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From "Hemanth Yamijala (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-6033) Set mapred.child.ulimit automatically to the value of the RAM limits for a job, if they are set
Date Sat, 13 Jun 2009 05:15:07 GMT
Set mapred.child.ulimit automatically to the value of the RAM limits for a job, if they are
set
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                 Key: HADOOP-6033
                 URL: https://issues.apache.org/jira/browse/HADOOP-6033
             Project: Hadoop Core
          Issue Type: Bug
          Components: mapred
    Affects Versions: 0.20.1
            Reporter: Hemanth Yamijala


Memory based monitoring and scheduling allow users to set memory limits for the tasks of their
jobs. This parameter is the total memory taken by the task, and any children it may launch
(for e.g. in the case of streaming). A related parameter is mapred.child.ulimit which is a
hard limit on the memory used by a single process of the entire task tree. For user convenience,
it would be sensible for the system to set the ulimit to atleast the memory required by the
task, if the user has specified the latter.

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