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Added comment for selecting disk for mutation.

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Vladimir Chebotarev 2019-10-31 16:19:38 +03:00 committed by GitHub
parent f44cee623a
commit 0dea6f5458
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dbms/src/Storages/StorageReplicatedMergeTree.cpp
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@ -1139,6 +1139,7 @@ bool StorageReplicatedMergeTree::tryExecutePartMutation(const StorageReplicatedM
MutationCommands commands = queue.getMutationCommands(source_part, new_part_info.mutation);
/// Can throw an exception.
/// Once we mutate part, we must reserve space on the same disk, because mutations can possibly create hardlinks.
DiskSpace::ReservationPtr reserved_space = source_part->disk->reserveSpace(estimated_space_for_result);
auto table_lock = lockStructureForShare(false, RWLockImpl::NO_QUERY);