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https://issues.apache.org/jira/browse/MAPREDUCE-2043?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12904296#action_12904296
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Chris Douglas commented on MAPREDUCE-2043:
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Most of the listeners it defines are called during heartbeats... allowing
administrators to put arbitrary code in that inner loop was not in its design.
Have you looked at HADOOP-6728? If I understand the design doc, it allows a
{{MetricsSink}} to be defined and notified outside of that cycle.
> 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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