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Backport #28446 to 21.9: Fix watch leak in DDLWorker
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Backport #28446 to 21.8: Fix watch leak in DDLWorker
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Backport #28446 to 21.7: Fix watch leak in DDLWorker
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Changelog entry (a user-readable short description of the changes that goes to CHANGELOG.md):
Fixed possible ZooKeeper watches leak on background processing of distributed DDL queue. Closes #26036
Detailed description / Documentation draft:
NOTE: Watches leak is still possible in
StorageReplicatedMergeTree::tryWaitForReplicaToProcessLogEntryand probably in some other places