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Posted to common-dev@hadoop.apache.org by "Chris Douglas (JIRA)" <ji...@apache.org> on 2009/05/28 02:25:45 UTC
[jira] Reopened: (HADOOP-4981) Prior code fix in Capacity Scheduler
prevents speculative execution in jobs
[ https://issues.apache.org/jira/browse/HADOOP-4981?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Chris Douglas reopened HADOOP-4981:
-----------------------------------
TestQueueCapacities is failing in 0.20. When HADOOP-4792 is reverted, this causes TestQueueCapacities to fail in trunk.
> Prior code fix in Capacity Scheduler prevents speculative execution in jobs
> ---------------------------------------------------------------------------
>
> Key: HADOOP-4981
> URL: https://issues.apache.org/jira/browse/HADOOP-4981
> Project: Hadoop Core
> Issue Type: Bug
> Components: contrib/capacity-sched
> Reporter: Vivek Ratan
> Assignee: Sreekanth Ramakrishnan
> Fix For: 0.20.1
>
> 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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