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https://issues.apache.org/jira/browse/YARN-1849?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13941275#comment-13941275
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Jian He commented on YARN-1849:
-------------------------------
Those NULL checks should be valid only for UMA. Normal AM should not happen, if
it happens, it’s a bug. suggest instead of those NULL checks which may hide
bug, check if it is UMA, if it is , do not send the container finished events.
> NPE in ResourceTrackerService#registerNodeManager for UAM on secure clusters
> ----------------------------------------------------------------------------
>
> Key: YARN-1849
> URL: https://issues.apache.org/jira/browse/YARN-1849
> Project: Hadoop YARN
> Issue Type: Bug
> Components: resourcemanager
> Affects Versions: 2.4.0
> Reporter: Karthik Kambatla
> Assignee: Karthik Kambatla
> Priority: Blocker
> Attachments: yarn-1849-1.patch, yarn-1849-2.patch, yarn-1849-2.patch,
> yarn-1849-3.patch
>
>
> While running an UnmanagedAM on secure cluster, ran into an NPE on
> failover/restart. This is similar to YARN-1821.
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