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https://issues.apache.org/jira/browse/MAPREDUCE-4927?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ashwin Shankar updated MAPREDUCE-4927:
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Attachment: MAPREDUCE-4927.txt
The problem is that a failed task doesn't have counters and we assume that we
always get counters which causes an NPE. I've added a null check for counters
to fix this. Also I've changed a unit test to incorporate this case.
> Historyserver 500 error due to NPE when accessing specific counters page for
> failed job
> ---------------------------------------------------------------------------------------
>
> Key: MAPREDUCE-4927
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-4927
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: jobhistoryserver
> Affects Versions: 2.0.3-alpha, 0.23.6
> Reporter: Jason Lowe
> Attachments: MAPREDUCE-4927.txt
>
>
> Went to the historyserver page for a job that failed and examined the
> counters page. When I clicked on a specific counter, the historyserver
> returned a 500 error. The historyserver logs showed it encountered an NPE
> error, full traceback to follow.
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