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Merge pull request #42317 from ClickHouse/fix_another_trash_with_zero_cop

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Fix another trash in zero-copy replication
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alesapin 2022-10-18 12:51:16 +02:00 committed by GitHub
commit 673adfbd5c
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1 changed files with 21 additions and 7 deletions
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26
src/Storages/StorageReplicatedMergeTree.cpp
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@ -7673,14 +7673,14 @@ namespace
/// But sometimes we need an opposite. When we deleting all_0_0_0_1 it can be non replicated to other replicas, so we are the only owner of this part.
/// In this case when we will drop all_0_0_0_1 we will drop blobs for all_0_0_0. But it will lead to dataloss. For such case we need to check that other replicas
/// still need parent part.
NameSet getParentLockedBlobs(zkutil::ZooKeeperPtr zookeeper_ptr, const std::string & zero_copy_part_path_prefix, const std::string & part_info_str, MergeTreeDataFormatVersion format_version, Poco::Logger * log)
std::pair<bool, NameSet> getParentLockedBlobs(zkutil::ZooKeeperPtr zookeeper_ptr, const std::string & zero_copy_part_path_prefix, const std::string & part_info_str, MergeTreeDataFormatVersion format_version, Poco::Logger * log)
{
NameSet files_not_to_remove;
MergeTreePartInfo part_info = MergeTreePartInfo::fromPartName(part_info_str, format_version);
/// No mutations -- no hardlinks -- no issues
if (part_info.mutation == 0)
return files_not_to_remove;
return {false, files_not_to_remove};
/// Getting all zero copy parts
Strings parts_str;
@ -7725,10 +7725,10 @@ NameSet getParentLockedBlobs(zkutil::ZooKeeperPtr zookeeper_ptr, const std::stri
LOG_TRACE(log, "Found files not to remove from parent part {}: [{}]", part_candidate_info_str, fmt::join(files_not_to_remove, ", "));
}
break;
return {true, files_not_to_remove};
}
}
return files_not_to_remove;
return {false, files_not_to_remove};
}
}
@ -7754,7 +7754,7 @@ std::pair<bool, NameSet> StorageReplicatedMergeTree::unlockSharedDataByID(
if (!files_not_to_remove_str.empty())
boost::split(files_not_to_remove, files_not_to_remove_str, boost::is_any_of("\n "));
auto parent_not_to_remove = getParentLockedBlobs(zookeeper_ptr, fs::path(zc_zookeeper_path).parent_path(), part_name, data_format_version, logger);
auto [has_parent, parent_not_to_remove] = getParentLockedBlobs(zookeeper_ptr, fs::path(zc_zookeeper_path).parent_path(), part_name, data_format_version, logger);
files_not_to_remove.insert(parent_not_to_remove.begin(), parent_not_to_remove.end());
String zookeeper_part_uniq_node = fs::path(zc_zookeeper_path) / part_id;
@ -7764,10 +7764,24 @@ std::pair<bool, NameSet> StorageReplicatedMergeTree::unlockSharedDataByID(
LOG_TRACE(logger, "Remove zookeeper lock {} for part {}", zookeeper_part_replica_node, part_name);
if (auto ec = zookeeper_ptr->tryRemove(zookeeper_part_replica_node); ec != Coordination::Error::ZOK && ec != Coordination::Error::ZNONODE)
if (auto ec = zookeeper_ptr->tryRemove(zookeeper_part_replica_node); ec != Coordination::Error::ZOK)
{
/// Very complex case. It means that lock already doesn't exist when we tried to remove it.
/// So we don't know are we owner of this part or not. Maybe we just mutated it, renamed on disk and failed to lock in ZK.
/// But during mutation we can have hardlinks to another part. So it's not Ok to remove blobs of this part if it was mutated.
if (ec == Coordination::Error::ZNONODE)
{
if (has_parent)
{
LOG_INFO(logger, "Lock on path {} for part {} doesn't exist, refuse to remove blobs", zookeeper_part_replica_node, part_name);
return {false, {}};
}
}
else
{
throw zkutil::KeeperException(ec, zookeeper_part_replica_node);
}
}
/// Check, maybe we were the last replica and can remove part forever
Strings children;