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From "Hemanth Yamijala (JIRA)" <j...@apache.org>
Subject [jira] Created: (MAPREDUCE-828) Provide a mechanism to pause the jobtracker
Date Thu, 06 Aug 2009 06:17:14 GMT
Provide a mechanism to pause the jobtracker
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                 Key: MAPREDUCE-828
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-828
             Project: Hadoop Map/Reduce
          Issue Type: New Feature
          Components: jobtracker
            Reporter: Hemanth Yamijala


We've seen scenarios when we have needed to stop the namenode for a maintenance activity.
In such scenarios, if the jobtracker (JT) continues to run, jobs would fail due to initialization
or task failures (due to DFS). We could restart the JT enabling job recovery, during such
scenarios. But restart has proved to be a very intrusive activity, particularly if the JT
is not at fault itself and does not require a restart. The ask is for a admin-controlled feature
to pause the JT which would take it to a state somewhat analogous to the safe mode of DFS.

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