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From "Sreekanth Ramakrishnan (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (MAPREDUCE-513) Prior code fix in Capacity Scheduler prevents speculative execution in jobs
Date Wed, 29 Jul 2009 08:56:14 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-513?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Sreekanth Ramakrishnan resolved MAPREDUCE-513.
----------------------------------------------

    Resolution: Fixed

The TestQueueCapacities have been fixed in HADOOP-5869


> Prior code fix in Capacity Scheduler prevents speculative execution in jobs
> ---------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-513
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-513
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>            Reporter: Vivek Ratan
>            Assignee: Sreekanth Ramakrishnan
>         Attachments: 4981.1.patch, 4981.2.patch, HADOOP-4981-1.patch, HADOOP-4981-2.patch,
HADOOP-4981-3.patch, HADOOP-4981-4.patch, HADOOP-4981-5-br20.patch, HADOOP-4981-5.patch
>
>
> As part of the code fix for HADOOP-4035, the Capacity Scheduler obtains a task from JobInProgress
(calling obtainNewMapTask() or obtainNewReduceTask()) only if the number of pending tasks
for a job is greater than zero (see the if-block in TaskSchedulingMgr.getTaskFromJob()). So,
if a job has no pending tasks and only has running tasks, it will never be given a slot, and
will never have a chance to run a speculative task. 

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