Hadoop Map/Reduce
  1. Hadoop Map/Reduce
  2. MAPREDUCE-2470

Receiving NPE occasionally on RunningJob.getCounters() call

    Details

    • Type: Bug Bug
    • Status: Closed
    • Priority: Major Major
    • Resolution: Fixed
    • Affects Version/s: 0.21.0
    • Fix Version/s: 0.23.0
    • Component/s: client
    • Labels:
      None
    • Environment:

      FreeBSD, Java6, Hadoop r0.21.0

    • Hadoop Flags:
      Reviewed

      Description

      This is running in a Java daemon that is used as an interface (Thrift) to get information and data from MR Jobs. Using JobClient.getJob(JobID) I successfully get a RunningJob object (I'm checking for NULL), and then rarely I get an NPE when I do RunningJob.getCounters(). This seems to occur after the daemon has been up and running for a while, and in the event of an Exception, I close the JobClient, set it to NULL, and a new one should then be created on the next request for data. Yet, I still seem to be unable to fetch the Counters. Below is the stack trace.

      java.lang.NullPointerException
      at org.apache.hadoop.mapred.Counters.downgrade(Counters.java:77)
      at org.apache.hadoop.mapred.JobClient$NetworkedJob.getCounters(JobClient.java:381)
      at com.telescope.HadoopThrift.service.ServiceImpl.getReportResults(ServiceImpl.java:350)
      at com.telescope.HadoopThrift.gen.HadoopThrift$Processor$getReportResults.process(HadoopThrift.java:545)
      at com.telescope.HadoopThrift.gen.HadoopThrift$Processor.process(HadoopThrift.java:421)
      at org.apache.thrift.server.TNonblockingServer$FrameBuffer.invoke(TNonblockingServer.java:697)
      at org.apache.thrift.server.THsHaServer$Invocation.run(THsHaServer.java:317)
      at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
      at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
      at java.lang.Thread.run(Thread.java:619)

      1. counters_null_data.pcap
        1.0 kB
        Aaron Baff
      2. MAPREDUCE-2470-v1.patch
        2 kB
        Robert Joseph Evans
      3. MAPREDUCE-2470-v2.patch
        5 kB
        Robert Joseph Evans
      4. MAPREDUCE-2470-v3.patch
        7 kB
        Robert Joseph Evans

        Activity

          People

          • Assignee:
            Robert Joseph Evans
            Reporter:
            Aaron Baff
          • Votes:
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            Dates

            • Created:
              Updated:
              Resolved:

              Development