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Merge pull request #24499 from ClickHouse/fix_fake_race

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Fix benign race (detected by clang-12) in Keeper snapshots
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alesapin 2021-05-26 11:43:22 +03:00 committed by GitHub
commit b63dfeef88
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1 changed files with 8 additions and 1 deletions
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9
src/Coordination/KeeperSnapshotManager.cpp
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@ -139,7 +139,7 @@ void KeeperStorageSnapshot::serialize(const KeeperStorageSnapshot & snapshot, Wr
writeBinary(snapshot.session_id, out);
writeBinary(snapshot.snapshot_container_size, out);
size_t counter = 0;
for (auto it = snapshot.begin; counter < snapshot.snapshot_container_size; ++it, ++counter)
for (auto it = snapshot.begin; counter < snapshot.snapshot_container_size; ++counter)
{
const auto & path = it->key;
const auto & node = it->value;
@ -148,6 +148,13 @@ void KeeperStorageSnapshot::serialize(const KeeperStorageSnapshot & snapshot, Wr
writeBinary(path, out);
writeNode(node, out);
/// Last iteration: check and exit here without iterator increment. Otherwise
/// false positive race condition on list end is possible.
if (counter == snapshot.snapshot_container_size - 1)
break;
++it;
}
size_t size = snapshot.session_and_timeout.size();