[
https://issues.apache.org/jira/browse/MAPREDUCE-2470?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13034763#comment-13034763
]
Robert Joseph Evans commented on MAPREDUCE-2470:
------------------------------------------------
I will update the typo and move the test, thanks for the catch.
I will also investigate the other Downgrade methods. I believe that none of
them will ever be called with a null, unless something is seriously wrong, but
I will investigate to be sure.
> 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
> Attachments: MAPREDUCE-2470-v1.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)
--
This message is automatically generated by JIRA.
For more information on JIRA, see: http://www.atlassian.com/software/jira
