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From "Dick King (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-2214) TaskTracker should release slot if task is not launched
Date Wed, 08 Dec 2010 20:55:05 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-2214?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12969485#action_12969485
] 

Dick King commented on MAPREDUCE-2214:
--------------------------------------

Speculative execution is a legitimate way a task can become {{SUCCEEDED}} while an attempt
on that task is waiting to get launched.

> TaskTracker should release slot if task is not launched
> -------------------------------------------------------
>
>                 Key: MAPREDUCE-2214
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2214
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>    Affects Versions: 0.20.1
>            Reporter: Ramkumar Vadali
>            Assignee: Ramkumar Vadali
>
> TaskTracker.TaskInProgress.launchTask() does not launch a task if it is not in an expected
state. However, in the case where the task is not launched, the slot is not released. We have
observed this in production - the task was in SUCCEEDED state by the time launchTask() got
to it and then the slot was never released. It is not clear how the task got into that state,
but it is better to handle the case.

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