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https://issues.apache.org/jira/browse/MAPREDUCE-4425?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13495433#comment-13495433
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Robert Joseph Evans commented on MAPREDUCE-4425:
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I put this into trunk, and branch-2, but it does not appear to be a clean merge
to 0.23. Could you provide another patch for that?
> Speculation + Fetch failures can lead to a hung job
> ---------------------------------------------------
>
> Key: MAPREDUCE-4425
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-4425
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: mrv2
> Affects Versions: 0.23.1
> Reporter: Siddharth Seth
> Assignee: Jason Lowe
> Priority: Critical
> Attachments: MAPREDUCE-4425.patch, MAPREDUCE-4425.patch
>
>
> After a task goes to SUCCEEDED, FAILED/KILLED attempts are ignored.
> 1. attemp1 starts
> 2. speculative attempt starts
> 3. attempt 1 completes - Task moves to SUCCEEDED state
> 4. speculative attempt is KILLED
> 5. T_ATTEMPT_KILLED is ignored.
> 6. attemp1 1 fails with TOO_MANY_FETCH_FAILURES
> The job will effectively hang, since a new task attempt isn't started.
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