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https://issues.apache.org/jira/browse/YARN-7565?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16298837#comment-16298837
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Eric Yang commented on YARN-7565:
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More information revealed that, there was a problem with znode on my cluster.
I am not sure how it reached that state. By removing the faulty znode for DNS
registry, the null pointer exception problem doesn't happen any more.
> Yarn service pre-maturely releases the container after AM restart
> ------------------------------------------------------------------
>
> Key: YARN-7565
> URL: https://issues.apache.org/jira/browse/YARN-7565
> Project: Hadoop YARN
> Issue Type: Sub-task
> Reporter: Chandni Singh
> Assignee: Chandni Singh
> Fix For: 3.1.0
>
> Attachments: YARN-7565.001.patch, YARN-7565.002.patch,
> YARN-7565.003.patch, YARN-7565.004.patch, YARN-7565.005.patch,
> YARN-7565.addendum.001.patch
>
>
> With YARN-6168, recovered containers can be reported to AM in response to the
> AM heartbeat.
> Currently, the Service Master will release the containers, that are not
> reported in the AM registration response, immediately.
> Instead, the master can wait for a configured amount of time for the
> containers to be recovered by RM. These containers are sent to AM in the
> heartbeat response. Once a container is not reported in the configured
> interval, it can be released by the master.
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