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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-2932) Missing instrumentation plugin class shouldn't crash the TT startup per design
Date Thu, 22 Sep 2011 03:35:26 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-2932?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13112301#comment-13112301

Hadoop QA commented on MAPREDUCE-2932:

-1 overall.  Here are the results of testing the latest attachment 
  against trunk revision .

    +1 @author.  The patch does not contain any @author tags.

    +1 tests included.  The patch appears to include 2 new or modified tests.

    -1 patch.  The patch command could not apply the patch.

Console output: https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/819//console

This message is automatically generated.

> 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:
>         Attachments: 0.20-MAPREDUCE-2932.r1.diff, 0.20-MAPREDUCE-2932.r2.diff, 0.20-MAPREDUCE-2932.r3.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:
> 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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