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ClickHouse/src/Interpreters/InterpreterSystemQuery.cpp

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#include <Interpreters/InterpreterSystemQuery.h>
#include <Common/DNSResolver.h>
#include <Common/ActionLock.h>
#include <Common/typeid_cast.h>
#include <Common/getNumberOfPhysicalCPUCores.h>
#include <Common/SymbolIndex.h>
#include <Common/ThreadPool.h>
#include <Common/escapeForFileName.h>
#include <Common/ShellCommand.h>
#include <Interpreters/Cache/FileCacheFactory.h>
#include <Interpreters/Cache/FileCache.h>
#include <Interpreters/Context.h>
#include <Interpreters/DatabaseCatalog.h>
#include <Interpreters/ExternalDictionariesLoader.h>
#include <Interpreters/ExternalModelsLoader.h>
#include <Interpreters/ExternalUserDefinedExecutableFunctionsLoader.h>
#include <Interpreters/EmbeddedDictionaries.h>
#include <Interpreters/ActionLocksManager.h>
#include <Interpreters/InterpreterDropQuery.h>
#include <Interpreters/InterpreterCreateQuery.h>
#include <Interpreters/InterpreterRenameQuery.h>
#include <Interpreters/QueryLog.h>
#include <Interpreters/executeDDLQueryOnCluster.h>
#include <Interpreters/PartLog.h>
#include <Interpreters/QueryThreadLog.h>
#include <Interpreters/QueryViewsLog.h>
#include <Interpreters/SessionLog.h>
#include <Interpreters/TraceLog.h>
#include <Interpreters/TextLog.h>
#include <Interpreters/MetricLog.h>
#include <Interpreters/AsynchronousMetricLog.h>
#include <Interpreters/OpenTelemetrySpanLog.h>
#include <Interpreters/ZooKeeperLog.h>
#include <Interpreters/FilesystemCacheLog.h>
#include <Interpreters/TransactionsInfoLog.h>
#include <Interpreters/ProcessorsProfileLog.h>
#include <Interpreters/JIT/CompiledExpressionCache.h>
#include <Interpreters/TransactionLog.h>
#include <Access/ContextAccess.h>
#include <Access/Common/AllowedClientHosts.h>
#include <Databases/IDatabase.h>
#include <Databases/DatabaseReplicated.h>
#include <Disks/DiskRestartProxy.h>
#include <Storages/StorageDistributed.h>
#include <Storages/StorageReplicatedMergeTree.h>
#include <Storages/Freeze.h>
#include <Storages/StorageFactory.h>
#include <Storages/StorageFile.h>
#include <Storages/StorageS3.h>
#include <Storages/StorageURL.h>
#include <Storages/HDFS/StorageHDFS.h>
#include <Parsers/ASTSystemQuery.h>
#include <Parsers/ASTDropQuery.h>
#include <Parsers/ASTCreateQuery.h>
#include <Common/ThreadFuzzer.h>
#include <csignal>
#include <algorithm>
#include "config_core.h"
namespace DB
{
namespace ErrorCodes
{
extern const int LOGICAL_ERROR;
extern const int BAD_ARGUMENTS;
extern const int CANNOT_KILL;
extern const int NOT_IMPLEMENTED;
extern const int TIMEOUT_EXCEEDED;
extern const int TABLE_WAS_NOT_DROPPED;
}
namespace ActionLocks
{
extern StorageActionBlockType PartsMerge;
extern StorageActionBlockType PartsFetch;
extern StorageActionBlockType PartsSend;
extern StorageActionBlockType ReplicationQueue;
extern StorageActionBlockType DistributedSend;
extern StorageActionBlockType PartsTTLMerge;
extern StorageActionBlockType PartsMove;
}
namespace
{
ExecutionStatus getOverallExecutionStatusOfCommands()
{
return ExecutionStatus(0);
}
/// Consequently tries to execute all commands and generates final exception message for failed commands
template <typename Callable, typename ... Callables>
ExecutionStatus getOverallExecutionStatusOfCommands(Callable && command, Callables && ... commands)
{
ExecutionStatus status_head(0);
try
{
command();
}
catch (...)
{
status_head = ExecutionStatus::fromCurrentException();
}
ExecutionStatus status_tail = getOverallExecutionStatusOfCommands(std::forward<Callables>(commands)...);
auto res_status = status_head.code != 0 ? status_head.code : status_tail.code;
auto res_message = status_head.message + (status_tail.message.empty() ? "" : ("\n" + status_tail.message));
return ExecutionStatus(res_status, res_message);
}
/// Consequently tries to execute all commands and throws exception with info about failed commands
template <typename ... Callables>
void executeCommandsAndThrowIfError(Callables && ... commands)
{
auto status = getOverallExecutionStatusOfCommands(std::forward<Callables>(commands)...);
if (status.code != 0)
throw Exception(status.message, status.code);
}
AccessType getRequiredAccessType(StorageActionBlockType action_type)
{
if (action_type == ActionLocks::PartsMerge)
return AccessType::SYSTEM_MERGES;
else if (action_type == ActionLocks::PartsFetch)
return AccessType::SYSTEM_FETCHES;
else if (action_type == ActionLocks::PartsSend)
return AccessType::SYSTEM_REPLICATED_SENDS;
else if (action_type == ActionLocks::ReplicationQueue)
return AccessType::SYSTEM_REPLICATION_QUEUES;
else if (action_type == ActionLocks::DistributedSend)
return AccessType::SYSTEM_DISTRIBUTED_SENDS;
else if (action_type == ActionLocks::PartsTTLMerge)
return AccessType::SYSTEM_TTL_MERGES;
else if (action_type == ActionLocks::PartsMove)
return AccessType::SYSTEM_MOVES;
else
throw Exception("Unknown action type: " + std::to_string(action_type), ErrorCodes::LOGICAL_ERROR);
}
constexpr std::string_view table_is_not_replicated = "Table {} is not replicated";
}
/// Implements SYSTEM [START|STOP] <something action from ActionLocks>
void InterpreterSystemQuery::startStopAction(StorageActionBlockType action_type, bool start)
{
auto manager = getContext()->getActionLocksManager();
manager->cleanExpired();
auto access = getContext()->getAccess();
auto required_access_type = getRequiredAccessType(action_type);
if (volume_ptr && action_type == ActionLocks::PartsMerge)
{
access->checkAccess(required_access_type);
volume_ptr->setAvoidMergesUserOverride(!start);
}
else if (table_id)
{
access->checkAccess(required_access_type, table_id.database_name, table_id.table_name);
auto table = DatabaseCatalog::instance().tryGetTable(table_id, getContext());
if (table)
{
if (start)
{
manager->remove(table, action_type);
table->onActionLockRemove(action_type);
}
else
manager->add(table, action_type);
}
}
else
{
for (auto & elem : DatabaseCatalog::instance().getDatabases())
{
for (auto iterator = elem.second->getTablesIterator(getContext()); iterator->isValid(); iterator->next())
{
StoragePtr table = iterator->table();
if (!table)
continue;
if (!access->isGranted(required_access_type, elem.first, iterator->name()))
{
LOG_INFO(log, "Access {} denied, skipping {}.{}", toString(required_access_type), elem.first, iterator->name());
continue;
}
if (start)
{
manager->remove(table, action_type);
table->onActionLockRemove(action_type);
}
else
manager->add(table, action_type);
}
}
}
}
InterpreterSystemQuery::InterpreterSystemQuery(const ASTPtr & query_ptr_, ContextMutablePtr context_)
: WithMutableContext(context_), query_ptr(query_ptr_->clone()), log(&Poco::Logger::get("InterpreterSystemQuery"))
{
}
BlockIO InterpreterSystemQuery::execute()
{
auto & query = query_ptr->as<ASTSystemQuery &>();
if (!query.cluster.empty())
{
DDLQueryOnClusterParams params;
params.access_to_check = getRequiredAccessForDDLOnCluster();
return executeDDLQueryOnCluster(query_ptr, getContext(), params);
}
using Type = ASTSystemQuery::Type;
/// Use global context with fresh system profile settings
auto system_context = Context::createCopy(getContext()->getGlobalContext());
system_context->setSetting("profile", getContext()->getSystemProfileName());
/// Make canonical query for simpler processing
if (query.type == Type::RELOAD_DICTIONARY)
{
if (query.database)
query.setTable(query.getDatabase() + "." + query.getTable());
}
else if (query.table)
{
table_id = getContext()->resolveStorageID(StorageID(query.getDatabase(), query.getTable()), Context::ResolveOrdinary);
}
BlockIO result;
volume_ptr = {};
if (!query.storage_policy.empty() && !query.volume.empty())
volume_ptr = getContext()->getStoragePolicy(query.storage_policy)->getVolumeByName(query.volume);
switch (query.type)
{
case Type::SHUTDOWN:
{
getContext()->checkAccess(AccessType::SYSTEM_SHUTDOWN);
if (kill(0, SIGTERM))
throwFromErrno("System call kill(0, SIGTERM) failed", ErrorCodes::CANNOT_KILL);
break;
}
case Type::KILL:
{
getContext()->checkAccess(AccessType::SYSTEM_SHUTDOWN);
/// Exit with the same code as it is usually set by shell when process is terminated by SIGKILL.
/// It's better than doing 'raise' or 'kill', because they have no effect for 'init' process (with pid = 0, usually in Docker).
LOG_INFO(log, "Exit immediately as the SYSTEM KILL command has been issued.");
_exit(128 + SIGKILL);
// break; /// unreachable
}
case Type::SUSPEND:
{
getContext()->checkAccess(AccessType::SYSTEM_SHUTDOWN);
auto command = fmt::format("kill -STOP {0} && sleep {1} && kill -CONT {0}", getpid(), query.seconds);
LOG_DEBUG(log, "Will run {}", command);
auto res = ShellCommand::execute(command);
res->in.close();
WriteBufferFromOwnString out;
copyData(res->out, out);
copyData(res->err, out);
if (!out.str().empty())
LOG_DEBUG(log, "The command returned output: {}", command, out.str());
res->wait();
break;
}
case Type::DROP_DNS_CACHE:
{
getContext()->checkAccess(AccessType::SYSTEM_DROP_DNS_CACHE);
DNSResolver::instance().dropCache();
/// Reinitialize clusters to update their resolved_addresses
system_context->reloadClusterConfig();
break;
}
case Type::DROP_MARK_CACHE:
getContext()->checkAccess(AccessType::SYSTEM_DROP_MARK_CACHE);
system_context->dropMarkCache();
break;
case Type::DROP_UNCOMPRESSED_CACHE:
getContext()->checkAccess(AccessType::SYSTEM_DROP_UNCOMPRESSED_CACHE);
system_context->dropUncompressedCache();
break;
case Type::DROP_INDEX_MARK_CACHE:
getContext()->checkAccess(AccessType::SYSTEM_DROP_MARK_CACHE);
system_context->dropIndexMarkCache();
break;
case Type::DROP_INDEX_UNCOMPRESSED_CACHE:
getContext()->checkAccess(AccessType::SYSTEM_DROP_UNCOMPRESSED_CACHE);
system_context->dropIndexUncompressedCache();
break;
case Type::DROP_MMAP_CACHE:
getContext()->checkAccess(AccessType::SYSTEM_DROP_MMAP_CACHE);
system_context->dropMMappedFileCache();
break;
#if USE_EMBEDDED_COMPILER
case Type::DROP_COMPILED_EXPRESSION_CACHE:
getContext()->checkAccess(AccessType::SYSTEM_DROP_COMPILED_EXPRESSION_CACHE);
if (auto * cache = CompiledExpressionCacheFactory::instance().tryGetCache())
cache->reset();
break;
#endif
case Type::DROP_FILESYSTEM_CACHE:
{
getContext()->checkAccess(AccessType::SYSTEM_DROP_FILESYSTEM_CACHE);
if (query.filesystem_cache_path.empty())
{
auto caches = FileCacheFactory::instance().getAll();
for (const auto & [_, cache_data] : caches)
cache_data->cache->removeIfReleasable();
}
else
{
auto cache = FileCacheFactory::instance().get(query.filesystem_cache_path);
cache->removeIfReleasable();
}
break;
}
case Type::DROP_SCHEMA_CACHE:
{
getContext()->checkAccess(AccessType::SYSTEM_DROP_SCHEMA_CACHE);
std::unordered_set<String> caches_to_drop;
if (query.schema_cache_storage.empty())
caches_to_drop = {"FILE", "S3", "HDFS", "URL"};
else
caches_to_drop = {query.schema_cache_storage};
if (caches_to_drop.contains("FILE"))
StorageFile::getSchemaCache(getContext()).clear();
#if USE_AWS_S3
if (caches_to_drop.contains("S3"))
StorageS3::getSchemaCache(getContext()).clear();
#endif
#if USE_HDFS
if (caches_to_drop.contains("HDFS"))
StorageHDFS::getSchemaCache(getContext()).clear();
#endif
if (caches_to_drop.contains("URL"))
StorageURL::getSchemaCache(getContext()).clear();
break;
}
case Type::RELOAD_DICTIONARY:
{
getContext()->checkAccess(AccessType::SYSTEM_RELOAD_DICTIONARY);
auto & external_dictionaries_loader = system_context->getExternalDictionariesLoader();
external_dictionaries_loader.reloadDictionary(query.getTable(), getContext());
ExternalDictionariesLoader::resetAll();
break;
}
case Type::RELOAD_DICTIONARIES:
{
getContext()->checkAccess(AccessType::SYSTEM_RELOAD_DICTIONARY);
executeCommandsAndThrowIfError(
[&] { system_context->getExternalDictionariesLoader().reloadAllTriedToLoad(); },
[&] { system_context->getEmbeddedDictionaries().reload(); }
);
ExternalDictionariesLoader::resetAll();
break;
}
case Type::RELOAD_MODEL:
{
getContext()->checkAccess(AccessType::SYSTEM_RELOAD_MODEL);
auto & external_models_loader = system_context->getExternalModelsLoader();
external_models_loader.reloadModel(query.target_model);
break;
}
case Type::RELOAD_MODELS:
{
getContext()->checkAccess(AccessType::SYSTEM_RELOAD_MODEL);
auto & external_models_loader = system_context->getExternalModelsLoader();
external_models_loader.reloadAllTriedToLoad();
break;
}
case Type::RELOAD_FUNCTION:
{
getContext()->checkAccess(AccessType::SYSTEM_RELOAD_FUNCTION);
auto & external_user_defined_executable_functions_loader = system_context->getExternalUserDefinedExecutableFunctionsLoader();
external_user_defined_executable_functions_loader.reloadFunction(query.target_function);
break;
}
case Type::RELOAD_FUNCTIONS:
{
getContext()->checkAccess(AccessType::SYSTEM_RELOAD_FUNCTION);
auto & external_user_defined_executable_functions_loader = system_context->getExternalUserDefinedExecutableFunctionsLoader();
external_user_defined_executable_functions_loader.reloadAllTriedToLoad();
break;
}
case Type::RELOAD_EMBEDDED_DICTIONARIES:
getContext()->checkAccess(AccessType::SYSTEM_RELOAD_EMBEDDED_DICTIONARIES);
system_context->getEmbeddedDictionaries().reload();
break;
case Type::RELOAD_CONFIG:
getContext()->checkAccess(AccessType::SYSTEM_RELOAD_CONFIG);
system_context->reloadConfig();
break;
case Type::RELOAD_SYMBOLS:
{
#if defined(__ELF__) && !defined(OS_FREEBSD)
getContext()->checkAccess(AccessType::SYSTEM_RELOAD_SYMBOLS);
SymbolIndex::reload();
break;
#else
throw Exception("SYSTEM RELOAD SYMBOLS is not supported on current platform", ErrorCodes::NOT_IMPLEMENTED);
#endif
}
case Type::STOP_MERGES:
startStopAction(ActionLocks::PartsMerge, false);
break;
case Type::START_MERGES:
startStopAction(ActionLocks::PartsMerge, true);
break;
case Type::STOP_TTL_MERGES:
startStopAction(ActionLocks::PartsTTLMerge, false);
break;
case Type::START_TTL_MERGES:
startStopAction(ActionLocks::PartsTTLMerge, true);
break;
case Type::STOP_MOVES:
startStopAction(ActionLocks::PartsMove, false);
break;
case Type::START_MOVES:
startStopAction(ActionLocks::PartsMove, true);
break;
case Type::STOP_FETCHES:
startStopAction(ActionLocks::PartsFetch, false);
break;
case Type::START_FETCHES:
startStopAction(ActionLocks::PartsFetch, true);
break;
case Type::STOP_REPLICATED_SENDS:
startStopAction(ActionLocks::PartsSend, false);
break;
case Type::START_REPLICATED_SENDS:
startStopAction(ActionLocks::PartsSend, true);
break;
case Type::STOP_REPLICATION_QUEUES:
startStopAction(ActionLocks::ReplicationQueue, false);
break;
case Type::START_REPLICATION_QUEUES:
startStopAction(ActionLocks::ReplicationQueue, true);
break;
case Type::STOP_DISTRIBUTED_SENDS:
startStopAction(ActionLocks::DistributedSend, false);
break;
case Type::START_DISTRIBUTED_SENDS:
startStopAction(ActionLocks::DistributedSend, true);
break;
case Type::DROP_REPLICA:
dropReplica(query);
break;
case Type::SYNC_REPLICA:
syncReplica(query);
break;
case Type::SYNC_DATABASE_REPLICA:
syncReplicatedDatabase(query);
break;
case Type::SYNC_TRANSACTION_LOG:
syncTransactionLog();
break;
case Type::FLUSH_DISTRIBUTED:
flushDistributed(query);
break;
case Type::RESTART_REPLICAS:
restartReplicas(system_context);
break;
case Type::RESTART_REPLICA:
restartReplica(table_id, system_context);
break;
case Type::RESTORE_REPLICA:
restoreReplica();
break;
case Type::RESTART_DISK:
restartDisk(query.disk);
break;
case Type::FLUSH_LOGS:
{
getContext()->checkAccess(AccessType::SYSTEM_FLUSH_LOGS);
executeCommandsAndThrowIfError(
[&] { if (auto query_log = getContext()->getQueryLog()) query_log->flush(true); },
[&] { if (auto part_log = getContext()->getPartLog("")) part_log->flush(true); },
[&] { if (auto query_thread_log = getContext()->getQueryThreadLog()) query_thread_log->flush(true); },
[&] { if (auto trace_log = getContext()->getTraceLog()) trace_log->flush(true); },
[&] { if (auto text_log = getContext()->getTextLog()) text_log->flush(true); },
[&] { if (auto metric_log = getContext()->getMetricLog()) metric_log->flush(true); },
[&] { if (auto asynchronous_metric_log = getContext()->getAsynchronousMetricLog()) asynchronous_metric_log->flush(true); },
[&] { if (auto opentelemetry_span_log = getContext()->getOpenTelemetrySpanLog()) opentelemetry_span_log->flush(true); },
[&] { if (auto query_views_log = getContext()->getQueryViewsLog()) query_views_log->flush(true); },
[&] { if (auto zookeeper_log = getContext()->getZooKeeperLog()) zookeeper_log->flush(true); },
[&] { if (auto session_log = getContext()->getSessionLog()) session_log->flush(true); },
[&] { if (auto transactions_info_log = getContext()->getTransactionsInfoLog()) transactions_info_log->flush(true); },
[&] { if (auto processors_profile_log = getContext()->getProcessorsProfileLog()) processors_profile_log->flush(true); },
[&] { if (auto cache_log = getContext()->getFilesystemCacheLog()) cache_log->flush(true); }
);
break;
}
case Type::STOP_LISTEN_QUERIES:
case Type::START_LISTEN_QUERIES:
throw Exception(ErrorCodes::NOT_IMPLEMENTED, "{} is not supported yet", query.type);
case Type::STOP_THREAD_FUZZER:
getContext()->checkAccess(AccessType::SYSTEM_THREAD_FUZZER);
ThreadFuzzer::stop();
break;
case Type::START_THREAD_FUZZER:
getContext()->checkAccess(AccessType::SYSTEM_THREAD_FUZZER);
ThreadFuzzer::start();
break;
case Type::UNFREEZE:
{
getContext()->checkAccess(AccessType::SYSTEM_UNFREEZE);
/// The result contains information about deleted parts as a table. It is for compatibility with ALTER TABLE UNFREEZE query.
result = Unfreezer(getContext()).systemUnfreeze(query.backup_name);
break;
}
default:
throw Exception("Unknown type of SYSTEM query", ErrorCodes::BAD_ARGUMENTS);
}
return result;
}
void InterpreterSystemQuery::restoreReplica()
{
getContext()->checkAccess(AccessType::SYSTEM_RESTORE_REPLICA, table_id);
const StoragePtr table_ptr = DatabaseCatalog::instance().getTable(table_id, getContext());
auto * const table_replicated_ptr = dynamic_cast<StorageReplicatedMergeTree *>(table_ptr.get());
if (table_replicated_ptr == nullptr)
throw Exception(ErrorCodes::BAD_ARGUMENTS, table_is_not_replicated.data(), table_id.getNameForLogs());
table_replicated_ptr->restoreMetadataInZooKeeper();
}
StoragePtr InterpreterSystemQuery::tryRestartReplica(const StorageID & replica, ContextMutablePtr system_context, bool need_ddl_guard)
{
auto table_ddl_guard = need_ddl_guard
? DatabaseCatalog::instance().getDDLGuard(replica.getDatabaseName(), replica.getTableName())
: nullptr;
auto [database, table] = DatabaseCatalog::instance().tryGetDatabaseAndTable(replica, getContext());
ASTPtr create_ast;
/// Detach actions
if (!table || !dynamic_cast<const StorageReplicatedMergeTree *>(table.get()))
return nullptr;
table->flushAndShutdown();
{
/// If table was already dropped by anyone, an exception will be thrown
auto table_lock = table->lockExclusively(getContext()->getCurrentQueryId(), getContext()->getSettingsRef().lock_acquire_timeout);
create_ast = database->getCreateTableQuery(replica.table_name, getContext());
database->detachTable(system_context, replica.table_name);
}
UUID uuid = table->getStorageID().uuid;
table.reset();
database->waitDetachedTableNotInUse(uuid);
/// Attach actions
/// getCreateTableQuery must return canonical CREATE query representation, there are no need for AST postprocessing
auto & create = create_ast->as<ASTCreateQuery &>();
create.attach = true;
auto columns = InterpreterCreateQuery::getColumnsDescription(*create.columns_list->columns, system_context, true);
auto constraints = InterpreterCreateQuery::getConstraintsDescription(create.columns_list->constraints);
auto data_path = database->getTableDataPath(create);
table = StorageFactory::instance().get(create,
data_path,
system_context,
system_context->getGlobalContext(),
columns,
constraints,
false);
database->attachTable(system_context, replica.table_name, table, data_path);
table->startup();
return table;
}
void InterpreterSystemQuery::restartReplica(const StorageID & replica, ContextMutablePtr system_context)
{
getContext()->checkAccess(AccessType::SYSTEM_RESTART_REPLICA, replica);
if (!tryRestartReplica(replica, system_context))
throw Exception(ErrorCodes::BAD_ARGUMENTS, table_is_not_replicated.data(), replica.getNameForLogs());
}
void InterpreterSystemQuery::restartReplicas(ContextMutablePtr system_context)
{
std::vector<StorageID> replica_names;
auto & catalog = DatabaseCatalog::instance();
auto access = getContext()->getAccess();
bool access_is_granted_globally = access->isGranted(AccessType::SYSTEM_RESTART_REPLICA);
for (auto & elem : catalog.getDatabases())
{
for (auto it = elem.second->getTablesIterator(getContext()); it->isValid(); it->next())
{
if (dynamic_cast<const StorageReplicatedMergeTree *>(it->table().get()))
{
if (!access_is_granted_globally && !access->isGranted(AccessType::SYSTEM_RESTART_REPLICA, elem.first, it->name()))
{
LOG_INFO(log, "Access {} denied, skipping {}.{}", "SYSTEM RESTART REPLICA", elem.first, it->name());
continue;
}
replica_names.emplace_back(it->databaseName(), it->name());
}
}
}
if (replica_names.empty())
return;
TableGuards guards;
for (const auto & name : replica_names)
guards.emplace(UniqueTableName{name.database_name, name.table_name}, nullptr);
for (auto & guard : guards)
guard.second = catalog.getDDLGuard(guard.first.database_name, guard.first.table_name);
ThreadPool pool(std::min(static_cast<size_t>(getNumberOfPhysicalCPUCores()), replica_names.size()));
for (auto & replica : replica_names)
{
LOG_TRACE(log, "Restarting replica on {}", replica.getNameForLogs());
pool.scheduleOrThrowOnError([&]() { tryRestartReplica(replica, system_context, false); });
}
pool.wait();
}
void InterpreterSystemQuery::dropReplica(ASTSystemQuery & query)
{
if (query.replica.empty())
throw Exception("Replica name is empty", ErrorCodes::BAD_ARGUMENTS);
if (!table_id.empty())
{
getContext()->checkAccess(AccessType::SYSTEM_DROP_REPLICA, table_id);
StoragePtr table = DatabaseCatalog::instance().getTable(table_id, getContext());
if (!dropReplicaImpl(query, table))
throw Exception(ErrorCodes::BAD_ARGUMENTS, table_is_not_replicated.data(), table_id.getNameForLogs());
}
else if (query.database)
{
getContext()->checkAccess(AccessType::SYSTEM_DROP_REPLICA, query.getDatabase());
DatabasePtr database = DatabaseCatalog::instance().getDatabase(query.getDatabase());
for (auto iterator = database->getTablesIterator(getContext()); iterator->isValid(); iterator->next())
dropReplicaImpl(query, iterator->table());
LOG_TRACE(log, "Dropped replica {} from database {}", query.replica, backQuoteIfNeed(database->getDatabaseName()));
}
else if (query.is_drop_whole_replica)
{
auto databases = DatabaseCatalog::instance().getDatabases();
auto access = getContext()->getAccess();
bool access_is_granted_globally = access->isGranted(AccessType::SYSTEM_DROP_REPLICA);
for (auto & elem : databases)
{
DatabasePtr & database = elem.second;
for (auto iterator = database->getTablesIterator(getContext()); iterator->isValid(); iterator->next())
{
if (!access_is_granted_globally && !access->isGranted(AccessType::SYSTEM_DROP_REPLICA, elem.first, iterator->name()))
{
LOG_INFO(log, "Access {} denied, skipping {}.{}", "SYSTEM DROP REPLICA", elem.first, iterator->name());
continue;
}
dropReplicaImpl(query, iterator->table());
}
LOG_TRACE(log, "Dropped replica {} from database {}", query.replica, backQuoteIfNeed(database->getDatabaseName()));
}
}
else if (!query.replica_zk_path.empty())
{
getContext()->checkAccess(AccessType::SYSTEM_DROP_REPLICA);
String remote_replica_path = fs::path(query.replica_zk_path) / "replicas" / query.replica;
/// This check is actually redundant, but it may prevent from some user mistakes
for (auto & elem : DatabaseCatalog::instance().getDatabases())
{
DatabasePtr & database = elem.second;
for (auto iterator = database->getTablesIterator(getContext()); iterator->isValid(); iterator->next())
{
if (auto * storage_replicated = dynamic_cast<StorageReplicatedMergeTree *>(iterator->table().get()))
{
StorageReplicatedMergeTree::Status status;
storage_replicated->getStatus(status);
if (status.zookeeper_path == query.replica_zk_path)
throw Exception("There is a local table " + storage_replicated->getStorageID().getNameForLogs() +
", which has the same table path in ZooKeeper. Please check the path in query. "
"If you want to drop replica of this table, use `DROP TABLE` "
"or `SYSTEM DROP REPLICA 'name' FROM db.table`", ErrorCodes::TABLE_WAS_NOT_DROPPED);
}
}
}
auto zookeeper = getContext()->getZooKeeper();
bool looks_like_table_path = zookeeper->exists(query.replica_zk_path + "/replicas") ||
zookeeper->exists(query.replica_zk_path + "/dropped");
if (!looks_like_table_path)
throw Exception("Specified path " + query.replica_zk_path + " does not look like a table path",
ErrorCodes::TABLE_WAS_NOT_DROPPED);
if (zookeeper->exists(remote_replica_path + "/is_active"))
throw Exception("Can't remove replica: " + query.replica + ", because it's active",
ErrorCodes::TABLE_WAS_NOT_DROPPED);
StorageReplicatedMergeTree::dropReplica(zookeeper, query.replica_zk_path, query.replica, log);
LOG_INFO(log, "Dropped replica {}", remote_replica_path);
}
else
throw Exception("Invalid query", ErrorCodes::LOGICAL_ERROR);
}
bool InterpreterSystemQuery::dropReplicaImpl(ASTSystemQuery & query, const StoragePtr & table)
{
auto * storage_replicated = dynamic_cast<StorageReplicatedMergeTree *>(table.get());
if (!storage_replicated)
return false;
StorageReplicatedMergeTree::Status status;
auto zookeeper = getContext()->getZooKeeper();
storage_replicated->getStatus(status);
/// Do not allow to drop local replicas and active remote replicas
if (query.replica == status.replica_name)
throw Exception("We can't drop local replica, please use `DROP TABLE` "
"if you want to clean the data and drop this replica", ErrorCodes::TABLE_WAS_NOT_DROPPED);
/// NOTE it's not atomic: replica may become active after this check, but before dropReplica(...)
/// However, the main usecase is to drop dead replica, which cannot become active.
/// This check prevents only from accidental drop of some other replica.
if (zookeeper->exists(status.zookeeper_path + "/replicas/" + query.replica + "/is_active"))
throw Exception("Can't drop replica: " + query.replica + ", because it's active",
ErrorCodes::TABLE_WAS_NOT_DROPPED);
storage_replicated->dropReplica(zookeeper, status.zookeeper_path, query.replica, log);
LOG_TRACE(log, "Dropped replica {} of {}", query.replica, table->getStorageID().getNameForLogs());
return true;
}
void InterpreterSystemQuery::syncReplica(ASTSystemQuery &)
{
getContext()->checkAccess(AccessType::SYSTEM_SYNC_REPLICA, table_id);
StoragePtr table = DatabaseCatalog::instance().getTable(table_id, getContext());
if (auto * storage_replicated = dynamic_cast<StorageReplicatedMergeTree *>(table.get()))
{
LOG_TRACE(log, "Synchronizing entries in replica's queue with table's log and waiting for it to become empty");
if (!storage_replicated->waitForShrinkingQueueSize(0, getContext()->getSettingsRef().receive_timeout.totalMilliseconds()))
{
LOG_ERROR(log, "SYNC REPLICA {}: Timed out!", table_id.getNameForLogs());
throw Exception(ErrorCodes::TIMEOUT_EXCEEDED, "SYNC REPLICA {}: command timed out. " \
"See the 'receive_timeout' setting", table_id.getNameForLogs());
}
LOG_TRACE(log, "SYNC REPLICA {}: OK", table_id.getNameForLogs());
}
else
throw Exception(ErrorCodes::BAD_ARGUMENTS, table_is_not_replicated.data(), table_id.getNameForLogs());
}
void InterpreterSystemQuery::syncReplicatedDatabase(ASTSystemQuery & query)
{
const auto database_name = query.getDatabase();
auto guard = DatabaseCatalog::instance().getDDLGuard(database_name, "");
auto database = DatabaseCatalog::instance().getDatabase(database_name);
if (auto * ptr = typeid_cast<DatabaseReplicated *>(database.get()))
{
LOG_TRACE(log, "Synchronizing entries in the database replica's (name: {}) queue with the log", database_name);
if (!ptr->waitForReplicaToProcessAllEntries(getContext()->getSettingsRef().receive_timeout.totalMilliseconds()))
{
throw Exception(ErrorCodes::TIMEOUT_EXCEEDED, "SYNC DATABASE REPLICA {}: database is readonly or command timed out. " \
"See the 'receive_timeout' setting", database_name);
}
LOG_TRACE(log, "SYNC DATABASE REPLICA {}: OK", database_name);
}
else
throw Exception(ErrorCodes::BAD_ARGUMENTS, "SYSTEM SYNC DATABASE REPLICA query is intended to work only with Replicated engine");
}
void InterpreterSystemQuery::syncTransactionLog()
{
getContext()->checkTransactionsAreAllowed(/* explicit_tcl_query */ true);
TransactionLog::instance().sync();
}
void InterpreterSystemQuery::flushDistributed(ASTSystemQuery &)
{
getContext()->checkAccess(AccessType::SYSTEM_FLUSH_DISTRIBUTED, table_id);
if (auto * storage_distributed = dynamic_cast<StorageDistributed *>(DatabaseCatalog::instance().getTable(table_id, getContext()).get()))
storage_distributed->flushClusterNodesAllData(getContext());
else
throw Exception("Table " + table_id.getNameForLogs() + " is not distributed", ErrorCodes::BAD_ARGUMENTS);
}
void InterpreterSystemQuery::restartDisk(String & name)
{
getContext()->checkAccess(AccessType::SYSTEM_RESTART_DISK);
auto disk = getContext()->getDisk(name);
if (DiskRestartProxy * restart_proxy = dynamic_cast<DiskRestartProxy*>(disk.get()))
restart_proxy->restart(getContext());
else
throw Exception("Disk " + name + " doesn't have possibility to restart", ErrorCodes::BAD_ARGUMENTS);
}
AccessRightsElements InterpreterSystemQuery::getRequiredAccessForDDLOnCluster() const
{
const auto & query = query_ptr->as<const ASTSystemQuery &>();
using Type = ASTSystemQuery::Type;
AccessRightsElements required_access;
switch (query.type)
{
case Type::SHUTDOWN:
case Type::KILL:
case Type::SUSPEND:
{
required_access.emplace_back(AccessType::SYSTEM_SHUTDOWN);
break;
}
case Type::DROP_DNS_CACHE:
case Type::DROP_MARK_CACHE:
case Type::DROP_MMAP_CACHE:
#if USE_EMBEDDED_COMPILER
case Type::DROP_COMPILED_EXPRESSION_CACHE:
#endif
case Type::DROP_UNCOMPRESSED_CACHE:
case Type::DROP_INDEX_MARK_CACHE:
case Type::DROP_INDEX_UNCOMPRESSED_CACHE:
case Type::DROP_FILESYSTEM_CACHE:
case Type::DROP_SCHEMA_CACHE:
{
required_access.emplace_back(AccessType::SYSTEM_DROP_CACHE);
break;
}
case Type::RELOAD_DICTIONARY:
case Type::RELOAD_DICTIONARIES:
case Type::RELOAD_EMBEDDED_DICTIONARIES:
{
required_access.emplace_back(AccessType::SYSTEM_RELOAD_DICTIONARY);
break;
}
case Type::RELOAD_MODEL:
case Type::RELOAD_MODELS:
{
required_access.emplace_back(AccessType::SYSTEM_RELOAD_MODEL);
break;
}
case Type::RELOAD_FUNCTION:
case Type::RELOAD_FUNCTIONS:
{
required_access.emplace_back(AccessType::SYSTEM_RELOAD_FUNCTION);
break;
}
case Type::RELOAD_CONFIG:
{
required_access.emplace_back(AccessType::SYSTEM_RELOAD_CONFIG);
break;
}
case Type::RELOAD_SYMBOLS:
{
required_access.emplace_back(AccessType::SYSTEM_RELOAD_SYMBOLS);
break;
}
case Type::STOP_MERGES:
case Type::START_MERGES:
{
if (!query.table)
required_access.emplace_back(AccessType::SYSTEM_MERGES);
else
required_access.emplace_back(AccessType::SYSTEM_MERGES, query.getDatabase(), query.getTable());
break;
}
case Type::STOP_TTL_MERGES:
case Type::START_TTL_MERGES:
{
if (!query.table)
required_access.emplace_back(AccessType::SYSTEM_TTL_MERGES);
else
required_access.emplace_back(AccessType::SYSTEM_TTL_MERGES, query.getDatabase(), query.getTable());
break;
}
case Type::STOP_MOVES:
case Type::START_MOVES:
{
if (!query.table)
required_access.emplace_back(AccessType::SYSTEM_MOVES);
else
required_access.emplace_back(AccessType::SYSTEM_MOVES, query.getDatabase(), query.getTable());
break;
}
case Type::STOP_FETCHES:
case Type::START_FETCHES:
{
if (!query.table)
required_access.emplace_back(AccessType::SYSTEM_FETCHES);
else
required_access.emplace_back(AccessType::SYSTEM_FETCHES, query.getDatabase(), query.getTable());
break;
}
case Type::STOP_DISTRIBUTED_SENDS:
case Type::START_DISTRIBUTED_SENDS:
{
if (!query.table)
required_access.emplace_back(AccessType::SYSTEM_DISTRIBUTED_SENDS);
else
required_access.emplace_back(AccessType::SYSTEM_DISTRIBUTED_SENDS, query.getDatabase(), query.getTable());
break;
}
case Type::STOP_REPLICATED_SENDS:
case Type::START_REPLICATED_SENDS:
{
if (!query.table)
required_access.emplace_back(AccessType::SYSTEM_REPLICATED_SENDS);
else
required_access.emplace_back(AccessType::SYSTEM_REPLICATED_SENDS, query.getDatabase(), query.getTable());
break;
}
case Type::STOP_REPLICATION_QUEUES:
case Type::START_REPLICATION_QUEUES:
{
if (!query.table)
required_access.emplace_back(AccessType::SYSTEM_REPLICATION_QUEUES);
else
required_access.emplace_back(AccessType::SYSTEM_REPLICATION_QUEUES, query.getDatabase(), query.getTable());
break;
}
case Type::DROP_REPLICA:
{
required_access.emplace_back(AccessType::SYSTEM_DROP_REPLICA, query.getDatabase(), query.getTable());
break;
}
case Type::RESTORE_REPLICA:
{
required_access.emplace_back(AccessType::SYSTEM_RESTORE_REPLICA, query.getDatabase(), query.getTable());
break;
}
case Type::SYNC_REPLICA:
{
required_access.emplace_back(AccessType::SYSTEM_SYNC_REPLICA, query.getDatabase(), query.getTable());
break;
}
case Type::RESTART_REPLICA:
{
required_access.emplace_back(AccessType::SYSTEM_RESTART_REPLICA, query.getDatabase(), query.getTable());
break;
}
case Type::RESTART_REPLICAS:
{
required_access.emplace_back(AccessType::SYSTEM_RESTART_REPLICA);
break;
}
case Type::SYNC_DATABASE_REPLICA:
{
required_access.emplace_back(AccessType::SYSTEM_SYNC_DATABASE_REPLICA, query.getDatabase());
break;
}
case Type::SYNC_TRANSACTION_LOG:
{
required_access.emplace_back(AccessType::SYSTEM_SYNC_TRANSACTION_LOG);
break;
}
case Type::FLUSH_DISTRIBUTED:
{
required_access.emplace_back(AccessType::SYSTEM_FLUSH_DISTRIBUTED, query.getDatabase(), query.getTable());
break;
}
case Type::FLUSH_LOGS:
{
required_access.emplace_back(AccessType::SYSTEM_FLUSH_LOGS);
break;
}
case Type::RESTART_DISK:
{
required_access.emplace_back(AccessType::SYSTEM_RESTART_DISK);
break;
}
case Type::UNFREEZE:
{
required_access.emplace_back(AccessType::SYSTEM_UNFREEZE);
break;
}
case Type::STOP_LISTEN_QUERIES:
case Type::START_LISTEN_QUERIES:
case Type::STOP_THREAD_FUZZER:
case Type::START_THREAD_FUZZER:
case Type::UNKNOWN:
case Type::END: break;
}
return required_access;
}
void InterpreterSystemQuery::extendQueryLogElemImpl(QueryLogElement & elem, const ASTPtr & /*ast*/, ContextPtr) const
{
elem.query_kind = "System";
}
}
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