ClickHouse/src/Interpreters/InterpreterKillQueryQuery.cpp

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#include <Interpreters/InterpreterKillQueryQuery.h>
#include <Parsers/ASTKillQueryQuery.h>
#include <Parsers/queryToString.h>
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#include <Interpreters/Context.h>
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#include <Interpreters/executeDDLQueryOnCluster.h>
#include <Interpreters/ProcessList.h>
#include <Interpreters/executeQuery.h>
#include <Interpreters/CancellationCode.h>
#include <Interpreters/InterpreterAlterQuery.h>
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#include <Interpreters/TransactionLog.h>
#include <Parsers/ASTAlterQuery.h>
#include <Parsers/ParserAlterQuery.h>
#include <Parsers/parseQuery.h>
#include <Access/ContextAccess.h>
#include <Columns/ColumnString.h>
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#include <Common/typeid_cast.h>
#include <DataTypes/DataTypeString.h>
#include <Columns/ColumnsNumber.h>
#include <DataTypes/DataTypesNumber.h>
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#include <Processors/Sources/SourceFromSingleChunk.h>
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#include <Processors/ISource.h>
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#include <Processors/Executors/PullingPipelineExecutor.h>
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#include <QueryPipeline/Pipe.h>
#include <Storages/IStorage.h>
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#include <Common/quoteString.h>
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#include <thread>
#include <iostream>
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#include <cstddef>
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namespace DB
{
namespace ErrorCodes
{
extern const int LOGICAL_ERROR;
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extern const int ACCESS_DENIED;
extern const int NOT_IMPLEMENTED;
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}
static const char * cancellationCodeToStatus(CancellationCode code)
{
switch (code)
{
case CancellationCode::NotFound:
return "finished";
case CancellationCode::QueryIsNotInitializedYet:
return "pending";
case CancellationCode::CancelCannotBeSent:
return "cant_cancel";
case CancellationCode::CancelSent:
return "waiting";
default:
return "unknown_status";
}
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}
struct QueryDescriptor
{
String query_id;
String user;
size_t source_num;
bool processed = false;
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QueryDescriptor(String query_id_, String user_, size_t source_num_, bool processed_ = false)
: query_id(std::move(query_id_)), user(std::move(user_)), source_num(source_num_), processed(processed_) {}
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};
using QueryDescriptors = std::vector<QueryDescriptor>;
static void insertResultRow(size_t n, CancellationCode code, const Block & source, const Block & header, MutableColumns & columns)
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{
columns[0]->insert(cancellationCodeToStatus(code));
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for (size_t col_num = 1, size = columns.size(); col_num < size; ++col_num)
columns[col_num]->insertFrom(*source.getByName(header.getByPosition(col_num).name).column, n);
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}
static QueryDescriptors extractQueriesExceptMeAndCheckAccess(const Block & processes_block, ContextPtr context)
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{
QueryDescriptors res;
size_t num_processes = processes_block.rows();
res.reserve(num_processes);
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const ColumnString & query_id_col = typeid_cast<const ColumnString &>(*processes_block.getByName("query_id").column);
const ColumnString & user_col = typeid_cast<const ColumnString &>(*processes_block.getByName("user").column);
const ClientInfo & my_client = context->getProcessListElement()->getClientInfo();
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bool access_denied = false;
std::optional<bool> is_kill_query_granted_value;
auto is_kill_query_granted = [&]() -> bool
{
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if (!is_kill_query_granted_value)
{
is_kill_query_granted_value = context->getAccess()->isGranted(AccessType::KILL_QUERY);
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if (!*is_kill_query_granted_value)
access_denied = true;
}
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return *is_kill_query_granted_value;
};
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String query_user;
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for (size_t i = 0; i < num_processes; ++i)
{
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if ((my_client.current_query_id == query_id_col.getDataAt(i).toString())
&& (my_client.current_user == user_col.getDataAt(i).toString()))
continue;
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auto query_id = query_id_col.getDataAt(i).toString();
query_user = user_col.getDataAt(i).toString();
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if ((my_client.current_user != query_user) && !is_kill_query_granted())
continue;
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res.emplace_back(std::move(query_id), query_user, i, false);
}
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if (res.empty() && access_denied)
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throw Exception("User " + my_client.current_user + " attempts to kill query created by " + query_user, ErrorCodes::ACCESS_DENIED);
return res;
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}
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class SyncKillQuerySource : public ISource
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{
public:
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SyncKillQuerySource(ProcessList & process_list_, QueryDescriptors && processes_to_stop_, Block && processes_block_,
const Block & res_sample_block_)
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: ISource(res_sample_block_)
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, process_list(process_list_)
, processes_to_stop(std::move(processes_to_stop_))
, processes_block(std::move(processes_block_))
, res_sample_block(res_sample_block_)
{
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addTotalRowsApprox(processes_to_stop.size());
}
String getName() const override
{
return "SynchronousQueryKiller";
}
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Chunk generate() override
{
size_t num_result_queries = processes_to_stop.size();
if (num_processed_queries >= num_result_queries)
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return {};
MutableColumns columns = res_sample_block.cloneEmptyColumns();
do
{
for (auto & curr_process : processes_to_stop)
{
if (curr_process.processed)
continue;
auto code = process_list.sendCancelToQuery(curr_process.query_id, curr_process.user, true);
if (code != CancellationCode::QueryIsNotInitializedYet && code != CancellationCode::CancelSent)
{
curr_process.processed = true;
insertResultRow(curr_process.source_num, code, processes_block, res_sample_block, columns);
++num_processed_queries;
}
/// Wait if CancelSent
}
/// KILL QUERY could be killed also
if (isCancelled())
break;
/// Sleep if there are unprocessed queries
if (num_processed_queries < num_result_queries)
std::this_thread::sleep_for(std::chrono::milliseconds(100));
/// Don't produce empty block
} while (columns.empty() || columns[0]->empty());
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size_t num_rows = columns.empty() ? 0 : columns.front()->size();
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return Chunk(std::move(columns), num_rows);
}
ProcessList & process_list;
QueryDescriptors processes_to_stop;
Block processes_block;
Block res_sample_block;
size_t num_processed_queries = 0;
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};
BlockIO InterpreterKillQueryQuery::execute()
{
const auto & query = query_ptr->as<ASTKillQueryQuery &>();
if (!query.cluster.empty())
{
DDLQueryOnClusterParams params;
params.access_to_check = getRequiredAccessForDDLOnCluster();
return executeDDLQueryOnCluster(query_ptr, getContext(), params);
}
BlockIO res_io;
switch (query.type)
{
case ASTKillQueryQuery::Type::Query:
{
Block processes_block = getSelectResult("query_id, user, query", "system.processes");
if (!processes_block)
return res_io;
ProcessList & process_list = getContext()->getProcessList();
QueryDescriptors queries_to_stop = extractQueriesExceptMeAndCheckAccess(processes_block, getContext());
auto header = processes_block.cloneEmpty();
header.insert(0, {ColumnString::create(), std::make_shared<DataTypeString>(), "kill_status"});
if (!query.sync || query.test)
{
MutableColumns res_columns = header.cloneEmptyColumns();
for (const auto & query_desc : queries_to_stop)
{
auto code = (query.test) ? CancellationCode::Unknown : process_list.sendCancelToQuery(query_desc.query_id, query_desc.user, true);
insertResultRow(query_desc.source_num, code, processes_block, header, res_columns);
}
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res_io.pipeline = QueryPipeline(std::make_shared<SourceFromSingleChunk>(header.cloneWithColumns(std::move(res_columns))));
}
else
{
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res_io.pipeline = QueryPipeline(std::make_shared<SyncKillQuerySource>(
process_list, std::move(queries_to_stop), std::move(processes_block), header));
}
break;
}
case ASTKillQueryQuery::Type::Mutation:
{
Block mutations_block = getSelectResult("database, table, mutation_id, command", "system.mutations");
if (!mutations_block)
return res_io;
const ColumnString & database_col = typeid_cast<const ColumnString &>(*mutations_block.getByName("database").column);
const ColumnString & table_col = typeid_cast<const ColumnString &>(*mutations_block.getByName("table").column);
const ColumnString & mutation_id_col = typeid_cast<const ColumnString &>(*mutations_block.getByName("mutation_id").column);
const ColumnString & command_col = typeid_cast<const ColumnString &>(*mutations_block.getByName("command").column);
auto header = mutations_block.cloneEmpty();
header.insert(0, {ColumnString::create(), std::make_shared<DataTypeString>(), "kill_status"});
MutableColumns res_columns = header.cloneEmptyColumns();
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auto table_id = StorageID::createEmpty();
AccessRightsElements required_access_rights;
auto access = getContext()->getAccess();
bool access_denied = false;
for (size_t i = 0; i < mutations_block.rows(); ++i)
{
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table_id = StorageID{database_col.getDataAt(i).toString(), table_col.getDataAt(i).toString()};
auto mutation_id = mutation_id_col.getDataAt(i).toString();
CancellationCode code = CancellationCode::Unknown;
if (!query.test)
{
auto storage = DatabaseCatalog::instance().tryGetTable(table_id, getContext());
if (!storage)
code = CancellationCode::NotFound;
else
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{
ParserAlterCommand parser;
auto command_ast
= parseQuery(parser, command_col.getDataAt(i).toString(), 0, getContext()->getSettingsRef().max_parser_depth);
required_access_rights = InterpreterAlterQuery::getRequiredAccessForCommand(
command_ast->as<const ASTAlterCommand &>(), table_id.database_name, table_id.table_name);
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if (!access->isGranted(required_access_rights))
{
access_denied = true;
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continue;
}
code = storage->killMutation(mutation_id);
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}
}
insertResultRow(i, code, mutations_block, header, res_columns);
}
if (res_columns[0]->empty() && access_denied)
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throw Exception(
"Not allowed to kill mutation. To execute this query it's necessary to have the grant " + required_access_rights.toString(),
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ErrorCodes::ACCESS_DENIED);
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res_io.pipeline = QueryPipeline(Pipe(std::make_shared<SourceFromSingleChunk>(header.cloneWithColumns(std::move(res_columns)))));
break;
}
case ASTKillQueryQuery::Type::PartMoveToShard:
{
if (query.sync)
throw Exception(ErrorCodes::NOT_IMPLEMENTED, "SYNC modifier is not supported for this statement.");
Block moves_block = getSelectResult(
"database, table, task_name, task_uuid, part_name, to_shard, state",
"system.part_moves_between_shards");
if (!moves_block)
return res_io;
const ColumnString & database_col = typeid_cast<const ColumnString &>(*moves_block.getByName("database").column);
const ColumnString & table_col = typeid_cast<const ColumnString &>(*moves_block.getByName("table").column);
const ColumnUUID & task_uuid_col = typeid_cast<const ColumnUUID &>(*moves_block.getByName("task_uuid").column);
auto header = moves_block.cloneEmpty();
header.insert(0, {ColumnString::create(), std::make_shared<DataTypeString>(), "kill_status"});
MutableColumns res_columns = header.cloneEmptyColumns();
auto table_id = StorageID::createEmpty();
AccessRightsElements required_access_rights;
auto access = getContext()->getAccess();
bool access_denied = false;
for (size_t i = 0; i < moves_block.rows(); ++i)
{
table_id = StorageID{database_col.getDataAt(i).toString(), table_col.getDataAt(i).toString()};
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auto task_uuid = task_uuid_col[i].get<UUID>();
CancellationCode code = CancellationCode::Unknown;
if (!query.test)
{
auto storage = DatabaseCatalog::instance().tryGetTable(table_id, getContext());
if (!storage)
code = CancellationCode::NotFound;
else
{
ASTAlterCommand alter_command{};
alter_command.type = ASTAlterCommand::MOVE_PARTITION;
alter_command.move_destination_type = DataDestinationType::SHARD;
required_access_rights = InterpreterAlterQuery::getRequiredAccessForCommand(
alter_command, table_id.database_name, table_id.table_name);
if (!access->isGranted(required_access_rights))
{
access_denied = true;
continue;
}
code = storage->killPartMoveToShard(task_uuid);
}
}
insertResultRow(i, code, moves_block, header, res_columns);
}
if (res_columns[0]->empty() && access_denied)
throw Exception(
"Not allowed to kill move partition. To execute this query it's necessary to have the grant " + required_access_rights.toString(),
ErrorCodes::ACCESS_DENIED);
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res_io.pipeline = QueryPipeline(Pipe(std::make_shared<SourceFromSingleChunk>(header.cloneWithColumns(std::move(res_columns)))));
break;
}
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case ASTKillQueryQuery::Type::Transaction:
{
getContext()->checkAccess(AccessType::KILL_TRANSACTION);
Block transactions_block = getSelectResult("tid, tid_hash, elapsed, is_readonly, state", "system.transactions");
if (!transactions_block)
return res_io;
const ColumnUInt64 & tid_hash_col = typeid_cast<const ColumnUInt64 &>(*transactions_block.getByName("tid_hash").column);
auto header = transactions_block.cloneEmpty();
header.insert(0, {ColumnString::create(), std::make_shared<DataTypeString>(), "kill_status"});
MutableColumns res_columns = header.cloneEmptyColumns();
for (size_t i = 0; i < transactions_block.rows(); ++i)
{
UInt64 tid_hash = tid_hash_col.getUInt(i);
CancellationCode code = CancellationCode::Unknown;
if (!query.test)
{
auto txn = TransactionLog::instance().tryGetRunningTransaction(tid_hash);
if (txn)
{
txn->onException();
if (txn->getState() == MergeTreeTransaction::ROLLED_BACK)
code = CancellationCode::CancelSent;
else
code = CancellationCode::CancelCannotBeSent;
}
else
{
code = CancellationCode::NotFound;
}
}
insertResultRow(i, code, transactions_block, header, res_columns);
}
res_io.pipeline = QueryPipeline(Pipe(std::make_shared<SourceFromSingleChunk>(header.cloneWithColumns(std::move(res_columns)))));
break;
}
}
return res_io;
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}
Block InterpreterKillQueryQuery::getSelectResult(const String & columns, const String & table)
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{
String select_query = "SELECT " + columns + " FROM " + table;
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auto & where_expression = query_ptr->as<ASTKillQueryQuery>()->where_expression;
if (where_expression)
select_query += " WHERE " + queryToString(where_expression);
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auto io = executeQuery(select_query, getContext(), true);
PullingPipelineExecutor executor(io.pipeline);
Block res;
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while (!res && executor.pull(res));
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Block tmp_block;
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while (executor.pull(tmp_block));
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if (tmp_block)
throw Exception("Expected one block from input stream", ErrorCodes::LOGICAL_ERROR);
return res;
}
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AccessRightsElements InterpreterKillQueryQuery::getRequiredAccessForDDLOnCluster() const
{
const auto & query = query_ptr->as<ASTKillQueryQuery &>();
AccessRightsElements required_access;
if (query.type == ASTKillQueryQuery::Type::Query)
required_access.emplace_back(AccessType::KILL_QUERY);
else if (query.type == ASTKillQueryQuery::Type::Mutation)
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required_access.emplace_back(
AccessType::ALTER_UPDATE
| AccessType::ALTER_DELETE
| AccessType::ALTER_MATERIALIZE_INDEX
| AccessType::ALTER_MATERIALIZE_COLUMN
| AccessType::ALTER_MATERIALIZE_TTL
);
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return required_access;
}
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}