
miss_column = false;
break;
}
}
if (miss_column)
throw Exception("Sign column " + sign_column + " does not exist in table declaration.", ErrorCodes::NO_SUCH_COLUMN_IN_TABLE);
};
/// that if the version_column column is needed, it exists and is of unsigned integer type.
auto check_version_column = [this, & columns](bool is_optional, const std::string & storage)
{
if (version_column.empty())
{
if (is_optional)
return;
throw Exception("Logical error: Version column for storage " + storage + " is empty", ErrorCodes::LOGICAL_ERROR);
}
bool miss_column = true;
for (const auto & column : columns)
{
if (column.name == version_column)
{
if (!column.type->canBeUsedAsVersion())
throw Exception("The column " + version_column +
" cannot be used as a version column for storage " + storage +
" because it is of type " + column.type->getName() +
" (must be of an integer type or of type Date or DateTime)", ErrorCodes::BAD_TYPE_OF_FIELD);
miss_column = false;
break;
}
}
if (miss_column)
throw Exception("Version column " + version_column + " does not exist in table declaration.", ErrorCodes::NO_SUCH_COLUMN_IN_TABLE);
};
if (mode == MergingParams::Collapsing)
check_sign_column(false, "CollapsingMergeTree");
if (mode == MergingParams::Summing)
{
/// If columns_to_sum are set, then check that such columns exist.
for (const auto & column_to_sum : columns_to_sum)
{
auto check_column_to_sum_exists = [& column_to_sum](const NameAndTypePair & name_and_type)
{
return column_to_sum == Nested::extractTableName(name_and_type.name);
};
if (columns.end() == std::find_if(columns.begin(), columns.end(), check_column_to_sum_exists))
throw Exception(
"Column " + column_to_sum + " listed in columns to sum does not exist in table declaration.", ErrorCodes::NO_SUCH_COLUMN_IN_TABLE);
}
}
if (mode == MergingParams::Replacing)
check_version_column(true, "ReplacingMergeTree");
if (mode == MergingParams::VersionedCollapsing)
{
check_sign_column(false, "VersionedCollapsingMergeTree");
check_version_column(false, "VersionedCollapsingMergeTree");
}
/// TODO Checks for Graphite mode.
}
String MergeTreeData::MergingParams::getModeName() const
{
switch (mode)
{
case Ordinary: return "";
case Collapsing: return "Collapsing";
case Summing: return "Summing";
case Aggregating: return "Aggregating";
case Replacing: return "Replacing";
case Graphite: return "Graphite";
case VersionedCollapsing: return "VersionedCollapsing";
}
__builtin_unreachable();
}
Int64 MergeTreeData::getMaxBlockNumber() const
{
auto lock = lockParts();
Int64 max_block_num = 0;
for (const DataPartPtr & part : data_parts_by_info)
max_block_num = std::max({max_block_num, part->info.max_block, part->info.mutation});
return max_block_num;
}
void MergeTreeData::loadDataParts(bool skip_sanity_checks)
{
LOG_DEBUG(log, "Loading data parts");
const auto settings = getSettings();
std::vector<std::pair<String, DiskPtr>> part_names_with_disks;
MutableDataPartsVector parts_from_wal;
Strings part_file_names;
auto disks = getStoragePolicy()->getDisks();
/// Only check if user did touch storage configuration for this table.
if (!getStoragePolicy()->isDefaultPolicy() && !skip_sanity_checks)
{
/// Check extra parts at different disks, in order to not allow to miss data parts at undefined disks.
std::unordered_set<String> defined_disk_names;
for (const auto & disk_ptr : disks)
defined_disk_names.insert(disk_ptr->getName());
for (const auto & [disk_name, disk] : global_context.getDiskSelector()->getDisksMap())
{
if (defined_disk_names.count(disk_name) == 0 && disk->exists(relative_data_path))
{
for (const auto it = disk->iterateDirectory(relative_data_path); it->isValid(); it->next())
{
MergeTreePartInfo part_info;
if (MergeTreePartInfo::tryParsePartName(it->name(), &part_info, format_version))
throw Exception("Part " + backQuote(it->name()) + " was found on disk " + backQuote(disk_name) + " which is not defined in the storage policy", ErrorCodes::UNKNOWN_DISK);
}
}
}
}
/// Reversed order to load part from low priority disks firstly.
/// Used for keep part on low priority disk if duplication found
for (auto disk_it = disks.rbegin(); disk_it != disks.rend(); ++disk_it)
{
auto disk_ptr = *disk_it;
for (auto it = disk_ptr->iterateDirectory(relative_data_path); it->isValid(); it->next())
{
/// Skip temporary directories.
if (startsWith(it->name(), "tmp"))
continue;
part_names_with_disks.emplace_back(it->name(), disk_ptr);
if (startsWith(it->name(), MergeTreeWriteAheadLog::WAL_FILE_NAME))
{
MergeTreeWriteAheadLog wal(*this, disk_ptr, it->name());
auto current_parts = wal.restore();
for (auto & part : current_parts)
parts_from_wal.push_back(std::move(part));
}
}
}
auto part_lock = lockParts();
data_parts_indexes.clear();
if (part_names_with_disks.empty() && parts_from_wal.empty())
{
LOG_DEBUG(log, "There is no data parts");
return;
}
/// Parallel loading of data parts.
size_t num_threads = std::min(size_t(settings->max_part_loading_threads), part_names_with_disks.size());
std::mutex mutex;
DataPartsVector broken_parts_to_remove;
DataPartsVector broken_parts_to_detach;
size_t suspicious_broken_parts = 0;
std::atomic<bool> has_adaptive_parts = false;
std::atomic<bool> has_non_adaptive_parts = false;
ThreadPool pool(num_threads);
for (size_t i = 0; i < part_names_with_disks.size(); ++i)
{
pool.scheduleOrThrowOnError([&, i]
{
const auto & part_name = part_names_with_disks[i].first;
const auto part_disk_ptr = part_names_with_disks[i].second;
MergeTreePartInfo part_info;
if (!MergeTreePartInfo::tryParsePartName(part_name, &part_info, format_version))
return;
auto part = createPart(part_name, part_info, part_disk_ptr, part_name);
bool broken = false;
String part_path = relative_data_path + "/" + part_name;
String marker_path = part_path + "/" + DELETE_ON_DESTROY_MARKER_PATH;
if (part_disk_ptr->exists(marker_path))
{
LOG_WARNING(log, "Detaching stale part " << getFullPathOnDisk(part_disk_ptr) << part_name << ", which should have been deleted after a move. That can only happen after unclean restart of ClickHouse after move of a part having an operation blocking that stale copy of part.");
std::lock_guard loading_lock(mutex);
broken_parts_to_detach.push_back(part);
++suspicious_broken_parts;
return;
}
try
{
part->loadColumnsChecksumsIndexes(require_part_metadata, true);
}
catch (const Exception & e)
{
/// Don't count the part as broken if there is not enough memory to load it.
/// In fact, there can be many similar situations.
/// But it is OK, because there is a safety guard against deleting too many parts.
if (isNotEnoughMemoryErrorCode(e.code()))
throw;
broken = true;
tryLogCurrentException(__PRETTY_FUNCTION__);
}
catch (...)
{
broken = true;
tryLogCurrentException(__PRETTY_FUNCTION__);
}
/// Ignore and possibly delete broken parts that can appear as a result of hard server restart.
if (broken)
{
if (part->info.level == 0)
{
/// It is impossible to restore level 0 parts.
LOG_ERROR(log, "Considering to remove broken part " << getFullPathOnDisk(part_disk_ptr) << part_name << " because it's impossible to repair.");
std::lock_guard loading_lock(mutex);
broken_parts_to_remove.push_back(part);
}
else
{
/// Count the number of parts covered by the broken part. If it is at least two, assume that
/// the broken part was created as a result of merging them and we won't lose data if we
/// delete it.
size_t contained_parts = 0;
LOG_ERROR(log, "Part " << getFullPathOnDisk(part_disk_ptr) << part_name << " is broken. Looking for parts to replace it.");
for (const auto & [contained_name, contained_disk_ptr] : part_names_with_disks)
{
if (contained_name == part_name)
continue;
MergeTreePartInfo contained_part_info;
if (!MergeTreePartInfo::tryParsePartName(contained_name, &contained_part_info, format_version))
continue;
if (part->info.contains(contained_part_info))
{
LOG_ERROR(log, "Found part " << getFullPathOnDisk(contained_disk_ptr) << contained_name);
++contained_parts;
}
}
if (contained_parts >= 2)
{
LOG_ERROR(log, "Considering to remove broken part " << getFullPathOnDisk(part_disk_ptr) << part_name << " because it covers at least 2 other parts");
std::lock_guard loading_lock(mutex);
broken_parts_to_remove.push_back(part);
}
else
{
LOG_ERROR(log, "Detaching broken part " << getFullPathOnDisk(part_disk_ptr) << part_name
<< " because it covers less than 2 parts. You need to resolve this manually");
std::lock_guard loading_lock(mutex);
broken_parts_to_detach.push_back(part);
++suspicious_broken_parts;
}
}
return;
}
if (!part->index_granularity_info.is_adaptive)
has_non_adaptive_parts.store(true, std::memory_order_relaxed);
else
has_adaptive_parts.store(true, std::memory_order_relaxed);
part->modification_time = part_disk_ptr->getLastModified(relative_data_path + part_name).epochTime();
/// Assume that all parts are Committed, covered parts will be detected and marked as Outdated later
part->state = DataPartState::Committed;
std::lock_guard loading_lock(mutex);
if (!data_parts_indexes.insert(part).second)
throw Exception("Part " + part->name + " already exists", ErrorCodes::DUPLICATE_DATA_PART);
});
}
pool.wait();
for (auto & part : parts_from_wal)
{
part->modification_time = time(nullptr);
/// Assume that all parts are Committed, covered parts will be detected and marked as Outdated later
part->state = DataPartState::Committed;
if (!data_parts_indexes.insert(part).second)
throw Exception("Part " + part->name + " already exists", ErrorCodes::DUPLICATE_DATA_PART);
}
if (has_non_adaptive_parts && has_adaptive_parts && !settings->enable_mixed_granularity_parts)
throw Exception("Table contains parts with adaptive and non adaptive marks, but `setting enable_mixed_granularity_parts` is disabled", ErrorCodes::LOGICAL_ERROR);
has_non_adaptive_index_granularity_parts = has_non_adaptive_parts;
if (suspicious_broken_parts > settings->max_suspicious_broken_parts && !skip_sanity_checks)
throw Exception("Suspiciously many (" + toString(suspicious_broken_parts) + ") broken parts to remove.",
ErrorCodes::TOO_MANY_UNEXPECTED_DATA_PARTS);
for (auto & part : broken_parts_to_remove)
part->remove();
for (auto & part : broken_parts_to_detach)
part->renameToDetached("");
/// Delete from the set of current parts those parts that are covered by another part (those parts that
/// were merged), but that for some reason are still not deleted from the filesystem.
/// Deletion of files will be performed later in the clearOldParts() method.
if (data_parts_indexes.size() >= 2)
{
/// Now all parts are committed, so data_parts_by_state_and_info == committed_parts_range
auto prev_jt = data_parts_by_state_and_info.begin();
auto curr_jt = std::next(prev_jt);
auto deactivate_part = [&] (DataPartIteratorByStateAndInfo it)
{
(*it)->remove_time.store((*it)->modification_time, std::memory_order_relaxed);
modifyPartState(it, DataPartState::Outdated);
};
(*prev_jt)->assertState({DataPartState::Committed});
while (curr_jt != data_parts_by_state_and_info.end() && (*curr_jt)->state == DataPartState::Committed)
{
/// Don't consider data parts belonging to different partitions.
if ((*curr_jt)->info.partition_id != (*prev_jt)->info.partition_id)
{
++prev_jt;
++curr_jt;
continue;
}
if ((*curr_jt)->contains(**prev_jt))
{
deactivate_part(prev_jt);
prev_jt = curr_jt;
++curr_jt;
}
else if ((*prev_jt)->contains(**curr_jt))
{
auto next = std::next(curr_jt);
deactivate_part(curr_jt);
curr_jt = next;
}
else
{
++prev_jt;
++curr_jt;
}
}
}
if (settings->in_memory_parts_enable_wal)
{
auto disk = makeEmptyReservationOnLargestDisk()->getDisk();
write_ahead_log = std::make_shared<MergeTreeWriteAheadLog>(*this, std::move(disk));
}
calculateColumnSizesImpl();
LOG_DEBUG(log, "Loaded data parts (" << data_parts_indexes.size() << " items)");
}
/// Is the part directory old.
/// True if its modification time and the modification time of all files inside it is less then threshold.
/// (Only files on the first level of nesting are considered).
static bool isOldPartDirectory(const DiskPtr & disk, const String & directory_path, time_t threshold)
{
if (disk->getLastModified(directory_path).epochTime() >= threshold)
return false;
for (auto it = disk->iterateDirectory(directory_path); it->isValid(); it->next())
if (disk->getLastModified(it->path()).epochTime() >= threshold)
return false;
return true;
}
void MergeTreeData::clearOldTemporaryDirectories(ssize_t custom_directories_lifetime_seconds)
{
/// If the method is already called from another thread, then we don't need to do anything.
std::unique_lock lock(clear_old_temporary_directories_mutex, std::defer_lock);
if (!lock.try_lock())
return;
const auto settings = getSettings();
time_t current_time = time(nullptr);
ssize_t deadline = (custom_directories_lifetime_seconds >= 0)
? current_time - custom_directories_lifetime_seconds
: current_time - settings->temporary_directories_lifetime.totalSeconds();
/// Delete temporary directories older than a day.
for (const auto & [path, disk] : getRelativeDataPathsWithDisks())
{
for (auto it = disk->iterateDirectory(path); it->isValid(); it->next())
{
if (startsWith(it->name(), "tmp_"))
{
try
{
if (disk->isDirectory(it->path()) && isOldPartDirectory(disk, it->path(), deadline))
{
LOG_WARNING(log, "Removing temporary directory " << fullPath(disk, it->path()));
disk->removeRecursive(it->path());
}
}
catch (const Poco::FileNotFoundException &)
{
/// If the file is already deleted, do nothing.
}
}
}
}
}
MergeTreeData::DataPartsVector MergeTreeData::grabOldParts(bool force)
{
DataPartsVector res;
/// If the method is already called from another thread, then we don't need to do anything.
std::unique_lock lock(grab_old_parts_mutex, std::defer_lock);
if (!lock.try_lock())
return res;
time_t now = time(nullptr);
std::vector<DataPartIteratorByStateAndInfo> parts_to_delete;
{
auto parts_lock = lockParts();
auto outdated_parts_range = getDataPartsStateRange(DataPartState::Outdated);
for (auto it = outdated_parts_range.begin(); it != outdated_parts_range.end(); ++it)
{
const DataPartPtr & part = *it;
auto part_remove_time = part->remove_time.load(std::memory_order_relaxed);
if (part.unique() && /// Grab only parts that are not used by anyone (SELECTs for example).
((part_remove_time < now &&
now - part_remove_time > getSettings()->old_parts_lifetime.totalSeconds()) || force))
{
parts_to_delete.emplace_back(it);
}
}
res.reserve(parts_to_delete.size());
for (const auto & it_to_delete : parts_to_delete)
{
res.emplace_back(*it_to_delete);
modifyPartState(it_to_delete, DataPartState::Deleting);
}
}
if (!res.empty())
LOG_TRACE(log, "Found " << res.size() << " old parts to remove.");
return res;
}
void MergeTreeData::rollbackDeletingParts(const MergeTreeData::DataPartsVector & parts)
{
auto lock = lockParts();
for (const auto & part : parts)
{
/// We should modify it under data_parts_mutex
part->assertState({DataPartState::Deleting});
modifyPartState(part, DataPartState::Outdated);
}
}
void MergeTreeData::removePartsFinally(const MergeTreeData::DataPartsVector & parts)
{
{
auto lock = lockParts();
/// TODO: use data_parts iterators instead of pointers
for (const auto & part : parts)
{
auto it = data_parts_by_info.find(part->info);
if (it == data_parts_by_info.end())
throw Exception("Deleting data part " + part->name + " doesn't exist", ErrorCodes::LOGICAL_ERROR);
(*it)->assertState({DataPartState::Deleting});
data_parts_indexes.erase(it);
}
}
/// Data parts is still alive (since DataPartsVector holds shared_ptrs) and contain useful metainformation for logging
/// NOTE: There is no need to log parts deletion somewhere else, all deleting parts pass through this function and pass away
auto table_id = getStorageID();
if (auto part_log = global_context.getPartLog(table_id.database_name))
{
PartLogElement part_log_elem;
part_log_elem.event_type = PartLogElement::REMOVE_PART;
part_log_elem.event_time = time(nullptr);
part_log_elem.duration_ms = 0;
part_log_elem.database_name = table_id.database_name;
part_log_elem.table_name = table_id.table_name;
for (const auto & part : parts)
{
part_log_elem.partition_id = part->info.partition_id;
part_log_elem.part_name = part->name;
part_log_elem.bytes_compressed_on_disk = part->getBytesOnDisk();
part_log_elem.rows = part->rows_count;
part_log->add(part_log_elem);
}
}
}
void MergeTreeData::clearOldPartsFromFilesystem(bool force)
{
DataPartsVector parts_to_remove = grabOldParts(force);
clearPartsFromFilesystem(parts_to_remove);
removePartsFinally(parts_to_remove);
}
void MergeTreeData::clearPartsFromFilesystem(const DataPartsVector & parts_to_remove)
{
const auto settings = getSettings();
if (parts_to_remove.size() > 1 && settings->max_part_removal_threads > 1 && parts_to_remove.size() > settings->concurrent_part_removal_threshold)
{
/// Parallel parts removal.
size_t num_threads = std::min(size_t(settings->max_part_removal_threads), parts_to_remove.size());
ThreadPool pool(num_threads);
/// NOTE: Under heavy system load you may get "Cannot schedule a task" from ThreadPool.
for (const DataPartPtr & part : parts_to_remove)
{
pool.scheduleOrThrowOnError([&]
{
LOG_DEBUG(log, "Removing part from filesystem " << part->name);
part->remove();
});
}
pool.wait();
}
else
{
for (const DataPartPtr & part : parts_to_remove)
{
LOG_DEBUG(log, "Removing part from filesystem " << part->name);
part->remove();
}
}
}
void MergeTreeData::rename(const String & new_table_path, const StorageID & new_table_id)
{
auto disks = getStoragePolicy()->getDisks();
for (const auto & disk : disks)
{
if (disk->exists(new_table_path))
throw Exception{"Target path already exists: " + fullPath(disk, new_table_path), ErrorCodes::DIRECTORY_ALREADY_EXISTS};
}
for (const auto & disk : disks)
{
auto new_table_path_parent = parentPath(new_table_path);
disk->createDirectories(new_table_path_parent);
disk->moveDirectory(relative_data_path, new_table_path);
}
global_context.dropCaches();
relative_data_path = new_table_path;
renameInMemory(new_table_id);
}
void MergeTreeData::dropAllData()
{
LOG_TRACE(log, "dropAllData: waiting for locks.");
auto lock = lockParts();
LOG_TRACE(log, "dropAllData: removing data from memory.");
DataPartsVector all_parts(data_parts_by_info.begin(), data_parts_by_info.end());
data_parts_indexes.clear();
column_sizes.clear();
global_context.dropCaches();
LOG_TRACE(log, "dropAllData: removing data from filesystem.");
/// Removing of each data part before recursive removal of directory is to speed-up removal, because there will be less number of syscalls.
clearPartsFromFilesystem(all_parts);
for (const auto & [path, disk] : getRelativeDataPathsWithDisks())
disk->removeRecursive(path);
LOG_TRACE(log, "dropAllData: done.");
}
namespace
{
/// If true, then in order to ALTER the type of the column from the type from to the type to
/// we don't need to rewrite the data, we only need to update metadata and columns.txt in part directories.
/// The function works for Arrays and Nullables of the same structure.
bool isMetadataOnlyConversion(const IDataType * from, const IDataType * to)
{
if (from->getName() == to->getName())
return true;
static const std::unordered_multimap<std::type_index, const std::type_info &> ALLOWED_CONVERSIONS =
{
{ typeid(DataTypeEnum8), typeid(DataTypeEnum8) },
{ typeid(DataTypeEnum8), typeid(DataTypeInt8) },
{ typeid(DataTypeEnum16), typeid(DataTypeEnum16) },
{ typeid(DataTypeEnum16), typeid(DataTypeInt16) },
{ typeid(DataTypeDateTime), typeid(DataTypeUInt32) },
{ typeid(DataTypeUInt32), typeid(DataTypeDateTime) },
{ typeid(DataTypeDate), typeid(DataTypeUInt16) },
{ typeid(DataTypeUInt16), typeid(DataTypeDate) },
};
while (true)
{
auto it_range = ALLOWED_CONVERSIONS.equal_range(typeid(*from));
for (auto it = it_range.first; it != it_range.second; ++it)
{
if (it->second == typeid(*to))
return true;
}
const auto * arr_from = typeid_cast<const DataTypeArray *>(from);
const auto * arr_to = typeid_cast<const DataTypeArray *>(to);
if (arr_from && arr_to)
{
from = arr_from->getNestedType().get();
to = arr_to->getNestedType().get();
continue;
}
const auto * nullable_from = typeid_cast<const DataTypeNullable *>(from);
const auto * nullable_to = typeid_cast<const DataTypeNullable *>(to);
if (nullable_from && nullable_to)
{
from = nullable_from->getNestedType().get();
to = nullable_to->getNestedType().get();
continue;
}
return false;
}
}
}
void MergeTreeData::checkAlterIsPossible(const AlterCommands & commands, const Settings & settings)
{
/// Check that needed transformations can be applied to the list of columns without considering type conversions.
StorageInMemoryMetadata metadata = getInMemoryMetadata();
commands.apply(metadata);
if (getIndices().empty() && !metadata.indices.empty() &&
!settings.allow_experimental_data_skipping_indices)
throw Exception("You must set the setting `allow_experimental_data_skipping_indices` to 1 " \
"before using data skipping indices.", ErrorCodes::BAD_ARGUMENTS);
/// Set of columns that shouldn't be altered.
NameSet columns_alter_type_forbidden;
/// Primary key columns can be ALTERed only if they are used in the key as-is
/// (and not as a part of some expression) and if the ALTER only affects column metadata.
NameSet columns_alter_type_metadata_only;
if (partition_key_expr)
{
/// Forbid altering partition key columns because it can change partition ID format.
/// TODO: in some cases (e.g. adding an Enum value) a partition key column can still be ALTERed.
/// We should allow it.
for (const String & col : partition_key_expr->getRequiredColumns())
columns_alter_type_forbidden.insert(col);
}
for (const auto & index : skip_indices)
{
for (const String & col : index->expr->getRequiredColumns())
columns_alter_type_forbidden.insert(col);
}
if (sorting_key_expr)
{
for (const ExpressionAction & action : sorting_key_expr->getActions())
{
auto action_columns = action.getNeededColumns();
columns_alter_type_forbidden.insert(action_columns.begin(), action_columns.end());
}
for (const String & col : sorting_key_expr->getRequiredColumns())
columns_alter_type_metadata_only.insert(col);
/// We don't process sample_by_ast separately because it must be among the primary key columns
/// and we don't process primary_key_expr separately because it is a prefix of sorting_key_expr.
}
if (!merging_params.sign_column.empty())
columns_alter_type_forbidden.insert(merging_params.sign_column);
std::map<String, const IDataType *> old_types;
for (const auto & column : getColumns().getAllPhysical())
old_types.emplace(column.name, column.type.get());
for (const AlterCommand & command : commands)
{
if (command.type == AlterCommand::MODIFY_ORDER_BY && !is_custom_partitioned)
{
throw Exception(
"ALTER MODIFY ORDER BY is not supported for default-partitioned tables created with the old syntax",
ErrorCodes::BAD_ARGUMENTS);
}
if (command.type == AlterCommand::ADD_INDEX && !is_custom_partitioned)
{
throw Exception(
"ALTER ADD INDEX is not supported for tables with the old syntax",
ErrorCodes::BAD_ARGUMENTS);
}
if (command.type == AlterCommand::RENAME_COLUMN)
{
if (columns_alter_type_forbidden.count(command.column_name) || columns_alter_type_metadata_only.count(command.column_name))
{
throw Exception(
"Trying to ALTER RENAME key " + backQuoteIfNeed(command.column_name) + " column which is a part of key expression",
ErrorCodes::ILLEGAL_COLUMN);
}
}
else if (command.isModifyingData(getInMemoryMetadata()))
{
if (columns_alter_type_forbidden.count(command.column_name))
throw Exception("Trying to ALTER key column " + command.column_name, ErrorCodes::ILLEGAL_COLUMN);
if (columns_alter_type_metadata_only.count(command.column_name))
{
if (command.type == AlterCommand::MODIFY_COLUMN)
{
auto it = old_types.find(command.column_name);
if (it == old_types.end() || !isMetadataOnlyConversion(it->second, command.data_type.get()))
throw Exception("ALTER of key column " + command.column_name + " must be metadata-only", ErrorCodes::ILLEGAL_COLUMN);
}
}
}
}
setProperties(metadata, /* only_check = */ true);
setTTLExpressions(metadata.columns, metadata.ttl_for_table_ast, /* only_check = */ true);
if (settings_ast)
{
const auto & current_changes = settings_ast->as<const ASTSetQuery &>().changes;
const auto & new_changes = metadata.settings_ast->as<const ASTSetQuery &>().changes;
for (const auto & changed_setting : new_changes)
{
if (MergeTreeSettings::findIndex(changed_setting.name) == MergeTreeSettings::npos)
throw Exception{"Storage '" + getName() + "' doesn't have setting '" + changed_setting.name + "'",
ErrorCodes::UNKNOWN_SETTING};
auto comparator = [&changed_setting](const auto & change) { return change.name == changed_setting.name; };
auto current_setting_it
= std::find_if(current_changes.begin(), current_changes.end(), comparator);
if ((current_setting_it == current_changes.end() || *current_setting_it != changed_setting)
&& MergeTreeSettings::isReadonlySetting(changed_setting.name))
{
throw Exception{"Setting '" + changed_setting.name + "' is readonly for storage '" + getName() + "'",
ErrorCodes::READONLY_SETTING};
}
if (current_setting_it == current_changes.end()
&& MergeTreeSettings::isPartFormatSetting(changed_setting.name))
{
MergeTreeSettings copy = *getSettings();
copy.applyChange(changed_setting);
String reason;
if (!canUsePolymorphicParts(copy, &reason) && !reason.empty())
throw Exception("Can't change settings. Reason: " + reason, ErrorCodes::NOT_IMPLEMENTED);
}
if (changed_setting.name == "storage_policy")
checkStoragePolicy(global_context.getStoragePolicy(changed_setting.value.safeGet<String>()));
}
}
}
MergeTreeDataPartType MergeTreeData::choosePartType(size_t bytes_uncompressed, size_t rows_count) const
{
if (!canUseAdaptiveGranularity())
return MergeTreeDataPartType::WIDE;
const auto settings = getSettings();
if (bytes_uncompressed < settings->min_bytes_for_compact_part || rows_count < settings->min_rows_for_compact_part)
return MergeTreeDataPartType::IN_MEMORY;
if (bytes_uncompressed < settings->min_bytes_for_wide_part || rows_count < settings->min_rows_for_wide_part)
return MergeTreeDataPartType::COMPACT;
return MergeTreeDataPartType::WIDE;
}
MergeTreeDataPartType MergeTreeData::choosePartTypeOnDisk(size_t bytes_uncompressed, size_t rows_count) const
{
if (!canUseAdaptiveGranularity())
return MergeTreeDataPartType::WIDE;
const auto settings = getSettings();
if (bytes_uncompressed < settings->min_bytes_for_wide_part || rows_count < settings->min_rows_for_wide_part)
return MergeTreeDataPartType::COMPACT;
return MergeTreeDataPartType::WIDE;
}
MergeTreeData::MutableDataPartPtr MergeTreeData::createPart(const String & name,
MergeTreeDataPartType type, const MergeTreePartInfo & part_info,
const DiskPtr & disk, const String & relative_path) const
{
if (type == MergeTreeDataPartType::COMPACT)
return std::make_shared<MergeTreeDataPartCompact>(*this, name, part_info, disk, relative_path);
else if (type == MergeTreeDataPartType::WIDE)
return std::make_shared<MergeTreeDataPartWide>(*this, name, part_info, disk, relative_path);
else if (type == MergeTreeDataPartType::IN_MEMORY)
return std::make_shared<MergeTreeDataPartInMemory>(*this, name, part_info, disk, relative_path);
else
throw Exception("Unknown type of part " + relative_path, ErrorCodes::UNKNOWN_PART_TYPE);
}
static MergeTreeDataPartType getPartTypeFromMarkExtension(const String & mrk_ext)
{
if (mrk_ext == getNonAdaptiveMrkExtension())
return MergeTreeDataPartType::WIDE;
if (mrk_ext == getAdaptiveMrkExtension(MergeTreeDataPartType::WIDE))
return MergeTreeDataPartType::WIDE;
if (mrk_ext == getAdaptiveMrkExtension(MergeTreeDataPartType::COMPACT))
return MergeTreeDataPartType::COMPACT;
throw Exception("Can't determine part type, because of unknown mark extension " + mrk_ext, ErrorCodes::UNKNOWN_PART_TYPE);
}
MergeTreeData::MutableDataPartPtr MergeTreeData::createPart(
const String & name, const DiskPtr & disk, const String & relative_path) const
{
return createPart(name, MergeTreePartInfo::fromPartName(name, format_version), disk, relative_path);
}
MergeTreeData::MutableDataPartPtr MergeTreeData::createPart(
const String & name, const MergeTreePartInfo & part_info,
const DiskPtr & disk, const String & relative_path) const
{
MergeTreeDataPartType type;
auto full_path = relative_data_path + relative_path + "/";
auto mrk_ext = MergeTreeIndexGranularityInfo::getMarksExtensionFromFilesystem(disk, full_path);
if (mrk_ext)
type = getPartTypeFromMarkExtension(*mrk_ext);
else
{
/// Didn't find any mark file, suppose that part is empty.
type = choosePartType(0, 0);
}
return createPart(name, type, part_info, disk, relative_path);
}
void MergeTreeData::changeSettings(
const ASTPtr & new_settings,
TableStructureWriteLockHolder & /* table_lock_holder */)
{
if (new_settings)
{
const auto & new_changes = new_settings->as<const ASTSetQuery &>().changes;
for (const auto & change : new_changes)
if (change.name == "storage_policy")
{
StoragePolicyPtr new_storage_policy = global_context.getStoragePolicy(change.value.safeGet<String>());
StoragePolicyPtr old_storage_policy = getStoragePolicy();
checkStoragePolicy(new_storage_policy);
std::unordered_set<String> all_diff_disk_names;
for (const auto & disk : new_storage_policy->getDisks())
all_diff_disk_names.insert(disk->getName());
for (const auto & disk : old_storage_policy->getDisks())
all_diff_disk_names.erase(disk->getName());
for (const String & disk_name : all_diff_disk_names)
{
auto disk = new_storage_policy->getDiskByName(disk_name);
if (disk->exists(relative_data_path))
throw Exception("New storage policy contain disks which already contain data of a table with the same name", ErrorCodes::LOGICAL_ERROR);
}
for (const String & disk_name : all_diff_disk_names)
{
auto disk = new_storage_policy->getDiskByName(disk_name);
disk->createDirectories(relative_data_path);
disk->createDirectories(relative_data_path + "detached");
}
/// FIXME how would that be done while reloading configuration???
}
MergeTreeSettings copy = *getSettings();
copy.applyChanges(new_changes);
storage_settings.set(std::make_unique<const MergeTreeSettings>(copy));
settings_ast = new_settings;
}
}
void MergeTreeData::freezeAll(const String & with_name, const Context & context, TableStructureReadLockHolder &)
{
freezePartitionsByMatcher([] (const DataPartPtr &){ return true; }, with_name, context);
}
void MergeTreeData::PartsTemporaryRename::addPart(const String & old_name, const String & new_name)
{
old_and_new_names.push_back({old_name, new_name});
for (const auto & [path, disk] : storage.getRelativeDataPathsWithDisks())
{
for (auto it = disk->iterateDirectory(path + source_dir); it->isValid(); it->next())
{
if (it->name() == old_name)
{
old_part_name_to_path_and_disk[old_name] = {path, disk};
break;
}
}
}
}
void MergeTreeData::PartsTemporaryRename::tryRenameAll()
{
renamed = true;
for (size_t i = 0; i < old_and_new_names.size(); ++i)
{
try
{
const auto & [old_name, new_name] = old_and_new_names[i];
if (old_name.empty() || new_name.empty())
throw DB::Exception("Empty part name. Most likely it's a bug.", ErrorCodes::INCORRECT_FILE_NAME);
const auto & [path, disk] = old_part_name_to_path_and_disk[old_name];
const auto full_path = path + source_dir; /// for old_name
disk->moveFile(full_path + old_name, full_path + new_name);
}
catch (...)
{
old_and_new_names.resize(i);
LOG_WARNING(storage.log, "Cannot rename parts to perform operation on them: " << getCurrentExceptionMessage(false));
throw;
}
}
}
MergeTreeData::PartsTemporaryRename::~PartsTemporaryRename()
{
// TODO what if server had crashed before this destructor was called?
if (!renamed)
return;
for (const auto & [old_name, new_name] : old_and_new_names)
{
if (old_name.empty())
continue;
try
{
const auto & [path, disk] = old_part_name_to_path_and_disk[old_name];
const auto full_path = path + source_dir; /// for old_name
disk->moveFile(full_path + new_name, full_path + old_name);
}
catch (...)
{
tryLogCurrentException(__PRETTY_FUNCTION__);
}
}
}
MergeTreeData::DataPartsVector MergeTreeData::getActivePartsToReplace(
const MergeTreePartInfo & new_part_info,
const String & new_part_name,
DataPartPtr & out_covering_part,
DataPartsLock & /* data_parts_lock */) const
{
/// Parts contained in the part are consecutive in data_parts, intersecting the insertion place for the part itself.
auto it_middle = data_parts_by_state_and_info.lower_bound(DataPartStateAndInfo{DataPartState::Committed, new_part_info});
auto committed_parts_range = getDataPartsStateRange(DataPartState::Committed);
/// Go to the left.
DataPartIteratorByStateAndInfo begin = it_middle;
while (begin != committed_parts_range.begin())
{
auto prev = std::prev(begin);
if (!new_part_info.contains((*prev)->info))
{
if ((*prev)->info.contains(new_part_info))
{
out_covering_part = *prev;
return {};
}
if (!new_part_info.isDisjoint((*prev)->info))
throw Exception("Part " + new_part_name + " intersects previous part " + (*prev)->getNameWithState() +
". It is a bug.", ErrorCodes::LOGICAL_ERROR);
break;
}
begin = prev;
}
/// Go to the right.
DataPartIteratorByStateAndInfo end = it_middle;
while (end != committed_parts_range.end())
{
if ((*end)->info == new_part_info)
throw Exception("Unexpected duplicate part " + (*end)->getNameWithState() + ". It is a bug.", ErrorCodes::LOGICAL_ERROR);
if (!new_part_info.contains((*end)->info))
{
if ((*end)->info.contains(new_part_info))
{
out_covering_part = *end;
return {};
}
if (!new_part_info.isDisjoint((*end)->info))
throw Exception("Part " + new_part_name + " intersects next part " + (*end)->getNameWithState() +
". It is a bug.", ErrorCodes::LOGICAL_ERROR);
break;
}
++end;
}
return DataPartsVector{begin, end};
}
void MergeTreeData::renameTempPartAndAdd(MutableDataPartPtr & part, SimpleIncrement * increment, Transaction * out_transaction)
{
auto removed = renameTempPartAndReplace(part, increment, out_transaction);
if (!removed.empty())
throw Exception("Added part " + part->name + " covers " + toString(removed.size())
+ " existing part(s) (including " + removed[0]->name + ")", ErrorCodes::LOGICAL_ERROR);
}
void MergeTreeData::renameTempPartAndReplace(
MutableDataPartPtr & part, SimpleIncrement * increment, Transaction * out_transaction,
std::unique_lock<std::mutex> & lock, DataPartsVector * out_covered_parts)
{
if (out_transaction && &out_transaction->data != this)
throw Exception("MergeTreeData::Transaction for one table cannot be used with another. It is a bug.",
ErrorCodes::LOGICAL_ERROR);
part->assertState({DataPartState::Temporary});
MergeTreePartInfo part_info = part->info;
String part_name;
if (DataPartPtr existing_part_in_partition = getAnyPartInPartition(part->info.partition_id, lock))
{
if (part->partition.value != existing_part_in_partition->partition.value)
throw Exception(
"Partition value mismatch between two parts with the same partition ID. Existing part: "
+ existing_part_in_partition->name + ", newly added part: " + part->name,
ErrorCodes::CORRUPTED_DATA);
}
/** It is important that obtaining new block number and adding that block to parts set is done atomically.
* Otherwise there is race condition - merge of blocks could happen in interval that doesn't yet contain new part.
*/
if (increment)
{
part_info.min_block = part_info.max_block = increment->get();
part_info.mutation = 0; /// it's equal to min_block by default
part_name = part->getNewName(part_info);
}
else
part_name = part->name;
LOG_TRACE(log, "Renaming temporary part " << part->relative_path << " to " << part_name << ".");
auto it_duplicate = data_parts_by_info.find(part_info);
if (it_duplicate != data_parts_by_info.end())
{
String message = "Part " + (*it_duplicate)->getNameWithState() + " already exists";
if ((*it_duplicate)->checkState({DataPartState::Outdated, DataPartState::Deleting}))
throw Exception(message + ", but it will be deleted soon", ErrorCodes::PART_IS_TEMPORARILY_LOCKED);
throw Exception(message, ErrorCodes::DUPLICATE_DATA_PART);
}
DataPartPtr covering_part;
DataPartsVector covered_parts = getActivePartsToReplace(part_info, part_name, covering_part, lock);
if (covering_part)
{
LOG_WARNING(log, "Tried to add obsolete part " << part_name << " covered by " << covering_part->getNameWithState());
return;
}
/// All checks are passed. Now we can rename the part on disk.
/// So, we maintain invariant: if a non-temporary part in filesystem then it is in data_parts
///
/// If out_transaction is null, we commit the part to the active set immediately, else add it to the transaction.
part->name = part_name;
part->info = part_info;
part->is_temp = false;
part->state = DataPartState::PreCommitted;
part->renameTo(part_name);
auto part_it = data_parts_indexes.insert(part).first;
if (out_transaction)
{
out_transaction->precommitted_parts.insert(part);
}
else
{
auto current_time = time(nullptr);
for (const DataPartPtr & covered_part : covered_parts)
{
covered_part->remove_time.store(current_time, std::memory_order_relaxed);
modifyPartState(covered_part, DataPartState::Outdated);
removePartContributionToColumnSizes(covered_part);
}
modifyPartState(part_it, DataPartState::Committed);
addPartContributionToColumnSizes(part);
}
auto * part_in_memory = dynamic_cast<MergeTreeDataPartInMemory *>(part.get());
if (part_in_memory && getSettings()->in_memory_parts_enable_wal)
{
auto wal = getWriteAheadLog();
wal->write(part_in_memory->block, part_in_memory->name);
}
if (out_covered_parts)
{
for (DataPartPtr & covered_part : covered_parts)
out_covered_parts->emplace_back(std::move(covered_part));
}
}
MergeTreeData::DataPartsVector MergeTreeData::renameTempPartAndReplace(
MutableDataPartPtr & part, SimpleIncrement * increment, Transaction * out_transaction)
{
if (out_transaction && &out_transaction->data != this)
throw Exception("MergeTreeData::Transaction for one table cannot be used with another. It is a bug.",
ErrorCodes::LOGICAL_ERROR);
DataPartsVector covered_parts;
{
auto lock = lockParts();
renameTempPartAndReplace(part, increment, out_transaction, lock, &covered_parts);
}
return covered_parts;
}
void MergeTreeData::removePartsFromWorkingSet(const MergeTreeData::DataPartsVector & remove, bool clear_without_timeout, DataPartsLock & /*acquired_lock*/)
{
auto remove_time = clear_without_timeout ? 0 : time(nullptr);
for (const DataPartPtr & part : remove)
{
if (part->state == IMergeTreeDataPart::State::Committed)
removePartContributionToColumnSizes(part);
if (part->state == IMergeTreeDataPart::State::Committed || clear_without_timeout)
part->remove_time.store(remove_time, std::memory_order_relaxed);
if (part->state != IMergeTreeDataPart::State::Outdated)
modifyPartState(part,IMergeTreeDataPart::State::Outdated);
}
}
void MergeTreeData::removePartsFromWorkingSet(const DataPartsVector & remove, bool clear_without_timeout, DataPartsLock * acquired_lock)
{
auto lock = (acquired_lock) ? DataPartsLock() : lockParts();
for (const auto & part : remove)
{
if (!data_parts_by_info.count(part->info))
throw Exception("Part " + part->getNameWithState() + " not found in data_parts", ErrorCodes::LOGICAL_ERROR);
part->assertState({DataPartState::PreCommitted, DataPartState::Committed, DataPartState::Outdated});
}
removePartsFromWorkingSet(remove, clear_without_timeout, lock);
}
MergeTreeData::DataPartsVector MergeTreeData::removePartsInRangeFromWorkingSet(const MergeTreePartInfo & drop_range, bool clear_without_timeout,
bool skip_intersecting_parts, DataPartsLock & lock)
{
DataPartsVector parts_to_remove;
if (drop_range.min_block > drop_range.max_block)
return parts_to_remove;
auto partition_range = getDataPartsPartitionRange(drop_range.partition_id);
for (const DataPartPtr & part : partition_range)
{
if (part->info.partition_id != drop_range.partition_id)
throw Exception("Unexpected partition_id of part " + part->name + ". This is a bug.", ErrorCodes::LOGICAL_ERROR);
if (part->info.min_block < drop_range.min_block)
{
if (drop_range.min_block <= part->info.max_block)
{
/// Intersect left border
String error = "Unexpected merged part " + part->name + " intersecting drop range " + drop_range.getPartName();
if (!skip_intersecting_parts)
throw Exception(error, ErrorCodes::LOGICAL_ERROR);
LOG_WARNING(log, error);
}
continue;
}
/// Stop on new parts
if (part->info.min_block > drop_range.max_block)
break;
if (part->info.min_block <= drop_range.max_block && drop_range.max_block < part->info.max_block)
{
/// Intersect right border
String error = "Unexpected merged part " + part->name + " intersecting drop range " + drop_range.getPartName();
if (!skip_intersecting_parts)
throw Exception(error, ErrorCodes::LOGICAL_ERROR);
LOG_WARNING(log, error);
continue;
}
if (part->state != DataPartState::Deleting)
parts_to_remove.emplace_back(part);
}
removePartsFromWorkingSet(parts_to_remove, clear_without_timeout, lock);
return parts_to_remove;
}
void MergeTreeData::forgetPartAndMoveToDetached(const MergeTreeData::DataPartPtr & part_to_detach, const String & prefix, bool
restore_covered)
{
LOG_INFO(log, "Renaming " << part_to_detach->relative_path << " to " << prefix << part_to_detach->name << " and forgiving it.");
auto lock = lockParts();
auto it_part = data_parts_by_info.find(part_to_detach->info);
if (it_part == data_parts_by_info.end())
throw Exception("No such data part " + part_to_detach->getNameWithState(), ErrorCodes::NO_SUCH_DATA_PART);
/// What if part_to_detach is a reference to *it_part? Make a new owner just in case.
DataPartPtr part = *it_part;
if (part->state == DataPartState::Committed)
removePartContributionToColumnSizes(part);
modifyPartState(it_part, DataPartState::Deleting);
part->renameToDetached(prefix);
data_parts_indexes.erase(it_part);
if (restore_covered && part->info.level == 0)
{
LOG_WARNING(log, "Will not recover parts covered by zero-level part " << part->name);
return;
}
if (restore_covered)
{
Strings restored;
bool error = false;
String error_parts;
Int64 pos = part->info.min_block;
auto is_appropriate_state = [] (DataPartState state)
{
return state == DataPartState::Committed || state == DataPartState::Outdated;
};
auto update_error = [&] (DataPartIteratorByInfo it)
{
error = true;
error_parts += (*it)->getNameWithState() + " ";
};
auto it_middle = data_parts_by_info.lower_bound(part->info);
/// Restore the leftmost part covered by the part
if (it_middle != data_parts_by_info.begin())
{
auto it = std::prev(it_middle);
if (part->contains(**it) && is_appropriate_state((*it)->state))
{
/// Maybe, we must consider part level somehow
if ((*it)->info.min_block != part->info.min_block)
update_error(it);
if ((*it)->state != DataPartState::Committed)
{
addPartContributionToColumnSizes(*it);
modifyPartState(it, DataPartState::Committed); // iterator is not invalidated here
}
pos = (*it)->info.max_block + 1;
restored.push_back((*it)->name);
}
else
update_error(it);
}
else
error = true;
/// Restore "right" parts
for (auto it = it_middle; it != data_parts_by_info.end() && part->contains(**it); ++it)
{
if ((*it)->info.min_block < pos)
continue;
if (!is_appropriate_state((*it)->state))
{
update_error(it);
continue;
}
if ((*it)->info.min_block > pos)
update_error(it);
if ((*it)->state != DataPartState::Committed)
{
addPartContributionToColumnSizes(*it);
modifyPartState(it, DataPartState::Committed);
}
pos = (*it)->info.max_block + 1;
restored.push_back((*it)->name);
}
if (pos != part->info.max_block + 1)
error = true;
for (const String & name : restored)
{
LOG_INFO(log, "Activated part " << name);
}
if (error)
{
LOG_ERROR(log, "The set of parts restored in place of " << part->name << " looks incomplete."
<< " There might or might not be a data loss."
<< (error_parts.empty() ? "" : " Suspicious parts: " + error_parts));
}
}
}
void MergeTreeData::tryRemovePartImmediately(DataPartPtr && part)
{
DataPartPtr part_to_delete;
{
auto lock = lockParts();
LOG_TRACE(log, "Trying to immediately remove part " << part->getNameWithState());
auto it = data_parts_by_info.find(part->info);
if (it == data_parts_by_info.end() || (*it).get() != part.get())
throw Exception("Part " + part->name + " doesn't exist", ErrorCodes::LOGICAL_ERROR);
part.reset();
if (!((*it)->state == DataPartState::Outdated && it->unique()))
return;
modifyPartState(it, DataPartState::Deleting);
part_to_delete = *it;
}
try
{
part_to_delete->remove();
}
catch (...)
{
rollbackDeletingParts({part_to_delete});
throw;
}
removePartsFinally({part_to_delete});
LOG_TRACE(log, "Removed part " << part_to_delete->name);
}
size_t MergeTreeData::getTotalActiveSizeInBytes() const
{
size_t res = 0;
{
auto lock = lockParts();
for (const auto & part : getDataPartsStateRange(DataPartState::Committed))
res += part->getBytesOnDisk();
}
return res;
}
size_t MergeTreeData::getTotalActiveSizeInRows() const
{
size_t res = 0;
{
auto lock = lockParts();
for (const auto & part : getDataPartsStateRange(DataPartState::Committed))
res += part->rows_count;
}
return res;
}
size_t MergeTreeData::getPartsCount() const
{
auto lock = lockParts();
size_t res = 0;
for (const auto & part [[maybe_unused]] : getDataPartsStateRange(DataPartState::Committed))
++res;
return res;
}
size_t MergeTreeData::getMaxPartsCountForPartition() const
{
auto lock = lockParts();
size_t res = 0;
size_t cur_count = 0;
const String * cur_partition_id = nullptr;
for (const auto & part : getDataPartsStateRange(DataPartState::Committed))
{
if (cur_partition_id && part->info.partition_id == *cur_partition_id)
{
++cur_count;
}
else
{
cur_partition_id = &part->info.partition_id;
cur_count = 1;
}
res = std::max(res, cur_count);
}
return res;
}
std::optional<Int64> MergeTreeData::getMinPartDataVersion() const
{
auto lock = lockParts();
std::optional<Int64> result;
for (const auto & part : getDataPartsStateRange(DataPartState::Committed))
{
if (!result || *result > part->info.getDataVersion())
result = part->info.getDataVersion();
}
return result;
}
void MergeTreeData::delayInsertOrThrowIfNeeded(Poco::Event * until) const
{
const auto settings = getSettings();
const size_t parts_count_in_total = getPartsCount();
if (parts_count_in_total >= settings->max_parts_in_total)
{
ProfileEvents::increment(ProfileEvents::RejectedInserts);
throw Exception("Too many parts (" + toString(parts_count_in_total) + ") in all partitions in total. This indicates wrong choice of partition key. The threshold can be modified with 'max_parts_in_total' setting in <merge_tree> element in config.xml or with per-table setting.", ErrorCodes::TOO_MANY_PARTS);
}
const size_t parts_count_in_partition = getMaxPartsCountForPartition();
if (parts_count_in_partition < settings->parts_to_delay_insert)
return;
if (parts_count_in_partition >= settings->parts_to_throw_insert)
{
ProfileEvents::increment(ProfileEvents::RejectedInserts);
throw Exception("Too many parts (" + toString(parts_count_in_partition) + "). Merges are processing significantly slower than inserts.", ErrorCodes::TOO_MANY_PARTS);
}
const size_t max_k = settings->parts_to_throw_insert - settings->parts_to_delay_insert; /// always > 0
const size_t k = 1 + parts_count_in_partition - settings->parts_to_delay_insert; /// from 1 to max_k
const double delay_milliseconds = ::pow(settings->max_delay_to_insert * 1000, static_cast<double>(k) / max_k);
ProfileEvents::increment(ProfileEvents::DelayedInserts);
ProfileEvents::increment(ProfileEvents::DelayedInsertsMilliseconds, delay_milliseconds);
CurrentMetrics::Increment metric_increment(CurrentMetrics::DelayedInserts);
LOG_INFO(log, "Delaying inserting block by "
<< std::fixed << std::setprecision(4) << delay_milliseconds << " ms. because there are " << parts_count_in_partition << " parts");
if (until)
until->tryWait(delay_milliseconds);
else
std::this_thread::sleep_for(std::chrono::milliseconds(static_cast<size_t>(delay_milliseconds)));
}
void MergeTreeData::throwInsertIfNeeded() const
{
const auto settings = getSettings();
const size_t parts_count_in_total = getPartsCount();
if (parts_count_in_total >= settings->max_parts_in_total)
{
ProfileEvents::increment(ProfileEvents::RejectedInserts);
throw Exception("Too many parts (" + toString(parts_count_in_total) + ") in all partitions in total. This indicates wrong choice of partition key. The threshold can be modified with 'max_parts_in_total' setting in <merge_tree> element in config.xml or with per-table setting.", ErrorCodes::TOO_MANY_PARTS);
}
const size_t parts_count_in_partition = getMaxPartsCountForPartition();
if (parts_count_in_partition >= settings->parts_to_throw_insert)
{
ProfileEvents::increment(ProfileEvents::RejectedInserts);
throw Exception("Too many parts (" + toString(parts_count_in_partition) + "). Merges are processing significantly slower than inserts.", ErrorCodes::TOO_MANY_PARTS);
}
}
MergeTreeData::DataPartPtr MergeTreeData::getActiveContainingPart(
const MergeTreePartInfo & part_info, MergeTreeData::DataPartState state, DataPartsLock & /*lock*/) const
{
auto current_state_parts_range = getDataPartsStateRange(state);
/// The part can be covered only by the previous or the next one in data_parts.
auto it = data_parts_by_state_and_info.lower_bound(DataPartStateAndInfo{state, part_info});
if (it != current_state_parts_range.end())
{
if ((*it)->info == part_info)
return *it;
if ((*it)->info.contains(part_info))
return *it;
}
if (it != current_state_parts_range.begin())
{
--it;
if ((*it)->info.contains(part_info))
return *it;
}
return nullptr;
}
void MergeTreeData::swapActivePart(MergeTreeData::DataPartPtr part_copy)
{
auto lock = lockParts();
for (auto original_active_part : getDataPartsStateRange(DataPartState::Committed)) // NOLINT (copy is intended)
{
if (part_copy->name == original_active_part->name)
{
auto active_part_it = data_parts_by_info.find(original_active_part->info);
if (active_part_it == data_parts_by_info.end())
throw Exception("Cannot swap part '" + part_copy->name + "', no such active part.", ErrorCodes::NO_SUCH_DATA_PART);
modifyPartState(original_active_part, DataPartState::DeleteOnDestroy);
data_parts_indexes.erase(active_part_it);
auto part_it = data_parts_indexes.insert(part_copy).first;
modifyPartState(part_it, DataPartState::Committed);
auto disk = original_active_part->disk;
String marker_path = original_active_part->getFullRelativePath() + DELETE_ON_DESTROY_MARKER_PATH;
try
{
disk->createFile(marker_path);
}
catch (Poco::Exception & e)
{
LOG_ERROR(log, e.what() << " (while creating DeleteOnDestroy marker: " + backQuote(fullPath(disk, marker_path)) + ")");
}
return;
}
}
throw Exception("Cannot swap part '" + part_copy->name + "', no such active part.", ErrorCodes::NO_SUCH_DATA_PART);
}
MergeTreeData::DataPartPtr MergeTreeData::getActiveContainingPart(const MergeTreePartInfo & part_info) const
{
auto lock = lockParts();
return getActiveContainingPart(part_info, DataPartState::Committed, lock);
}
MergeTreeData::DataPartPtr MergeTreeData::getActiveContainingPart(const String & part_name) const
{
auto part_info = MergeTreePartInfo::fromPartName(part_name, format_version);
return getActiveContainingPart(part_info);
}
MergeTreeData::DataPartsVector MergeTreeData::getDataPartsVectorInPartition(MergeTreeData::DataPartState state, const String & partition_id)
{
DataPartStateAndPartitionID state_with_partition{state, partition_id};
auto lock = lockParts();
return DataPartsVector(
data_parts_by_state_and_info.lower_bound(state_with_partition),
data_parts_by_state_and_info.upper_bound(state_with_partition));
}
MergeTreeData::DataPartPtr MergeTreeData::getPartIfExists(const MergeTreePartInfo & part_info, const MergeTreeData::DataPartStates & valid_states)
{
auto lock = lockParts();
auto it = data_parts_by_info.find(part_info);
if (it == data_parts_by_info.end())
return nullptr;
for (auto state : valid_states)
{
if ((*it)->state == state)
return *it;
}
return nullptr;
}
MergeTreeData::DataPartPtr MergeTreeData::getPartIfExists(const String & part_name, const MergeTreeData::DataPartStates & valid_states)
{
return getPartIfExists(MergeTreePartInfo::fromPartName(part_name, format_version), valid_states);
}
static void loadPartAndFixMetadataImpl(MergeTreeData::MutableDataPartPtr part)
{
auto disk = part->disk;
String full_part_path = part->getFullRelativePath();
/// Earlier the list of columns was written incorrectly. Delete it and re-create.
/// But in compact parts we can't get list of columns without this file.
if (isWidePart(part))
disk->removeIfExists(full_part_path + "columns.txt");
part->loadColumnsChecksumsIndexes(false, true);
part->modification_time = disk->getLastModified(full_part_path).epochTime();
/// If the checksums file is not present, calculate the checksums and write them to disk.
/// Check the data while we are at it.
if (part->checksums.empty())
{
part->checksums = checkDataPart(part, false);
{
auto out = disk->writeFile(full_part_path + "checksums.txt.tmp", 4096);
part->checksums.write(*out);
}
disk->moveFile(full_part_path + "checksums.txt.tmp", full_part_path + "checksums.txt");
}
}
MergeTreeData::MutableDataPartPtr MergeTreeData::loadPartAndFixMetadata(const DiskPtr & disk, const String & relative_path) const
{
MutableDataPartPtr part = createPart(Poco::Path(relative_path).getFileName(), disk, relative_path);
loadPartAndFixMetadataImpl(part);
return part;
}
void MergeTreeData::calculateColumnSizesImpl()
{
column_sizes.clear();
/// Take into account only committed parts
auto committed_parts_range = getDataPartsStateRange(DataPartState::Committed);
for (const auto & part : committed_parts_range)
addPartContributionToColumnSizes(part);
}
void MergeTreeData::addPartContributionToColumnSizes(const DataPartPtr & part)
{
for (const auto & column : part->getColumns())
{
ColumnSize & total_column_size = column_sizes[column.name];
ColumnSize part_column_size = part->getColumnSize(column.name, *column.type);
total_column_size.add(part_column_size);
}
}
void MergeTreeData::removePartContributionToColumnSizes(const DataPartPtr & part)
{
for (const auto & column : part->getColumns())
{
ColumnSize & total_column_size = column_sizes[column.name];
ColumnSize part_column_size = part->getColumnSize(column.name, *column.type);
auto log_subtract = [&](size_t & from, size_t value, const char * field)
{
if (value > from)
LOG_ERROR(log, "Possibly incorrect column size subtraction: "
<< from << " - " << value << " = " << from - value
<< ", column: " << column.name << ", field: " << field);
from -= value;
};
log_subtract(total_column_size.data_compressed, part_column_size.data_compressed, ".data_compressed");
log_subtract(total_column_size.data_uncompressed, part_column_size.data_uncompressed, ".data_uncompressed");
log_subtract(total_column_size.marks, part_column_size.marks, ".marks");
}
}
void MergeTreeData::freezePartition(const ASTPtr & partition_ast, const String & with_name, const Context & context, TableStructureReadLockHolder &)
{
std::optional<String> prefix;
String partition_id;
if (format_version < MERGE_TREE_DATA_MIN_FORMAT_VERSION_WITH_CUSTOM_PARTITIONING)
{
/// Month-partitioning specific - partition value can represent a prefix of the partition to freeze.
if (const auto * partition_lit = partition_ast->as<ASTPartition &>().value->as<ASTLiteral>())
prefix = partition_lit->value.getType() == Field::Types::UInt64
? toString(partition_lit->value.get<UInt64>())
: partition_lit->value.safeGet<String>();
else
partition_id = getPartitionIDFromQuery(partition_ast, context);
}
else
partition_id = getPartitionIDFromQuery(partition_ast, context);
if (prefix)
LOG_DEBUG(log, "Freezing parts with prefix " + *prefix);
else
LOG_DEBUG(log, "Freezing parts with partition ID " + partition_id);
freezePartitionsByMatcher(
[&prefix, &partition_id](const DataPartPtr & part)
{
if (prefix)
return startsWith(part->info.partition_id, *prefix);
else
return part->info.partition_id == partition_id;
},
with_name,
context);
}
void MergeTreeData::movePartitionToDisk(const ASTPtr & partition, const String & name, bool moving_part, const Context & context)
{
String partition_id;
if (moving_part)
partition_id = partition->as<ASTLiteral &>().value.safeGet<String>();
else
partition_id = getPartitionIDFromQuery(partition, context);
DataPartsVector parts;
if (moving_part)
{
auto part_info = MergeTreePartInfo::fromPartName(partition_id, format_version);
parts.push_back(getActiveContainingPart(part_info));
if (!parts.back() || parts.back()->name != part_info.getPartName())
throw Exception("Part " + partition_id + " is not exists or not active", ErrorCodes::NO_SUCH_DATA_PART);
}
else
parts = getDataPartsVectorInPartition(MergeTreeDataPartState::Committed, partition_id);
auto disk = getStoragePolicy()->getDiskByName(name);
if (!disk)
throw Exception("Disk " + name + " does not exists on policy " + getStoragePolicy()->getName(), ErrorCodes::UNKNOWN_DISK);
parts.erase(std::remove_if(parts.begin(), parts.end(), [&](auto part_ptr)
{
return part_ptr->disk->getName() == disk->getName();
}), parts.end());
if (parts.empty())
throw Exception("Nothing to move", ErrorCodes::NO_SUCH_DATA_PART);
if (parts.empty())
{
String no_parts_to_move_message;
if (moving_part)
no_parts_to_move_message = "Part '" + partition_id + "' is already on disk '" + disk->getName() + "'";
else
no_parts_to_move_message = "All parts of partition '" + partition_id + "' are already on disk '" + disk->getName() + "'";
throw Exception(no_parts_to_move_message, ErrorCodes::UNKNOWN_DISK);
}
if (!movePartsToSpace(parts, std::static_pointer_cast<Space>(disk)))
throw Exception("Cannot move parts because moves are manually disabled", ErrorCodes::ABORTED);
}
void MergeTreeData::movePartitionToVolume(const ASTPtr & partition, const String & name, bool moving_part, const Context & context)
{
String partition_id;
if (moving_part)
partition_id = partition->as<ASTLiteral &>().value.safeGet<String>();
else
partition_id = getPartitionIDFromQuery(partition, context);
DataPartsVector parts;
if (moving_part)
{
auto part_info = MergeTreePartInfo::fromPartName(partition_id, format_version);
parts.emplace_back(getActiveContainingPart(part_info));
if (!parts.back() || parts.back()->name != part_info.getPartName())
throw Exception("Part " + partition_id + " is not exists or not active", ErrorCodes::NO_SUCH_DATA_PART);
}
else
parts = getDataPartsVectorInPartition(MergeTreeDataPartState::Committed, partition_id);
auto volume = getStoragePolicy()->getVolumeByName(name);
if (!volume)
throw Exception("Volume " + name + " does not exists on policy " + getStoragePolicy()->getName(), ErrorCodes::UNKNOWN_DISK);
if (parts.empty())
throw Exception("Nothing to move", ErrorCodes::NO_SUCH_DATA_PART);
parts.erase(std::remove_if(parts.begin(), parts.end(), [&](auto part_ptr)
{
for (const auto & disk : volume->disks)
{
if (part_ptr->disk->getName() == disk->getName())
{
return true;
}
}
return false;
}), parts.end());
if (parts.empty())
{
String no_parts_to_move_message;
if (moving_part)
no_parts_to_move_message = "Part '" + partition_id + "' is already on volume '" + volume->getName() + "'";
else
no_parts_to_move_message = "All parts of partition '" + partition_id + "' are already on volume '" + volume->getName() + "'";
throw Exception(no_parts_to_move_message, ErrorCodes::UNKNOWN_DISK);
}
if (!movePartsToSpace(parts, std::static_pointer_cast<Space>(volume)))
throw Exception("Cannot move parts because moves are manually disabled", ErrorCodes::ABORTED);
}
String MergeTreeData::getPartitionIDFromQuery(const ASTPtr & ast, const Context & context)
{
const auto & partition_ast = ast->as<ASTPartition &>();
if (!partition_ast.value)
return partition_ast.id;
if (format_version < MERGE_TREE_DATA_MIN_FORMAT_VERSION_WITH_CUSTOM_PARTITIONING)
{
/// Month-partitioning specific - partition ID can be passed in the partition value.
const auto * partition_lit = partition_ast.value->as<ASTLiteral>();
if (partition_lit && partition_lit->value.getType() == Field::Types::String)
{
String partition_id = partition_lit->value.get<String>();
if (partition_id.size() != 6 || !std::all_of(partition_id.begin(), partition_id.end(), isNumericASCII))
throw Exception(
"Invalid partition format: " + partition_id + ". Partition should consist of 6 digits: YYYYMM",
ErrorCodes::INVALID_PARTITION_VALUE);
return partition_id;
}
}
/// Re-parse partition key fields using the information about expected field types.
size_t fields_count = partition_key_sample.columns();
if (partition_ast.fields_count != fields_count)
throw Exception(
"Wrong number of fields in the partition expression: " + toString(partition_ast.fields_count) +
", must be: " + toString(fields_count),
ErrorCodes::INVALID_PARTITION_VALUE);
const FormatSettings format_settings;
Row partition_row(fields_count);
if (fields_count)
{
ReadBufferFromMemory left_paren_buf("(", 1);
ReadBufferFromMemory fields_buf(partition_ast.fields_str.data(), partition_ast.fields_str.size());
ReadBufferFromMemory right_paren_buf(")", 1);
ConcatReadBuffer buf({&left_paren_buf, &fields_buf, &right_paren_buf});
auto input_stream = FormatFactory::instance().getInput("Values", buf, partition_key_sample, context, context.getSettingsRef().max_block_size);
auto block = input_stream->read();
if (!block || !block.rows())
throw Exception(
"Could not parse partition value: `" + partition_ast.fields_str + "`",
ErrorCodes::INVALID_PARTITION_VALUE);
for (size_t i = 0; i < fields_count; ++i)
block.getByPosition(i).column->get(0, partition_row[i]);
}
MergeTreePartition partition(std::move(partition_row));
String partition_id = partition.getID(*this);
{
auto data_parts_lock = lockParts();
DataPartPtr existing_part_in_partition = getAnyPartInPartition(partition_id, data_parts_lock);
if (existing_part_in_partition && existing_part_in_partition->partition.value != partition.value)
{
WriteBufferFromOwnString buf;
writeCString("Parsed partition value: ", buf);
partition.serializeText(*this, buf, format_settings);
writeCString(" doesn't match partition value for an existing part with the same partition ID: ", buf);
writeString(existing_part_in_partition->name, buf);
throw Exception(buf.str(), ErrorCodes::INVALID_PARTITION_VALUE);
}
}
return partition_id;
}
MergeTreeData::DataPartsVector MergeTreeData::getDataPartsVector(const DataPartStates & affordable_states, DataPartStateVector * out_states) const
{
DataPartsVector res;
DataPartsVector buf;
{
auto lock = lockParts();
for (auto state : affordable_states)
{
std::swap(buf, res);
res.clear();
auto range = getDataPartsStateRange(state);
std::merge(range.begin(), range.end(), buf.begin(), buf.end(), std::back_inserter(res), LessDataPart());
}
if (out_states != nullptr)
{
out_states->resize(res.size());
for (size_t i = 0; i < res.size(); ++i)
(*out_states)[i] = res[i]->state;
}
}
return res;
}
MergeTreeData::DataPartsVector MergeTreeData::getAllDataPartsVector(MergeTreeData::DataPartStateVector * out_states) const
{
DataPartsVector res;
{
auto lock = lockParts();
res.assign(data_parts_by_info.begin(), data_parts_by_info.end());
if (out_states != nullptr)
{
out_states->resize(res.size());
for (size_t i = 0; i < res.size(); ++i)
(*out_states)[i] = res[i]->state;
}
}
return res;
}
std::vector<DetachedPartInfo>
MergeTreeData::getDetachedParts() const
{
std::vector<DetachedPartInfo> res;
for (const auto & [path, disk] : getRelativeDataPathsWithDisks())
{
for (auto it = disk->iterateDirectory(path + "detached"); it->isValid(); it->next())
{
res.emplace_back();
auto & part = res.back();
DetachedPartInfo::tryParseDetachedPartName(it->name(), part, format_version);
part.disk = disk->getName();
}
}
return res;
}
void MergeTreeData::validateDetachedPartName(const String & name) const
{
if (name.find('/') != std::string::npos || name == "." || name == "..")
throw DB::Exception("Invalid part name '" + name + "'", ErrorCodes::INCORRECT_FILE_NAME);
auto full_path = getFullRelativePathForPart(name, "detached/");
if (!full_path)
throw DB::Exception("Detached part \"" + name + "\" not found" , ErrorCodes::BAD_DATA_PART_NAME);
if (startsWith(name, "attaching_") || startsWith(name, "deleting_"))
throw DB::Exception("Cannot drop part " + name + ": "
"most likely it is used by another DROP or ATTACH query.",
ErrorCodes::BAD_DATA_PART_NAME);
}
void MergeTreeData::dropDetached(const ASTPtr & partition, bool part, const Context & context)
{
PartsTemporaryRename renamed_parts(*this, "detached/");
if (part)
{
String part_name = partition->as<ASTLiteral &>().value.safeGet<String>();
validateDetachedPartName(part_name);
renamed_parts.addPart(part_name, "deleting_" + part_name);
}
else
{
String partition_id = getPartitionIDFromQuery(partition, context);
DetachedPartsInfo detached_parts = getDetachedParts();
for (const auto & part_info : detached_parts)
if (part_info.valid_name && part_info.partition_id == partition_id
&& part_info.prefix != "attaching" && part_info.prefix != "deleting")
renamed_parts.addPart(part_info.dir_name, "deleting_" + part_info.dir_name);
}
LOG_DEBUG(log, "Will drop " << renamed_parts.old_and_new_names.size() << " detached parts.");
renamed_parts.tryRenameAll();
for (auto & [old_name, new_name] : renamed_parts.old_and_new_names)
{
const auto & [path, disk] = renamed_parts.old_part_name_to_path_and_disk[old_name];
disk->removeRecursive(path + "detached/" + new_name + "/");
LOG_DEBUG(log, "Dropped detached part " << old_name);
old_name.clear();
}
}
MergeTreeData::MutableDataPartsVector MergeTreeData::tryLoadPartsToAttach(const ASTPtr & partition, bool attach_part,
const Context & context, PartsTemporaryRename & renamed_parts)
{
String source_dir = "detached/";
std::map<String, DiskPtr> name_to_disk;
/// Let's compose a list of parts that should be added.
if (attach_part)
{
String part_id = partition->as<ASTLiteral &>().value.safeGet<String>();
validateDetachedPartName(part_id);
renamed_parts.addPart(part_id, "attaching_" + part_id);
if (MergeTreePartInfo::tryParsePartName(part_id, nullptr, format_version))
name_to_disk[part_id] = getDiskForPart(part_id, source_dir);
}
else
{
String partition_id = getPartitionIDFromQuery(partition, context);
LOG_DEBUG(log, "Looking for parts for partition " << partition_id << " in " << source_dir);
ActiveDataPartSet active_parts(format_version);
const auto disks = getStoragePolicy()->getDisks();
for (const auto & disk : disks)
{
for (auto it = disk->iterateDirectory(relative_data_path + source_dir); it->isValid(); it->next())
{
const String & name = it->name();
MergeTreePartInfo part_info;
// TODO what if name contains "_tryN" suffix?
/// Parts with prefix in name (e.g. attaching_1_3_3_0, deleting_1_3_3_0) will be ignored
if (!MergeTreePartInfo::tryParsePartName(name, &part_info, format_version)
|| part_info.partition_id != partition_id)
{
continue;
}
LOG_DEBUG(log, "Found part " << name);
active_parts.add(name);
name_to_disk[name] = disk;
}
}
LOG_DEBUG(log, active_parts.size() << " of them are active");
/// Inactive parts rename so they can not be attached in case of repeated ATTACH.
for (const auto & [name, disk] : name_to_disk)
{
String containing_part = active_parts.getContainingPart(name);
if (!containing_part.empty() && containing_part != name)
{
// TODO maybe use PartsTemporaryRename here?
disk->moveDirectory(relative_data_path + source_dir + name, relative_data_path + source_dir + "inactive_" + name);
}
else
renamed_parts.addPart(name, "attaching_" + name);
}
}
/// Try to rename all parts before attaching to prevent race with DROP DETACHED and another ATTACH.
renamed_parts.tryRenameAll();
/// Synchronously check that added parts exist and are not broken. We will write checksums.txt if it does not exist.
LOG_DEBUG(log, "Checking parts");
MutableDataPartsVector loaded_parts;
loaded_parts.reserve(renamed_parts.old_and_new_names.size());
for (const auto & part_names : renamed_parts.old_and_new_names)
{
LOG_DEBUG(log, "Checking part " << part_names.second);
MutableDataPartPtr part = createPart(part_names.first, name_to_disk[part_names.first], source_dir + part_names.second);
loadPartAndFixMetadataImpl(part);
loaded_parts.push_back(part);
}
return loaded_parts;
}
namespace
{
inline ReservationPtr checkAndReturnReservation(UInt64 expected_size, ReservationPtr reservation)
{
if (reservation)
return reservation;
throw Exception("Cannot reserve " + formatReadableSizeWithBinarySuffix(expected_size) + ", not enough space",
ErrorCodes::NOT_ENOUGH_SPACE);
}
}
ReservationPtr MergeTreeData::reserveSpace(UInt64 expected_size) const
{
expected_size = std::max(RESERVATION_MIN_ESTIMATION_SIZE, expected_size);
auto reservation = getStoragePolicy()->reserve(expected_size);
return checkAndReturnReservation(expected_size, std::move(reservation));
}
ReservationPtr MergeTreeData::reserveSpace(UInt64 expected_size, SpacePtr space)
{
expected_size = std::max(RESERVATION_MIN_ESTIMATION_SIZE, expected_size);
auto reservation = tryReserveSpace(expected_size, space);
return checkAndReturnReservation(expected_size, std::move(reservation));
}
ReservationPtr MergeTreeData::tryReserveSpace(UInt64 expected_size, SpacePtr space)
{
expected_size = std::max(RESERVATION_MIN_ESTIMATION_SIZE, expected_size);
return space->reserve(expected_size);
}
ReservationPtr MergeTreeData::reserveSpacePreferringTTLRules(UInt64 expected_size,
const IMergeTreeDataPart::TTLInfos & ttl_infos,
time_t time_of_move,
size_t min_volume_index) const
{
expected_size = std::max(RESERVATION_MIN_ESTIMATION_SIZE, expected_size);
ReservationPtr reservation = tryReserveSpacePreferringTTLRules(expected_size, ttl_infos, time_of_move, min_volume_index);
return checkAndReturnReservation(expected_size, std::move(reservation));
}
ReservationPtr MergeTreeData::tryReserveSpacePreferringTTLRules(UInt64 expected_size,
const IMergeTreeDataPart::TTLInfos & ttl_infos,
time_t time_of_move,
size_t min_volume_index) const
{
expected_size = std::max(RESERVATION_MIN_ESTIMATION_SIZE, expected_size);
ReservationPtr reservation;
auto ttl_entry = selectTTLEntryForTTLInfos(ttl_infos, time_of_move);
if (ttl_entry)
{
SpacePtr destination_ptr = ttl_entry->getDestination(getStoragePolicy());
if (!destination_ptr)
{
if (ttl_entry->destination_type == PartDestinationType::VOLUME)
LOG_WARNING(log, "Would like to reserve space on volume '"
<< ttl_entry->destination_name << "' by TTL rule of table '"
<< log_name << "' but volume was not found");
else if (ttl_entry->destination_type == PartDestinationType::DISK)
LOG_WARNING(log, "Would like to reserve space on disk '"
<< ttl_entry->destination_name << "' by TTL rule of table '"
<< log_name << "' but disk was not found");
}
else
{
reservation = destination_ptr->reserve(expected_size);
if (reservation)
return reservation;
else
if (ttl_entry->destination_type == PartDestinationType::VOLUME)
LOG_WARNING(log, "Would like to reserve space on volume '"
<< ttl_entry->destination_name << "' by TTL rule of table '"
<< log_name << "' but there is not enough space");
else if (ttl_entry->destination_type == PartDestinationType::DISK)
LOG_WARNING(log, "Would like to reserve space on disk '"
<< ttl_entry->destination_name << "' by TTL rule of table '"
<< log_name << "' but there is not enough space");
}
}
reservation = getStoragePolicy()->reserve(expected_size, min_volume_index);
return reservation;
}
SpacePtr MergeTreeData::TTLEntry::getDestination(StoragePolicyPtr policy) const
{
if (destination_type == PartDestinationType::VOLUME)
return policy->getVolumeByName(destination_name);
else if (destination_type == PartDestinationType::DISK)
return policy->getDiskByName(destination_name);
else
return {};
}
bool MergeTreeData::TTLEntry::isPartInDestination(StoragePolicyPtr policy, const IMergeTreeDataPart & part) const
{
if (destination_type == PartDestinationType::VOLUME)
{
for (const auto & disk : policy->getVolumeByName(destination_name)->disks)
if (disk->getName() == part.disk->getName())
return true;
}
else if (destination_type == PartDestinationType::DISK)
return policy->getDiskByName(destination_name)->getName() == part.disk->getName();
return false;
}
std::optional<MergeTreeData::TTLEntry> MergeTreeData::selectTTLEntryForTTLInfos(
const IMergeTreeDataPart::TTLInfos & ttl_infos,
time_t time_of_move) const
{
time_t max_max_ttl = 0;
std::vector<DB::MergeTreeData::TTLEntry>::const_iterator best_entry_it;
auto lock = std::lock_guard(move_ttl_entries_mutex);
for (auto ttl_entry_it = move_ttl_entries.begin(); ttl_entry_it != move_ttl_entries.end(); ++ttl_entry_it)
{
auto ttl_info_it = ttl_infos.moves_ttl.find(ttl_entry_it->result_column);
/// Prefer TTL rule which went into action last.
if (ttl_info_it != ttl_infos.moves_ttl.end()
&& ttl_info_it->second.max <= time_of_move
&& max_max_ttl <= ttl_info_it->second.max)
{
best_entry_it = ttl_entry_it;
max_max_ttl = ttl_info_it->second.max;
}
}
return max_max_ttl ? *best_entry_it : std::optional<MergeTreeData::TTLEntry>();
}
MergeTreeData::DataParts MergeTreeData::getDataParts(const DataPartStates & affordable_states) const
{
DataParts res;
{
auto lock = lockParts();
for (auto state : affordable_states)
{
auto range = getDataPartsStateRange(state);
res.insert(range.begin(), range.end());
}
}
return res;
}
MergeTreeData::DataParts MergeTreeData::getDataParts() const
{
return getDataParts({DataPartState::Committed});
}
MergeTreeData::DataPartsVector MergeTreeData::getDataPartsVector() const
{
return getDataPartsVector({DataPartState::Committed});
}
MergeTreeData::DataPartPtr MergeTreeData::getAnyPartInPartition(
const String & partition_id, DataPartsLock & /*data_parts_lock*/)
{
auto it = data_parts_by_state_and_info.lower_bound(DataPartStateAndPartitionID{DataPartState::Committed, partition_id});
if (it != data_parts_by_state_and_info.end() && (*it)->state == DataPartState::Committed && (*it)->info.partition_id == partition_id)
return *it;
return nullptr;
}
void MergeTreeData::Transaction::rollback()
{
if (!isEmpty())
{
std::stringstream ss;
ss << " Removing parts:";
for (const auto & part : precommitted_parts)
ss << " " << part->relative_path;
ss << ".";
LOG_DEBUG(data.log, "Undoing transaction." << ss.str());
data.removePartsFromWorkingSet(
DataPartsVector(precommitted_parts.begin(), precommitted_parts.end()),
/* clear_without_timeout = */ true);
}
clear();
}
MergeTreeData::DataPartsVector MergeTreeData::Transaction::commit(MergeTreeData::DataPartsLock * acquired_parts_lock)
{
DataPartsVector total_covered_parts;
if (!isEmpty())
{
auto parts_lock = acquired_parts_lock ? MergeTreeData::DataPartsLock() : data.lockParts();
auto * owing_parts_lock = acquired_parts_lock ? acquired_parts_lock : &parts_lock;
auto current_time = time(nullptr);
for (const DataPartPtr & part : precommitted_parts)
{
DataPartPtr covering_part;
DataPartsVector covered_parts = data.getActivePartsToReplace(part->info, part->name, covering_part, *owing_parts_lock);
if (covering_part)
{
LOG_WARNING(data.log, "Tried to commit obsolete part " << part->name
<< " covered by " << covering_part->getNameWithState());
part->remove_time.store(0, std::memory_order_relaxed); /// The part will be removed without waiting for old_parts_lifetime seconds.
data.modifyPartState(part, DataPartState::Outdated);
}
else
{
total_covered_parts.insert(total_covered_parts.end(), covered_parts.begin(), covered_parts.end());
for (const DataPartPtr & covered_part : covered_parts)
{
covered_part->remove_time.store(current_time, std::memory_order_relaxed);
data.modifyPartState(covered_part, DataPartState::Outdated);
data.removePartContributionToColumnSizes(covered_part);
}
data.modifyPartState(part, DataPartState::Committed);
data.addPartContributionToColumnSizes(part);
}
}
}
clear();
return total_covered_parts;
}
bool MergeTreeData::isPrimaryOrMinMaxKeyColumnPossiblyWrappedInFunctions(const ASTPtr & node) const
{
const String column_name = node->getColumnName();
for (const auto & name : primary_key_columns)
if (column_name == name)
return true;
for (const auto & name : minmax_idx_columns)
if (column_name == name)
return true;
if (const auto * func = node->as<ASTFunction>())
if (func->arguments->children.size() == 1)
return isPrimaryOrMinMaxKeyColumnPossiblyWrappedInFunctions(func->arguments->children.front());
return false;
}
bool MergeTreeData::mayBenefitFromIndexForIn(const ASTPtr & left_in_operand, const Context &) const
{
/// Make sure that the left side of the IN operator contain part of the key.
/// If there is a tuple on the left side of the IN operator, at least one item of the tuple
/// must be part of the key (probably wrapped by a chain of some acceptable functions).
const auto * left_in_operand_tuple = left_in_operand->as<ASTFunction>();
if (left_in_operand_tuple && left_in_operand_tuple->name == "tuple")
{
for (const auto & item : left_in_operand_tuple->arguments->children)
{
if (isPrimaryOrMinMaxKeyColumnPossiblyWrappedInFunctions(item))
return true;
for (const auto & index : skip_indices)
if (index->mayBenefitFromIndexForIn(item))
return true;
}
/// The tuple itself may be part of the primary key, so check that as a last resort.
return isPrimaryOrMinMaxKeyColumnPossiblyWrappedInFunctions(left_in_operand);
}
else
{
for (const auto & index : skip_indices)
if (index->mayBenefitFromIndexForIn(left_in_operand))
return true;
return isPrimaryOrMinMaxKeyColumnPossiblyWrappedInFunctions(left_in_operand);
}
}
MergeTreeData & MergeTreeData::checkStructureAndGetMergeTreeData(IStorage & source_table) const
{
MergeTreeData * src_data = dynamic_cast<MergeTreeData *>(&source_table);
if (!src_data)
throw Exception("Table " + source_table.getStorageID().getNameForLogs() +
" supports attachPartitionFrom only for MergeTree family of table engines."
" Got " + source_table.getName(), ErrorCodes::NOT_IMPLEMENTED);
if (getColumns().getAllPhysical().sizeOfDifference(src_data->getColumns().getAllPhysical()))
throw Exception("Tables have different structure", ErrorCodes::INCOMPATIBLE_COLUMNS);
auto query_to_string = [] (const ASTPtr & ast)
{
return ast ? queryToString(ast) : "";
};
if (query_to_string(order_by_ast) != query_to_string(src_data->order_by_ast))
throw Exception("Tables have different ordering", ErrorCodes::BAD_ARGUMENTS);
if (query_to_string(partition_by_ast) != query_to_string(src_data->partition_by_ast))
throw Exception("Tables have different partition key", ErrorCodes::BAD_ARGUMENTS);
if (format_version != src_data->format_version)
throw Exception("Tables have different format_version", ErrorCodes::BAD_ARGUMENTS);
return *src_data;
}
MergeTreeData & MergeTreeData::checkStructureAndGetMergeTreeData(const StoragePtr & source_table) const
{
return checkStructureAndGetMergeTreeData(*source_table);
}
MergeTreeData::MutableDataPartPtr MergeTreeData::cloneAndLoadDataPartOnSameDisk(const MergeTreeData::DataPartPtr & src_part,
const String & tmp_part_prefix,
const MergeTreePartInfo & dst_part_info)
{
/// Check that the storage policy contains the disk where the src_part is located.
bool does_storage_policy_allow_same_disk = false;
for (const DiskPtr & disk : getStoragePolicy()->getDisks())
{
if (disk->getName() == src_part->disk->getName())
{
does_storage_policy_allow_same_disk = true;
break;
}
}
if (!does_storage_policy_allow_same_disk)
throw Exception(
"Could not clone and load part " + quoteString(src_part->getFullPath()) + " because disk does not belong to storage policy", ErrorCodes::BAD_ARGUMENTS);
String dst_part_name = src_part->getNewName(dst_part_info);
String tmp_dst_part_name = tmp_part_prefix + dst_part_name;
auto reservation = reserveSpace(src_part->getBytesOnDisk(), src_part->disk);
auto disk = reservation->getDisk();
String src_part_path = src_part->getFullRelativePath();
String dst_part_path = relative_data_path + tmp_dst_part_name;
if (disk->exists(dst_part_path))
throw Exception("Part in " + fullPath(disk, dst_part_path) + " already exists", ErrorCodes::DIRECTORY_ALREADY_EXISTS);
LOG_DEBUG(log, "Cloning part " << fullPath(disk, src_part_path) << " to " << fullPath(disk, dst_part_path));
localBackup(disk, src_part_path, dst_part_path);
disk->removeIfExists(dst_part_path + "/" + DELETE_ON_DESTROY_MARKER_PATH);
auto dst_data_part = createPart(dst_part_name, dst_part_info, reservation->getDisk(), tmp_dst_part_name);
dst_data_part->is_temp = true;
dst_data_part->loadColumnsChecksumsIndexes(require_part_metadata, true);
dst_data_part->modification_time = disk->getLastModified(dst_part_path).epochTime();
return dst_data_part;
}
String MergeTreeData::getFullPathOnDisk(const DiskPtr & disk) const
{
return disk->getPath() + relative_data_path;
}
DiskPtr MergeTreeData::getDiskForPart(const String & part_name, const String & additional_path) const
{
const auto disks = getStoragePolicy()->getDisks();
for (const DiskPtr & disk : disks)
for (auto it = disk->iterateDirectory(relative_data_path + additional_path); it->isValid(); it->next())
if (it->name() == part_name)
return disk;
return nullptr;
}
std::optional<String> MergeTreeData::getFullRelativePathForPart(const String & part_name, const String & additional_path) const
{
auto disk = getDiskForPart(part_name, additional_path);
if (disk)
return relative_data_path + additional_path;
return {};
}
Strings MergeTreeData::getDataPaths() const
{
Strings res;
auto disks = getStoragePolicy()->getDisks();
for (const auto & disk : disks)
res.push_back(getFullPathOnDisk(disk));
return res;
}
MergeTreeData::PathsWithDisks MergeTreeData::getRelativeDataPathsWithDisks() const
{
PathsWithDisks res;
auto disks = getStoragePolicy()->getDisks();
for (const auto & disk : disks)
res.emplace_back(relative_data_path, disk);
return res;
}
void MergeTreeData::freezePartitionsByMatcher(MatcherFn matcher, const String & with_name, const Context & context)
{
String clickhouse_path = Poco::Path(context.getPath()).makeAbsolute().toString();
String default_shadow_path = clickhouse_path + "shadow/";
Poco::File(default_shadow_path).createDirectories();
auto increment = Increment(default_shadow_path + "increment.txt").get(true);
const String shadow_path = "shadow/";
/// Acquire a snapshot of active data parts to prevent removing while doing backup.
const auto data_parts = getDataParts();
size_t parts_processed = 0;
for (const auto & part : data_parts)
{
if (!matcher(part))
continue;
part->disk->createDirectories(shadow_path);
String backup_path = shadow_path
+ (!with_name.empty()
? escapeForFileName(with_name)
: toString(increment))
+ "/";
LOG_DEBUG(log, "Freezing part " << part->name << " snapshot will be placed at " + backup_path);
String backup_part_path = backup_path + relative_data_path + part->relative_path;
localBackup(part->disk, part->getFullRelativePath(), backup_part_path);
part->disk->removeIfExists(backup_part_path + "/" + DELETE_ON_DESTROY_MARKER_PATH);
part->is_frozen.store(true, std::memory_order_relaxed);
++parts_processed;
}
LOG_DEBUG(log, "Freezed " << parts_processed << " parts");
}
bool MergeTreeData::canReplacePartition(const DataPartPtr & src_part) const
{
const auto settings = getSettings();
if (!settings->enable_mixed_granularity_parts || settings->index_granularity_bytes == 0)
{
if (!canUseAdaptiveGranularity() && src_part->index_granularity_info.is_adaptive)
return false;
if (canUseAdaptiveGranularity() && !src_part->index_granularity_info.is_adaptive)
return false;
}
return true;
}
void MergeTreeData::writePartLog(
PartLogElement::Type type,
const ExecutionStatus & execution_status,
UInt64 elapsed_ns,
const String & new_part_name,
const DataPartPtr & result_part,
const DataPartsVector & source_parts,
const MergeListEntry * merge_entry)
try
{
auto table_id = getStorageID();
auto part_log = global_context.getPartLog(table_id.database_name);
if (!part_log)
return;
PartLogElement part_log_elem;
part_log_elem.event_type = type;
part_log_elem.error = static_cast<UInt16>(execution_status.code);
part_log_elem.exception = execution_status.message;
part_log_elem.event_time = time(nullptr);
/// TODO: Stop stopwatch in outer code to exclude ZK timings and so on
part_log_elem.duration_ms = elapsed_ns / 1000000;
part_log_elem.database_name = table_id.database_name;
part_log_elem.table_name = table_id.table_name;
part_log_elem.partition_id = MergeTreePartInfo::fromPartName(new_part_name, format_version).partition_id;
part_log_elem.part_name = new_part_name;
if (result_part)
{
part_log_elem.path_on_disk = result_part->getFullPath();
part_log_elem.bytes_compressed_on_disk = result_part->getBytesOnDisk();
part_log_elem.rows = result_part->rows_count;
}
part_log_elem.source_part_names.reserve(source_parts.size());
for (const auto & source_part : source_parts)
part_log_elem.source_part_names.push_back(source_part->name);
if (merge_entry)
{
part_log_elem.rows_read = (*merge_entry)->rows_read;
part_log_elem.bytes_read_uncompressed = (*merge_entry)->bytes_read_uncompressed;
part_log_elem.rows = (*merge_entry)->rows_written;
part_log_elem.bytes_uncompressed = (*merge_entry)->bytes_written_uncompressed;
part_log_elem.peak_memory_usage = (*merge_entry)->memory_tracker.getPeak();
}
part_log->add(part_log_elem);
}
catch (...)
{
tryLogCurrentException(log, __PRETTY_FUNCTION__);
}
MergeTreeData::CurrentlyMovingPartsTagger::CurrentlyMovingPartsTagger(MergeTreeMovingParts && moving_parts_, MergeTreeData & data_)
: parts_to_move(std::move(moving_parts_)), data(data_)
{
for (const auto & moving_part : parts_to_move)
if (!data.currently_moving_parts.emplace(moving_part.part).second)
throw Exception("Cannot move part '" + moving_part.part->name + "'. It's already moving.", ErrorCodes::LOGICAL_ERROR);
}
MergeTreeData::CurrentlyMovingPartsTagger::~CurrentlyMovingPartsTagger()
{
std::lock_guard lock(data.moving_parts_mutex);
for (const auto & moving_part : parts_to_move)
{
/// Something went completely wrong
if (!data.currently_moving_parts.count(moving_part.part))
std::terminate();
data.currently_moving_parts.erase(moving_part.part);
}
}
bool MergeTreeData::selectPartsAndMove()
{
if (parts_mover.moves_blocker.isCancelled())
return false;
auto moving_tagger = selectPartsForMove();
if (moving_tagger.parts_to_move.empty())
return false;
return moveParts(std::move(moving_tagger));
}
bool MergeTreeData::areBackgroundMovesNeeded() const
{
auto policy = getStoragePolicy();
if (policy->getVolumes().size() > 1)
return true;
return policy->getVolumes().size() == 1 && policy->getVolumes()[0]->disks.size() > 1 && !move_ttl_entries.empty();
}
bool MergeTreeData::movePartsToSpace(const DataPartsVector & parts, SpacePtr space)
{
if (parts_mover.moves_blocker.isCancelled())
return false;
auto moving_tagger = checkPartsForMove(parts, space);
if (moving_tagger.parts_to_move.empty())
return false;
return moveParts(std::move(moving_tagger));
}
MergeTreeData::CurrentlyMovingPartsTagger MergeTreeData::selectPartsForMove()
{
MergeTreeMovingParts parts_to_move;
auto can_move = [this](const DataPartPtr & part, String * reason) -> bool
{
if (partIsAssignedToBackgroundOperation(part))
{
*reason = "part already assigned to background operation.";
return false;
}
if (currently_moving_parts.count(part))
{
*reason = "part is already moving.";
return false;
}
return true;
};
std::lock_guard moving_lock(moving_parts_mutex);
parts_mover.selectPartsForMove(parts_to_move, can_move, moving_lock);
return CurrentlyMovingPartsTagger(std::move(parts_to_move), *this);
}
MergeTreeData::CurrentlyMovingPartsTagger MergeTreeData::checkPartsForMove(const DataPartsVector & parts, SpacePtr space)
{
std::lock_guard moving_lock(moving_parts_mutex);
MergeTreeMovingParts parts_to_move;
for (const auto & part : parts)
{
auto reservation = space->reserve(part->getBytesOnDisk());
if (!reservation)
throw Exception("Move is not possible. Not enough space on '" + space->getName() + "'", ErrorCodes::NOT_ENOUGH_SPACE);
auto reserved_disk = reservation->getDisk();
if (reserved_disk->exists(relative_data_path + part->name))
throw Exception(
"Move is not possible: " + fullPath(reserved_disk, relative_data_path + part->name) + " already exists",
ErrorCodes::DIRECTORY_ALREADY_EXISTS);
if (currently_moving_parts.count(part) || partIsAssignedToBackgroundOperation(part))
throw Exception(
"Cannot move part '" + part->name + "' because it's participating in background process",
ErrorCodes::PART_IS_TEMPORARILY_LOCKED);
parts_to_move.emplace_back(part, std::move(reservation));
}
return CurrentlyMovingPartsTagger(std::move(parts_to_move), *this);
}
bool MergeTreeData::moveParts(CurrentlyMovingPartsTagger && moving_tagger)
{
LOG_INFO(log, "Got " << moving_tagger.parts_to_move.size() << " parts to move.");
for (const auto & moving_part : moving_tagger.parts_to_move)
{
Stopwatch stopwatch;
DataPartPtr cloned_part;
auto write_part_log = [&](const ExecutionStatus & execution_status)
{
writePartLog(
PartLogElement::Type::MOVE_PART,
execution_status,
stopwatch.elapsed(),
moving_part.part->name,
cloned_part,
{moving_part.part},
nullptr);
};
try
{
cloned_part = parts_mover.clonePart(moving_part);
parts_mover.swapClonedPart(cloned_part);
write_part_log({});
}
catch (...)
{
write_part_log(ExecutionStatus::fromCurrentException());
if (cloned_part)
cloned_part->remove();
throw;
}
}
return true;
}
ColumnDependencies MergeTreeData::getColumnDependencies(const NameSet & updated_columns) const
{
if (updated_columns.empty())
return {};
ColumnDependencies res;
NameSet indices_columns;
NameSet required_ttl_columns;
NameSet updated_ttl_columns;
auto add_dependent_columns = [&updated_columns](const auto & expression, auto & to_set)
{
auto requiered_columns = expression->getRequiredColumns();
for (const auto & dependency : requiered_columns)
{
if (updated_columns.count(dependency))
{
to_set.insert(requiered_columns.begin(), requiered_columns.end());
return true;
}
}
return false;
};
for (const auto & index : skip_indices)
add_dependent_columns(index->expr, indices_columns);
if (hasRowsTTL())
{
if (add_dependent_columns(rows_ttl_entry.expression, required_ttl_columns))
{
/// Filter all columns, if rows TTL expression have to be recalculated.
for (const auto & column : getColumns().getAllPhysical())
updated_ttl_columns.insert(column.name);
}
}
for (const auto & [name, entry] : column_ttl_entries_by_name)
{
if (add_dependent_columns(entry.expression, required_ttl_columns))
updated_ttl_columns.insert(name);
}
for (const auto & entry : move_ttl_entries)
add_dependent_columns(entry.expression, required_ttl_columns);
for (const auto & column : indices_columns)
res.emplace(column, ColumnDependency::SKIP_INDEX);
for (const auto & column : required_ttl_columns)
res.emplace(column, ColumnDependency::TTL_EXPRESSION);
for (const auto & column : updated_ttl_columns)
res.emplace(column, ColumnDependency::TTL_TARGET);
return res;
}
bool MergeTreeData::canUsePolymorphicParts(const MergeTreeSettings & settings, String * out_reason) const
{
if (!canUseAdaptiveGranularity())
{
if ((settings.min_rows_for_wide_part != 0 || settings.min_bytes_for_wide_part != 0) && out_reason)
{
std::ostringstream message;
message << "Table can't create parts with adaptive granularity, but settings min_rows_for_wide_part = "
<< settings.min_rows_for_wide_part << ", min_bytes_for_wide_part = " << settings.min_bytes_for_wide_part
<< ". Parts with non-adaptive granularity can be stored only in Wide (default) format.";
*out_reason = message.str();
}
return false;
}
return true;
}
MergeTreeData::AlterConversions MergeTreeData::getAlterConversionsForPart(const MergeTreeDataPartPtr part) const
{
MutationCommands commands = getFirtsAlterMutationCommandsForPart(part);
AlterConversions result{};
for (const auto & command : commands)
/// Currently we need explicit conversions only for RENAME alter
/// all other conversions can be deduced from diff between part columns
/// and columns in storage.
if (command.type == MutationCommand::Type::RENAME_COLUMN)
result.rename_map[command.rename_to] = command.column_name;
return result;
}
MergeTreeData::WriteAheadLogPtr MergeTreeData::getWriteAheadLog() const
{
return write_ahead_log;
}
NamesAndTypesList MergeTreeData::getVirtuals() const
{
return NamesAndTypesList{
NameAndTypePair("_part", std::make_shared<DataTypeString>()),
NameAndTypePair("_part_index", std::make_shared<DataTypeUInt64>()),
NameAndTypePair("_partition_id", std::make_shared<DataTypeString>()),
NameAndTypePair("_sample_factor", std::make_shared<DataTypeFloat64>()),
};
}
bool MergeTreeData::MergesThrottler::needDelayMerge() const
{
std::lock_guard lock(mutex);
return (!max_bytes || have_bytes < max_bytes) && (!max_rows || have_rows < max_rows);
}
void MergeTreeData::MergesThrottler::add(size_t bytes, size_t rows)
{
std::lock_guard lock(mutex);
have_bytes += bytes;
have_rows += rows;
}
void MergeTreeData::MergesThrottler::reset()
{
have_bytes = 0;
have_rows = 0;
}
}