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From "Aaron Baff (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MAPREDUCE-2470) Receiving NPE occasionally on RunningJob.getCounters() call
Date Tue, 03 May 2011 22:09:04 GMT
Receiving NPE occasionally on RunningJob.getCounters() call

                 Key: MAPREDUCE-2470
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2470
             Project: Hadoop Map/Reduce
          Issue Type: Bug
          Components: client
    Affects Versions: 0.21.0
         Environment: FreeBSD, Java6, Hadoop r0.21.0
            Reporter: Aaron Baff

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.

            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)

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