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https://issues.apache.org/jira/browse/MAPREDUCE-4880?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sandy Ryza resolved MAPREDUCE-4880.
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Resolution: Not A Problem
It looks like this was already fixed in MAPREDUCE-4607
> TaskImpl interprets death of second attempt as RetroactiveKilledTransition
> even when first attempt succeeds
> -----------------------------------------------------------------------------------------------------------
>
> Key: MAPREDUCE-4880
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-4880
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: mr-am
> Affects Versions: 2.0.2-alpha
> Reporter: Sandy Ryza
>
> Consider a reduce task with 2 attempts, one running and one unassigned.
> Reduce task attempt 1 succeeds. This causes reduce task attempt 2 to be
> killed. This causes reduce task attempt 2 to issue a T_ATTEMPT_KILLED, which
> the TaskImpl interprets as a RetroactiveKilledTransition. As
> RetroactiveKilledTransitions are supposed to only apply to map events, the
> TaskImpl errors with "Unexpected event for REDUCE task T_ATTEMPT_KILLED".
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