[jira] [Updated] (SAMZA-1584) Improve logging in StreamProcessor.

["Shanthoosh Venkataraman (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SAMZA-1584?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Shanthoosh Venkataraman updated SAMZA-1584:
-------------------------------------------
    Summary: Improve logging in StreamProcessor.  (was: Improve SamzaContainer shutdown sequence in StreamProcessor.)

> Improve logging in StreamProcessor.
> -----------------------------------
>
>                 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 message to route to tasks. 
> 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 the SamzaContainer shutdown sequence blocks indefinitely.



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