ClickHouse/dbms/src/Storages/StorageStripeLog.cpp

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#include <map>
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#include <experimental/optional>
#include <Poco/Path.h>
#include <Poco/Util/XMLConfiguration.h>
#include <DB/Common/escapeForFileName.h>
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#include <DB/Common/Exception.h>
#include <DB/IO/ReadBufferFromFile.h>
#include <DB/IO/WriteBufferFromFile.h>
#include <DB/IO/CompressedReadBufferFromFile.h>
#include <DB/IO/CompressedWriteBuffer.h>
#include <DB/IO/ReadHelpers.h>
#include <DB/IO/WriteHelpers.h>
#include <DB/DataTypes/DataTypeArray.h>
#include <DB/DataTypes/DataTypeNested.h>
#include <DB/DataStreams/IProfilingBlockInputStream.h>
#include <DB/DataStreams/IBlockOutputStream.h>
#include <DB/DataStreams/NativeBlockInputStream.h>
#include <DB/DataStreams/NativeBlockOutputStream.h>
#include <DB/DataStreams/NullBlockInputStream.h>
#include <DB/Columns/ColumnArray.h>
#include <DB/Storages/StorageStripeLog.h>
#include <Poco/DirectoryIterator.h>
namespace DB
{
#define INDEX_BUFFER_SIZE 4096
namespace ErrorCodes
{
extern const int EMPTY_LIST_OF_COLUMNS_PASSED;
extern const int CANNOT_CREATE_DIRECTORY;
}
class StripeLogBlockInputStream : public IProfilingBlockInputStream
{
public:
StripeLogBlockInputStream(const NameSet & column_names_, StorageStripeLog & storage_, size_t max_read_buffer_size_,
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std::shared_ptr<const IndexForNativeFormat> & index_,
IndexForNativeFormat::Blocks::const_iterator index_begin_,
IndexForNativeFormat::Blocks::const_iterator index_end_)
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: storage(storage_), max_read_buffer_size(max_read_buffer_size_),
index(index_), index_begin(index_begin_), index_end(index_end_)
{
}
String getName() const override { return "StripeLog"; }
String getID() const override
{
std::stringstream s;
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s << this;
return s.str();
}
protected:
Block readImpl() override
{
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Block res;
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if (!started)
{
started = true;
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data_in.emplace(
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storage.full_path() + "data.bin", 0, 0,
std::min(max_read_buffer_size, Poco::File(storage.full_path() + "data.bin").getSize()));
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block_in.emplace(*data_in, 0, true, index_begin, index_end);
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}
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if (block_in)
{
res = block_in->read();
/// Освобождаем память раньше уничтожения объекта.
if (!res)
{
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block_in = std::experimental::nullopt;
data_in = std::experimental::nullopt;
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index.reset();
}
}
return res;
}
private:
StorageStripeLog & storage;
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size_t max_read_buffer_size;
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std::shared_ptr<const IndexForNativeFormat> index;
IndexForNativeFormat::Blocks::const_iterator index_begin;
IndexForNativeFormat::Blocks::const_iterator index_end;
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/** optional - чтобы создавать объекты только при первом чтении
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* и удалять объекты (освобождать буферы) после исчерпания источника
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* - для экономии оперативки при использовании большого количества источников.
*/
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bool started = false;
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std::experimental::optional<CompressedReadBufferFromFile> data_in;
std::experimental::optional<NativeBlockInputStream> block_in;
};
class StripeLogBlockOutputStream : public IBlockOutputStream
{
public:
StripeLogBlockOutputStream(StorageStripeLog & storage_)
: storage(storage_), lock(storage.rwlock),
data_out_compressed(storage.full_path() + "data.bin", DBMS_DEFAULT_BUFFER_SIZE, O_WRONLY | O_APPEND | O_CREAT),
data_out(data_out_compressed, CompressionMethod::LZ4, storage.max_compress_block_size),
index_out_compressed(storage.full_path() + "index.mrk", INDEX_BUFFER_SIZE, O_WRONLY | O_APPEND | O_CREAT),
index_out(index_out_compressed),
block_out(data_out, 0, &index_out, Poco::File(storage.full_path() + "data.bin").getSize())
{
}
~StripeLogBlockOutputStream()
{
try
{
writeSuffix();
}
catch (...)
{
tryLogCurrentException(__PRETTY_FUNCTION__);
}
}
void write(const Block & block) override
{
block_out.write(block);
}
void writeSuffix() override
{
if (done)
return;
block_out.writeSuffix();
data_out.next();
data_out_compressed.next();
index_out.next();
index_out_compressed.next();
FileChecker::Files files{ data_out_compressed.getFileName(), index_out_compressed.getFileName() };
storage.file_checker.update(files.begin(), files.end());
done = true;
}
private:
StorageStripeLog & storage;
Poco::ScopedWriteRWLock lock;
WriteBufferFromFile data_out_compressed;
CompressedWriteBuffer data_out;
WriteBufferFromFile index_out_compressed;
CompressedWriteBuffer index_out;
NativeBlockOutputStream block_out;
bool done = false;
};
StorageStripeLog::StorageStripeLog(
const std::string & path_,
const std::string & name_,
NamesAndTypesListPtr columns_,
const NamesAndTypesList & materialized_columns_,
const NamesAndTypesList & alias_columns_,
const ColumnDefaults & column_defaults_,
bool attach,
size_t max_compress_block_size_)
: IStorage{materialized_columns_, alias_columns_, column_defaults_},
path(path_), name(name_), columns(columns_),
max_compress_block_size(max_compress_block_size_),
file_checker(path + escapeForFileName(name) + '/' + "sizes.json"),
log(&Logger::get("StorageStripeLog"))
{
if (columns->empty())
throw Exception("Empty list of columns passed to StorageStripeLog constructor", ErrorCodes::EMPTY_LIST_OF_COLUMNS_PASSED);
String full_path = path + escapeForFileName(name) + '/';
if (!attach)
{
/// создаём файлы, если их нет
if (0 != mkdir(full_path.c_str(), S_IRWXU | S_IRWXG | S_IRWXO) && errno != EEXIST)
throwFromErrno("Cannot create directory " + full_path, ErrorCodes::CANNOT_CREATE_DIRECTORY);
}
}
StoragePtr StorageStripeLog::create(
const std::string & path_,
const std::string & name_,
NamesAndTypesListPtr columns_,
const NamesAndTypesList & materialized_columns_,
const NamesAndTypesList & alias_columns_,
const ColumnDefaults & column_defaults_,
bool attach,
size_t max_compress_block_size_)
{
return (new StorageStripeLog{
path_, name_, columns_,
materialized_columns_, alias_columns_, column_defaults_,
attach, max_compress_block_size_
})->thisPtr();
}
void StorageStripeLog::rename(const String & new_path_to_db, const String & new_database_name, const String & new_table_name)
{
Poco::ScopedWriteRWLock lock(rwlock);
/// Переименовываем директорию с данными.
Poco::File(path + escapeForFileName(name)).renameTo(new_path_to_db + escapeForFileName(new_table_name));
path = new_path_to_db;
name = new_table_name;
file_checker.setPath(path + escapeForFileName(name) + "/" + "sizes.json");
}
BlockInputStreams StorageStripeLog::read(
const Names & column_names,
ASTPtr query,
const Context & context,
const Settings & settings,
QueryProcessingStage::Enum & processed_stage,
const size_t max_block_size,
unsigned threads)
{
Poco::ScopedReadRWLock lock(rwlock);
check(column_names);
processed_stage = QueryProcessingStage::FetchColumns;
NameSet column_names_set(column_names.begin(), column_names.end());
if (!Poco::File(full_path() + "index.mrk").exists())
return { std::make_shared<NullBlockInputStream>() };
CompressedReadBufferFromFile index_in(full_path() + "index.mrk", 0, 0, INDEX_BUFFER_SIZE);
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std::shared_ptr<const IndexForNativeFormat> index{std::make_shared<IndexForNativeFormat>(index_in, column_names_set)};
BlockInputStreams res;
size_t size = index->blocks.size();
if (threads > size)
threads = size;
for (size_t thread = 0; thread < threads; ++thread)
{
IndexForNativeFormat::Blocks::const_iterator begin = index->blocks.begin();
IndexForNativeFormat::Blocks::const_iterator end = index->blocks.begin();
std::advance(begin, thread * size / threads);
std::advance(end, (thread + 1) * size / threads);
res.emplace_back(std::make_shared<StripeLogBlockInputStream>(column_names_set, *this, settings.max_read_buffer_size, index, begin, end));
}
/// Непосредственно во время чтения не держим read lock, потому что мы читаем диапазоны данных, которые не меняются.
return res;
}
BlockOutputStreamPtr StorageStripeLog::write(
ASTPtr query, const Settings & settings)
{
return std::make_shared<StripeLogBlockOutputStream>(*this);
}
bool StorageStripeLog::checkData() const
{
Poco::ScopedReadRWLock lock(const_cast<Poco::RWLock &>(rwlock));
return file_checker.check();
}
}