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https://issues.apache.org/jira/browse/MAPREDUCE-5956?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14106414#comment-14106414
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Ashwin Shankar commented on MAPREDUCE-5956:
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[~zjshen], could you please elaborate when and why this fix will lead to
undeleted staging dirs ?
In such cases, would the job go missing on the history server ? Any other
impact ?
I'm asking this, because we are backporting this patch into our release.
> MapReduce AM should not use maxAttempts to determine if this is the last retry
> ------------------------------------------------------------------------------
>
> Key: MAPREDUCE-5956
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-5956
> Project: Hadoop Map/Reduce
> Issue Type: Sub-task
> Components: applicationmaster, mrv2
> Affects Versions: 2.4.0
> Reporter: Vinod Kumar Vavilapalli
> Assignee: Wangda Tan
> Priority: Blocker
> Fix For: 2.6.0
>
> Attachments: MR-5956.patch, MR-5956.patch
>
>
> Found this while reviewing YARN-2074. The problem is that after YARN-2074, we
> don't count AM preemption towards AM failures on RM side, but MapReduce AM
> itself checks the attempt id against the max-attempt count to determine if
> this is the last attempt.
> {code}
> public void computeIsLastAMRetry() {
> isLastAMRetry = appAttemptID.getAttemptId() >= maxAppAttempts;
> }
> {code}
> This causes issues w.r.t deletion of staging directory etc..
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