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From "Vivek Ratan (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-4981) Prior code fix in Capacity Scheduler prevents speculative execution in jobs
Date Mon, 05 Jan 2009 08:39:44 GMT
Prior code fix in Capacity Scheduler prevents speculative execution in jobs
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                 Key: HADOOP-4981
                 URL: https://issues.apache.org/jira/browse/HADOOP-4981
             Project: Hadoop Core
          Issue Type: Bug
            Reporter: Vivek Ratan
            Priority: Critical


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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