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Posted to common-dev@hadoop.apache.org by "Amar Kamat (JIRA)" <ji...@apache.org> on 2009/01/12 08:56:59 UTC

[jira] Created: (HADOOP-5013) JobTracker should not expand jobs if its running low on memory

JobTracker should not expand jobs if its running low on memory
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                 Key: HADOOP-5013
                 URL: https://issues.apache.org/jira/browse/HADOOP-5013
             Project: Hadoop Core
          Issue Type: Improvement
          Components: mapred
    Affects Versions: 0.21.0
            Reporter: Amar Kamat
             Fix For: 0.21.0


When the JobTracker detects that its running low on memory it should not expand new jobs if the job has the potential to bring it down. Consider and example where the JobTracker runs on 60% of the max memory and a new job is submitted which can take upto 40% of the max memory.  Ideally the JobTracker should _queue_ the job for expansion and expand when sufficient memory is available.

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