[
https://issues.apache.org/jira/browse/MAPREDUCE-5000?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13577184#comment-13577184
]
Siddharth Seth commented on MAPREDUCE-5000:
-------------------------------------------
+1. Looks good. Jason, could you please provide a branch-23 patch as well.
Thanks
> TaskImpl.getCounters() can return the counters for the wrong task attempt
> when task is speculating
> --------------------------------------------------------------------------------------------------
>
> Key: MAPREDUCE-5000
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-5000
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: mr-am
> Affects Versions: 0.23.6
> Reporter: Jason Lowe
> Assignee: Jason Lowe
> Priority: Critical
> Attachments: MAPREDUCE-5000.patch
>
>
> When a task is speculating and one attempt completes then sometimes the
> counters for the wrong attempt are aggregated into the total counters for the
> job. The scenario looks like this:
> # Two task attempts are racing, _0 and _1
> # _1 finishes first, causing the task to issue a TA_KILL to attempt _0
> # _0 receives TA_KILL, sets progress to 1.0f and waits for container cleanup
> # if TaskImpl.getCounters() is called now, TaskImpl.selectBestAttempt() can
> return _0 since it is not quite yet in the KILLED state yet progress is maxed
> out and no other attempt has more progress.
--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators
For more information on JIRA, see: http://www.atlassian.com/software/jira
