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From "Philip Zeyliger (JIRA)" <j...@apache.org>
Subject [jira] Created: (MAPREDUCE-2043) TaskTrackerInstrumentation and JobTrackerInstrumentation should be public
Date Mon, 30 Aug 2010 18:09:53 GMT
TaskTrackerInstrumentation and JobTrackerInstrumentation should be public

                 Key: MAPREDUCE-2043
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2043
             Project: Hadoop Map/Reduce
          Issue Type: Improvement
          Components: tasktracker
    Affects Versions: 0.22.0
            Reporter: Philip Zeyliger
            Assignee: Philip Zeyliger
         Attachments: MAPREDUCE-2043.patch.txt

Hadoop administrators can specify classes to be loaded as "TaskTrackerInstrumentation" and
"JobTrackerInstrumentation" implementations, which, roughly, define listeners on TT and JT
events.  Unfortunately, since the class has default access, extending it requires setting
the extension's package to org.apache.hadoop.mapred, which seems like poor form.

I propose we make the two instrumentation classes public, so they can be extended wherever.

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