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https://issues.apache.org/jira/browse/MAPREDUCE-2043?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12904476#action_12904476
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Luke Lu commented on MAPREDUCE-2043:
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@Chris, see MAPREDUCE-1881 for a summary comparison between the instrumentation
interface and the metrics framework.
The intended audience for the instrumentation classes is NOT administrators but
experimental framework developers that either embed or extend Hadoop.
-1 for making the interface public in the sense that it's our (Hadoop
community) obligation to maintain/document the interface. I'd strongly advocate
that we reserve the right to change instrumentation interface without the usual
constraints of public APIs.
+0 if proper interface classification annotations are used i.e.:
@InterfaceAudience.Private
@InterfaceStability.Evolving
> 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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