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https://issues.apache.org/jira/browse/FLINK-10185?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16586610#comment-16586610
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ASF GitHub Bot commented on FLINK-10185:
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tillrohrmann opened a new pull request #6586: [FLINK-10185] Make
ZooKeeperStateHandleStore#releaseAndTryRemove synchronous
URL: https://github.com/apache/flink/pull/6586
## What is the purpose of the change
Remove the asynchronous callback from
ZooKeeperStateHandleStore#releaseAndTryRemove.
Instead we can execute the callback after having executed the
releaseAndTryRemove
method successfully. This separates concerns better because we don't mix
storage
with business logic. Furthermore, we can still avoid blocking operations if
we use a
separate thread to call into ZooKeeperStateHandleStore#releaseAndTryRemove.
## Brief change log
- Make `ZooKeeperStateHandleStore#releaseAndTryRemove` synchronous
- Introduce `ZooKeeperResource` which starts a `ZooKeeper` server
## Verifying this change
- Changes is covered by `ZooKeeperStateHandleStoreTest#testRemove` and
`ZooKeeperCompletedCheckpointStoreTest#testDiscardingSubsumedCheckpoints` and
`ZooKeeperCompletedCheckpointStoreTest#testDiscardingCheckpointsAtShutDown`
## Does this pull request potentially affect one of the following parts:
- Dependencies (does it add or upgrade a dependency): (no)
- The public API, i.e., is any changed class annotated with
`@Public(Evolving)`: (no)
- The serializers: (no)
- The runtime per-record code paths (performance sensitive): (no)
- Anything that affects deployment or recovery: JobManager (and its
components), Checkpointing, Yarn/Mesos, ZooKeeper: (yes)
- The S3 file system connector: (no)
## Documentation
- Does this pull request introduce a new feature? (no)
- If yes, how is the feature documented? (not applicable)
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> Make ZooKeeperStateHandleStore#releaseAndTryRemove synchronous
> --------------------------------------------------------------
>
> Key: FLINK-10185
> URL: https://issues.apache.org/jira/browse/FLINK-10185
> Project: Flink
> Issue Type: Improvement
> Components: Distributed Coordination
> Affects Versions: 1.4.2, 1.5.2, 1.6.0, 1.7.0
> Reporter: Till Rohrmann
> Assignee: Till Rohrmann
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.4.3, 1.6.1, 1.7.0, 1.5.4
>
>
> The {{ZooKeeperStateHandleStore#releaseAndTryRemove}} method executes parts
> of its logic synchronously (retrieving the state handle and unlocking the
> ZNode) and others asynchronously (removing the ZNode). Moreover, the method
> takes a parameter which is used to execute some logic in case of a successful
> removal. This was done in order to execute a potentially blocking state
> discard operation in a different thread.
> I think this can be simplified by executing all logic in the same thread and
> running the callback after having called
> {{ZooKeeperStateHandleStore#releaseAndTryRemove}}. Moreover, if this
> operation needs to be not blocking one could use a different thread to call
> into this method.
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