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https://issues.apache.org/jira/browse/YARN-10184?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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kyungwan nam updated YARN-10184:
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Attachment: YARN-10184.002.patch
> NPE happens in NMClient when reinitializeContainer
> --------------------------------------------------
>
> Key: YARN-10184
> URL: https://issues.apache.org/jira/browse/YARN-10184
> Project: Hadoop YARN
> Issue Type: Bug
> Reporter: kyungwan nam
> Assignee: kyungwan nam
> Priority: Major
> Attachments: YARN-10184.001.patch, YARN-10184.002.patch
>
>
> NPE happens in NMClient when upgrading a yarn-service app which AM has been
> restarted.
> Here is AM’s log at the time of the NPE.
> {code}
> 2020-02-20 16:43:35,962 [Container Event Dispatcher] ERROR
> yarn.YarnUncaughtExceptionHandler - Thread Thread[Container Event
> Dispatcher,5,main] threw an Exception.
> java.lang.NullPointerException
> at
> org.apache.hadoop.yarn.client.api.async.impl.NMClientAsyncImpl$1.run(NMClientAsyncImpl.java:172)
> 2020-02-20 16:43:36,398 [AMRM Callback Handler Thread] WARN
> service.ServiceScheduler - Container
> container_e58_1581930783345_1954_01_000006 Completed. No component instance
> exists. exitStatus=-100. diagnostics=Container released by application
> {code}
> NMClient keeps containers since the container has been started.
> But, when restarting AM, NMClient is initialized and previous containers are
> lost.
> Since then, NPE will happen when reinitializeContainer is requested.
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