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https://issues.apache.org/jira/browse/MAPREDUCE-5110?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13632626#comment-13632626
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Karthik Kambatla commented on MAPREDUCE-5110:
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Thanks for chiming in, Vinod.
My intention was precisely to add an aggressive timeout for task attempt
launches and keeping it job-configurable should be good. We can implement it
either on JT or TT. Do you think it is okay to implement in on TT? Please
suggest - I ll upload a patch accordingly.
If interested, the user should be able to configure this timeout to be shorter
than the tracker-expiry-interval to ensure a single attempt.
> Long task launch delays can lead to multiple parallel attempts of the task
> --------------------------------------------------------------------------
>
> Key: MAPREDUCE-5110
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-5110
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: tasktracker
> Affects Versions: 1.1.2
> Reporter: Karthik Kambatla
> Assignee: Karthik Kambatla
> Attachments: expose-mr-5110.patch, mr-5110.patch, mr-5110.patch,
> mr-5110-tt-only.patch
>
>
> If a task takes too long to launch, the JT expires the task and schedules
> another attempt. The earlier attempt can start after the later attempt
> leading to two parallel attempts running at the same time. This is
> particularly an issue if the user turns off speculation and expects a single
> attempt of a task to run at any point in time.
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