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https://issues.apache.org/jira/browse/MAPREDUCE-3431?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13153835#comment-13153835
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Steve Loughran commented on MAPREDUCE-3431:
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the root cause of this is the service {{stop()}} method assumes the service
started up correctly, and hence that all member fields are non-null. Each field
should be assessed for null-ness before use, and set to null afterwards, to
stop re-entrant calls. All yarn services will need reviewing. Testing is hard
as it's tricky to generate all code-paths needed to stress every action in the
{{stop()}} method
> NPE in Resource Manager shutdown
> --------------------------------
>
> Key: MAPREDUCE-3431
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-3431
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: resourcemanager
> Affects Versions: 0.23.0
> Environment: OS/X w/ java6
> Reporter: Steve Loughran
> Priority: Minor
>
> bringing up a resource manager failed; shutdown triggered an NPE
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