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https://issues.apache.org/jira/browse/MAPREDUCE-2381?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13008022#comment-13008022
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Tom White commented on MAPREDUCE-2381:
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+1
> JobTracker instrumentation not consistent about error handling
> --------------------------------------------------------------
>
> Key: MAPREDUCE-2381
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-2381
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Reporter: Philip Zeyliger
> Assignee: Philip Zeyliger
> Attachments: MAPREDUCE-2381.patch.txt
>
>
> In the current code, if the class specified by the JobTracker instrumentation
> config property is not there, the JobTracker fails to start with a
> ClassNotFound. If it's there, but it can't load for whatever reason, the
> JobTracker continues with the default. Having two different error-handling
> routes is a bit confusing; I propose to move one line so that it's
> consistent. (On the TaskTracker instrumentation side, if any of the multiple
> instrumentations aren't available, the default is used.)
> The attached patch merely moves a line inside of the try block that's already
> there.
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