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speedup merge selection: async exists check for selected parts [#CLICKHOUSE-3802]

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Alexey Zatelepin 2018-07-04 18:44:12 +03:00 committed by alexey-milovidov
parent 116ed0a59e
commit 0a46d231ed
1 changed files with 9 additions and 2 deletions
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11
dbms/src/Storages/StorageReplicatedMergeTree.cpp
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@ -2282,14 +2282,20 @@ bool StorageReplicatedMergeTree::createLogEntryToMergeParts(
bool deduplicate,
ReplicatedMergeTreeLogEntryData * out_log_entry)
{
bool all_in_zk = true;
std::vector<std::future<zkutil::ExistsResponse>> exists_futures;
exists_futures.reserve(parts.size());
for (const auto & part : parts)
exists_futures.emplace_back(zookeeper->asyncExists(replica_path + "/parts/" + part->name));
bool all_in_zk = true;
for (size_t i = 0; i < parts.size(); ++i)
{
/// If there is no information about part in ZK, we will not merge it.
if (!zookeeper->exists(replica_path + "/parts/" + part->name))
if (exists_futures[i].get().error == ZooKeeperImpl::ZooKeeper::ZNONODE)
{
all_in_zk = false;
const auto & part = parts[i];
if (part->modification_time + MAX_AGE_OF_LOCAL_PART_THAT_WASNT_ADDED_TO_ZOOKEEPER < time(nullptr))
{
LOG_WARNING(log, "Part " << part->name << " (that was selected for merge)"
@ -2300,6 +2306,7 @@ bool StorageReplicatedMergeTree::createLogEntryToMergeParts(
}
}
}
if (!all_in_zk)
return false;