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From "Benjamin Reed (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-580) Job setup and take down on Nodes
Date Thu, 05 Oct 2006 22:41:19 GMT
Job setup and take down on Nodes
--------------------------------

                 Key: HADOOP-580
                 URL: http://issues.apache.org/jira/browse/HADOOP-580
             Project: Hadoop
          Issue Type: New Feature
          Components: mapred
            Reporter: Benjamin Reed


It would be nice if there was a hook for doing job provisioning and cleanup on compute nodes.
The TaskTracker implicitly knows when a job starts (a task for the job is received) and pollForTaskWithClosedJob()
will explicitly say that a job is finished if a Map task has been run (If only Reduce tasks
have run and are finished I don't think pollForTaskWithClosedJob() will return anything will
it?), but child Tasks do not get this information.

It would be nice if there was a hook so that programmers could do some provisioning when a
job starts and cleanup when a job ends. Caching addresses some of the provisioning, but in
some cases a helper daemon may need to be started or the results of queries need to be retrieved
and having startJob(), finishJob() callbacks that happen exactly once for each node that runs
part of the job would be wonderful.

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