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From "Robert Joseph Evans (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-2470) Receiving NPE occasionally on RunningJob.getCounters() call
Date Wed, 11 May 2011 16:13:48 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-2470?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13031816#comment-13031816

Robert Joseph Evans commented on MAPREDUCE-2470:

We saw this issue a little while ago through pig, but I had trouble reproducing it with pig.
 I am looking into it now, and wanted to know if you could reproduce it easily and if so how?

> 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
>         Attachments: 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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