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https://issues.apache.org/jira/browse/MAPREDUCE-7278?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17096650#comment-17096650
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Tarun Parimi commented on MAPREDUCE-7278:
-----------------------------------------
Mutiple task attempts are tried simultaneously for a single attempt failure.
This is because {{TaskAttemptImpl#notifyTaskAttemptFailed()}} is called twice,
when TaskAttempt transitions from,
1. RUNNING -> FAIL_FINISHING_CONTAINER
2. FAIL_CONTAINER_CLEANUP -> FAIL_TASK_CLEANUP -> FAILED
But this issue is seen only after the MAPREDUCE-6485 code change, since it
allows multiple new taskattempts to launch even if there are existing
taskattempts for that task. It checks whether a container is assigned, but in a
fully utilized cluster container assignment can take a few minutes and so we
can have two taskattempts launched when the above transitions occur.
> Speculative execution behavior is observed even when
> mapreduce.map.speculative and mapreduce.reduce.speculative are false
> -------------------------------------------------------------------------------------------------------------------------
>
> Key: MAPREDUCE-7278
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-7278
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: task
> Affects Versions: 2.8.0
> Reporter: Tarun Parimi
> Priority: Major
> Attachments: Screen Shot 2020-04-30 at 8.04.27 PM.png
>
>
> When a failed task attempt container is stuck in FAIL_FINISHING_CONTAINER
> state for some time, we observe two task attempts are launched simultaneously
> even when speculative execution is disabled.
> This results in the below message shown in the killed attempts, indicating
> speculation has occurred. This is an issue for jobs which require speculative
> execution to be strictly disabled.
> !Screen Shot 2020-04-30 at 8.04.27 PM.png!
>
>
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