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From "Junping Du (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MAPREDUCE-6361) NPE issue in shuffle caused by concurrent issue between copySucceeded() in one thread and copyFailed() in another thread on the same host
Date Mon, 11 May 2015 15:37:00 GMT
Junping Du created MAPREDUCE-6361:
-------------------------------------

             Summary: NPE issue in shuffle caused by concurrent issue between copySucceeded()
in one thread and copyFailed() in another thread on the same host
                 Key: MAPREDUCE-6361
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-6361
             Project: Hadoop Map/Reduce
          Issue Type: Bug
            Reporter: Junping Du
            Assignee: Junping Du


The failure in log:
2015-05-08 21:00:00,513 WARN [main] org.apache.hadoop.mapred.YarnChild: Exception running
child : org.apache.hadoop.mapreduce.task.reduce.Shuffle$ShuffleError: error in shuffle in
fetcher#25
         at org.apache.hadoop.mapreduce.task.reduce.Shuffle.run(Shuffle.java:134)
         at org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:376)
         at org.apache.hadoop.mapred.YarnChild$2.run(YarnChild.java:163)
         at java.security.AccessController.doPrivileged(Native Method)
         at javax.security.auth.Subject.doAs(Subject.java:415)
         at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1628)
         at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:158)
Caused by: java.lang.NullPointerException
         at org.apache.hadoop.mapreduce.task.reduce.ShuffleSchedulerImpl.copyFailed(ShuffleSchedulerImpl.java:267)
         at org.apache.hadoop.mapreduce.task.reduce.Fetcher.copyFromHost(Fetcher.java:308)
         at org.apache.hadoop.mapreduce.task.reduce.Fetcher.run(Fetcher.java:193)



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