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From "Philip Zeyliger (JIRA)" <j...@apache.org>
Subject [jira] Updated: (MAPREDUCE-2043) TaskTrackerInstrumentation and JobTrackerInstrumentation should be public
Date Mon, 30 Aug 2010 18:09:54 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-2043?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Philip Zeyliger updated MAPREDUCE-2043:

    Attachment: MAPREDUCE-2043.patch.txt

Patch attached.  Here are the changed lines, to save people some clicks:

-class JobTrackerInstrumentation {
+public class JobTrackerInstrumentation {
-class TaskTrackerInstrumentation  {
+public class TaskTrackerInstrumentation  {

> 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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