ClickHouse/src/Storages/Freeze.cpp

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#include <Storages/Freeze.h>
#include <Disks/ObjectStorages/IMetadataStorage.h>
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#include <Storages/PartitionCommands.h>
#include <Common/escapeForFileName.h>
#include <Common/logger_useful.h>
/**
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* When ClickHouse has frozen data on remote storage it required 'smart' data removing during UNFREEZE.
* For remote storage actually frozen not remote data but local metadata with referrers on remote data.
* So remote data can be referred from working and frozen data sets (or two frozen) at same time.
* In this case during UNFREEZE ClickHouse should remove only local metadata and keep remote data.
* But when data was already removed from working data set ClickHouse should remove remote data too.
* To detect is current data used or not in some other place ClickHouse uses
* - ref_count from metadata to check if data used in some other metadata on the same replica;
* - Keeper record to check if data used on other replica.
* StorageReplicatedMergeTree::removeSharedDetachedPart makes required checks, so here this method
* called for each frozen part.
*/
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namespace DB
{
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namespace ErrorCodes
{
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extern const int SUPPORT_IS_DISABLED;
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}
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void FreezeMetaData::fill(const StorageReplicatedMergeTree & storage)
{
replica_name = storage.getReplicaName();
zookeeper_name = storage.getZooKeeperName();
table_shared_id = storage.getTableSharedID();
}
void FreezeMetaData::save(DiskPtr data_disk, const String & path) const
{
auto metadata_storage = data_disk->getMetadataStorage();
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auto file_path = getFileName(path);
auto tx = metadata_storage->createTransaction();
WriteBufferFromOwnString buffer;
writeIntText(version, buffer);
buffer.write("\n", 1);
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if (version == 1)
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{
/// is_replicated and is_remote are not used
bool is_replicated = true;
writeBoolText(is_replicated, buffer);
buffer.write("\n", 1);
bool is_remote = true;
writeBoolText(is_remote, buffer);
buffer.write("\n", 1);
}
writeString(escapeForFileName(replica_name), buffer);
buffer.write("\n", 1);
writeString(zookeeper_name, buffer);
buffer.write("\n", 1);
writeString(table_shared_id, buffer);
buffer.write("\n", 1);
tx->writeStringToFile(file_path, buffer.str());
tx->commit();
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}
bool FreezeMetaData::load(DiskPtr data_disk, const String & path)
{
auto metadata_storage = data_disk->getMetadataStorage();
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auto file_path = getFileName(path);
if (!metadata_storage->exists(file_path))
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return false;
auto metadata_str = metadata_storage->readFileToString(file_path);
ReadBufferFromString buffer(metadata_str);
readIntText(version, buffer);
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if (version < 1 || version > 2)
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{
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LOG_ERROR(getLogger("FreezeMetaData"), "Unknown frozen metadata version: {}", version);
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return false;
}
DB::assertChar('\n', buffer);
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if (version == 1)
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{
/// is_replicated and is_remote are not used
bool is_replicated;
readBoolText(is_replicated, buffer);
DB::assertChar('\n', buffer);
bool is_remote;
readBoolText(is_remote, buffer);
DB::assertChar('\n', buffer);
}
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std::string unescaped_replica_name;
readString(unescaped_replica_name, buffer);
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replica_name = unescapeForFileName(unescaped_replica_name);
DB::assertChar('\n', buffer);
readString(zookeeper_name, buffer);
DB::assertChar('\n', buffer);
readString(table_shared_id, buffer);
DB::assertChar('\n', buffer);
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return true;
}
void FreezeMetaData::clean(DiskPtr data_disk, const String & path)
{
auto metadata_storage = data_disk->getMetadataStorage();
auto fname = getFileName(path);
if (metadata_storage->exists(fname))
{
auto tx = metadata_storage->createTransaction();
tx->unlinkFile(fname);
tx->commit();
}
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}
String FreezeMetaData::getFileName(const String & path)
{
return fs::path(path) / "frozen_metadata.txt";
}
Unfreezer::Unfreezer(ContextPtr context) : local_context(context)
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{
if (local_context->hasZooKeeper())
zookeeper = local_context->getZooKeeper();
}
BlockIO Unfreezer::systemUnfreeze(const String & backup_name)
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{
LOG_DEBUG(log, "Unfreezing backup {}", escapeForFileName(backup_name));
const auto & config = local_context->getConfigRef();
static constexpr auto config_key = "enable_system_unfreeze";
if (!config.getBool(config_key, false))
{
throw Exception(ErrorCodes::SUPPORT_IS_DISABLED,
"Support for SYSTEM UNFREEZE query is disabled. You can enable it via '{}' server setting",
config_key);
}
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auto disks_map = local_context->getDisksMap();
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Disks disks;
for (auto & [name, disk]: disks_map)
{
disks.push_back(disk);
}
auto backup_path = fs::path(backup_directory_prefix) / escapeForFileName(backup_name);
auto store_paths = {backup_path / "store", backup_path / "data"};
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PartitionCommandsResultInfo result_info;
for (const auto & disk: disks)
{
for (const auto& store_path: store_paths)
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{
if (!disk->exists(store_path))
continue;
for (auto prefix_it = disk->iterateDirectory(store_path); prefix_it->isValid(); prefix_it->next())
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{
auto prefix_directory = store_path / prefix_it->name();
for (auto table_it = disk->iterateDirectory(prefix_directory); table_it->isValid(); table_it->next())
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{
auto table_directory = prefix_directory / table_it->name();
auto current_result_info = unfreezePartitionsFromTableDirectory(
[](const String &) { return true; }, backup_name, {disk}, table_directory);
for (auto & command_result : current_result_info)
{
command_result.command_type = "SYSTEM UNFREEZE";
}
result_info.insert(
result_info.end(),
std::make_move_iterator(current_result_info.begin()),
std::make_move_iterator(current_result_info.end()));
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}
}
}
if (disk->exists(backup_path))
{
/// After unfreezing we need to clear revision.txt file and empty directories
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disk->removeRecursive(backup_path);
}
}
BlockIO result;
if (!result_info.empty())
{
result.pipeline = QueryPipeline(convertCommandsResultToSource(result_info));
}
return result;
}
bool Unfreezer::removeFreezedPart(DiskPtr disk, const String & path, const String & part_name, ContextPtr local_context, zkutil::ZooKeeperPtr zookeeper)
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{
if (disk->supportZeroCopyReplication())
{
FreezeMetaData meta;
if (meta.load(disk, path))
{
FreezeMetaData::clean(disk, path);
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return StorageReplicatedMergeTree::removeSharedDetachedPart(disk, path, part_name, meta.table_shared_id, meta.replica_name, "", local_context, zookeeper);
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}
}
disk->removeRecursive(path);
return false;
}
PartitionCommandsResultInfo Unfreezer::unfreezePartitionsFromTableDirectory(MergeTreeData::MatcherFn matcher, const String & backup_name, const Disks & disks, const fs::path & table_directory)
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{
PartitionCommandsResultInfo result;
for (const auto & disk : disks)
{
if (!disk->exists(table_directory))
continue;
for (auto it = disk->iterateDirectory(table_directory); it->isValid(); it->next())
{
const auto & partition_directory = it->name();
/// Partition ID is prefix of part directory name: <partition id>_<rest of part directory name>
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auto found = partition_directory.find('_');
if (found == std::string::npos)
continue;
auto partition_id = partition_directory.substr(0, found);
if (!matcher(partition_id))
continue;
const auto & path = it->path();
bool keep_shared = removeFreezedPart(disk, path, partition_directory, local_context, zookeeper);
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result.push_back(PartitionCommandResultInfo{
.command_type = "UNFREEZE PART",
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.partition_id = partition_id,
.part_name = partition_directory,
.backup_path = disk->getPath() + table_directory.generic_string(),
.part_backup_path = disk->getPath() + path,
.backup_name = backup_name,
});
LOG_DEBUG(log, "Unfrozen part by path {}, keep shared data: {}", disk->getPath() + path, keep_shared);
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}
}
LOG_DEBUG(log, "Unfrozen {} parts", result.size());
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return result;
}
}