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From "Runping Qi (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-2180) Each task tracker should not execute more than one speculative task
Date Fri, 09 Nov 2007 17:39:50 GMT
Each task tracker should not execute more than one speculative task
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                 Key: HADOOP-2180
                 URL: https://issues.apache.org/jira/browse/HADOOP-2180
             Project: Hadoop
          Issue Type: Bug
          Components: mapred
            Reporter: Runping Qi



I noticed that sometimes, a tasktracker started 2 or three speculative mapper tasks.
That seems counter productive. You want to speculative execution complete as soon as possible.
Thus, it is better to spread speculative execution over multiple trackers. A simple way to

achieve that is to limit the number of speculative eecution concurrently.


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