[jira] [Created] (YARN-10184) NPE happens in NMClient when reinitializeContainer

["kyungwan nam (Jira)" <ji...@apache.org>]

kyungwan nam created YARN-10184:
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             Summary: 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


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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