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https://issues.apache.org/jira/browse/MAPREDUCE-2470?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13039054#comment-13039054
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Hudson commented on MAPREDUCE-2470:
-----------------------------------
Integrated in Hadoop-Mapreduce-trunk-Commit #700 (See
[https://builds.apache.org/hudson/job/Hadoop-Mapreduce-trunk-Commit/700/])
MAPREDUCE-2470. Fix NPE in RunningJobs::getCounters.
Contributed by Robert Joseph Evans
cdouglas :
http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1127444
Files :
* /hadoop/mapreduce/trunk/CHANGES.txt
*
/hadoop/mapreduce/trunk/src/test/mapred/org/apache/hadoop/mapred/TestNetworkedJob.java
*
/hadoop/mapreduce/trunk/src/java/org/apache/hadoop/mapreduce/protocol/ClientProtocol.java
* /hadoop/mapreduce/trunk/src/java/org/apache/hadoop/mapred/RunningJob.java
*
/hadoop/mapreduce/trunk/src/test/system/test/org/apache/hadoop/mapred/TestTaskKilling.java
* /hadoop/mapreduce/trunk/src/java/org/apache/hadoop/mapred/JobClient.java
> 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
> Assignee: Robert Joseph Evans
> Fix For: 0.23.0
>
> Attachments: MAPREDUCE-2470-v1.patch, MAPREDUCE-2470-v2.patch,
> MAPREDUCE-2470-v3.patch, counters_null_data.pcap
>
>
> 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)
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