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  1. Hadoop Map/Reduce
  2. MAPREDUCE-2932

Missing instrumentation plugin class shouldn't crash the TT startup per design

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Details

    • Bug
    • Status: Closed
    • Trivial
    • Resolution: Fixed
    • None
    • 1.1.0
    • tasktracker
    • None
    • Reviewed

    Description

      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:

      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) 
      

      Attachments

        1. 0.20-MAPREDUCE-2932.r1.diff
          2 kB
          Harsh J
        2. 0.20-MAPREDUCE-2932.r2.diff
          5 kB
          Harsh J
        3. 0.20-MAPREDUCE-2932.r3.diff
          5 kB
          Harsh J

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            qwertymaniac Harsh J
            qwertymaniac Harsh J
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