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Posted to commits@samza.apache.org by "Shanthoosh Venkataraman (JIRA)" <ji...@apache.org> on 2018/02/13 00:33:00 UTC
[jira] [Commented] (SAMZA-1584)
LocalApplicationRunner.waitForFinish blocks indefinitely.
[ https://issues.apache.org/jira/browse/SAMZA-1584?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16361646#comment-16361646 ]
Shanthoosh Venkataraman commented on SAMZA-1584:
------------------------------------------------
[~boryas]
One possible solution is to wait for TASK_SHUTDOWN_MS after invoking SamzaContainer.shutdown() and trigger the shutdown sequence of StreamProcessor and ZkJobCoordinator even if the shutdown is not completed.
> LocalApplicationRunner.waitForFinish blocks indefinitely.
> ---------------------------------------------------------
>
> Key: SAMZA-1584
> URL: https://issues.apache.org/jira/browse/SAMZA-1584
> Project: Samza
> Issue Type: Bug
> Reporter: Shanthoosh Venkataraman
> Assignee: Shanthoosh Venkataraman
> Priority: Major
>
> Recommended solution to kill streamApplication in standalone is the following:
> {code:java}
> LocalApplicationRunner.kill(streamApp);
> LocalApplicationRunner.waitForFinish();{code}
> `LocalApplicationRunner.kill(streamApplication)` invokes `StreamProcessor.stop()` and `StreamProcessor.stop()` invokes `SamzaContainer.shutdown()` to kill the samza-container.
> `SamzaContainer.shutdown()` marks the shutdown flag of `AsyncRunLoop` and shutdown flag will be taken into account by `AsyncRunLoop` when it chooses the next operation to execute.
> Actual shutdown sequence of StreamProcessor and ZkJobCoordinator is triggered on SamzaContainerListener.onContainerStop() callback which is fired when the SamzaContainer is completely shutdown. LocalApplication.awaitForFinish() will block forever in following two scenarios:
> - If any of the AsyncRunLoop operation(commit, window, process) is going on indefinitely, then the marked shutdown flag will not be seen by the AsyncRunLoop.
> - If any step in SamzaContainer shutdown sequence blocks indefinitely.
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