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From "Steve Loughran (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-3431) NPE in Resource Manager shutdown
Date Sun, 20 Nov 2011 17:55:51 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-3431?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13153835#comment-13153835
] 

Steve Loughran commented on MAPREDUCE-3431:
-------------------------------------------

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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