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From "Runping Qi (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-2119) JobTracker becomes non-responsive if the task trackers finish task too fast
Date Mon, 29 Oct 2007 20:44:50 GMT
JobTracker becomes non-responsive if the task trackers finish task too fast
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                 Key: HADOOP-2119
                 URL: https://issues.apache.org/jira/browse/HADOOP-2119
             Project: Hadoop
          Issue Type: Bug
          Components: mapred
            Reporter: Runping Qi
             Fix For: 0.15.0



I ran a job with 0 reducer on a cluster with 390 nodes.
The mappers ran very fast.
The jobtracker lacks behind on committing completed mapper tasks.
The number of running mappers displayed on web UI getting bigger and bigger.
The jos tracker eventually stopped responding to web UI.

No progress is reported afterwards.

Job tracker is running on a separate node.
The job tracker process consumed 100% cpu, with vm size 1.01g (reach the heap space limit).



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