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https://issues.apache.org/jira/browse/MAPREDUCE-2932?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13109858#comment-13109858
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Eli Collins commented on MAPREDUCE-2932:
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Mind making your new test junit4 sytle? Otherwise, looks great!
> Missing instrumentation plugin class shouldn't crash the TT startup per design
> ------------------------------------------------------------------------------
>
> Key: MAPREDUCE-2932
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-2932
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: tasktracker
> Reporter: Harsh J
> Assignee: Harsh J
> Priority: Trivial
> Fix For: 0.20.206.0
>
> Attachments: 0.20-MAPREDUCE-2932.r1.diff, 0.20-MAPREDUCE-2932.r2.diff
>
>
> Per the implementation of the TaskTracker instrumentation plugin
> implementation (from 2008), a ClassNotFoundException during loading up of an
> configured TaskTracker instrumentation class shouldn't have hampered TT start
> up at all.
> But, there is one class-fetching call outside try/catch, which makes TT fall
> down with a RuntimeException if there's a class not found. Would be good to
> include this line into the try/catch itself.
> Strace would appear as:
> {code}
> 2011-08-25 11:45:38,470 ERROR org.apache.hadoop.mapred.TaskTracker: Can not
> start task tracker because java.lang.RuntimeException:
> java.lang.RuntimeException: java.lang.ClassNotFoundException:
> org.apache.hadoop.mapred.CustomInstPlugin
> at org.apache.hadoop.conf.Configuration.getClass(Configuration.java)
> at
> org.apache.hadoop.mapred.TaskTracker.getInstrumentationClass(TaskTracker.java)
>
> at org.apache.hadoop.mapred.TaskTracker.initialize(TaskTracker.java)
> {code}
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