Till Rohrmann created FLINK-5073:
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Summary: ZooKeeperCompleteCheckpointStore executes blocking delete
operation in ZooKeeper client thread
Key: FLINK-5073
URL: https://issues.apache.org/jira/browse/FLINK-5073
Project: Flink
Issue Type: Bug
Components: Distributed Coordination
Affects Versions: 1.1.3, 1.2.0
Reporter: Till Rohrmann
Assignee: Till Rohrmann
Fix For: 1.2.0, 1.1.4
When deleting completed checkpoints from the
{{ZooKeeperCompletedCheckpointStore}}, one first tries to delete the meta state
handle from ZooKeeper and then deletes the actual checkpoint in a callback from
the delete operation. This callback is executed by the ZooKeeper client's main
thread which is problematic, because it blocks the ZooKeeper client. If a
delete operation takes longer than it takes to complete a checkpoint, then it
might even happen that delete operations of outdated checkpoints are piling up
because they are effectively executed sequentially.
I propose to execute the delete operations by a dedicated {{Executor}} so that
we keep the client's main thread free to do ZooKeeper related work.
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