[MAPREDUCE-5166] ConcurrentModificationException in LocalJobRunner

• Type: Bug
• Status: Closed
• Priority: Blocker
• Resolution: Fixed
• Affects Version/s: 1.2.0, 2.0.4-alpha
• Fix Version/s: 1.2.0, 2.1.0-beta
• Assignee: Sandy Ryza
• Reporter: Gunther Hagleitner
• Created: 18/Apr/13 18:29
• Updated: 10/May/16 07:39
• Resolved: 25/Apr/13 00:56

Description

With the latest version hive unit tests fail in various places with the following stack trace. The problem seems related to: MAPREDUCE-2931

    [junit] java.util.ConcurrentModificationException
    [junit] 	at java.util.HashMap$HashIterator.nextEntry(HashMap.java:793)
    [junit] 	at java.util.HashMap$ValueIterator.next(HashMap.java:822)
    [junit] 	at org.apache.hadoop.mapred.Counters.incrAllCounters(Counters.java:505)
    [junit] 	at org.apache.hadoop.mapred.Counters.sum(Counters.java:528)
    [junit] 	at org.apache.hadoop.mapred.LocalJobRunner$Job.getCurrentCounters(LocalJobRunner.java:490)
    [junit] 	at org.apache.hadoop.mapred.LocalJobRunner.getJobCounters(LocalJobRunner.java:634)
    [junit] 	at org.apache.hadoop.mapred.JobClient$NetworkedJob.getCounters(JobClient.java:418)
    [junit] 	at org.apache.hadoop.hive.ql.exec.HadoopJobExecHelper$ExecDriverTaskHandle.getCounters(HadoopJobExecHelper.java:465)
    [junit] 	at org.apache.hadoop.hive.ql.exec.HadoopJobExecHelper.progress(HadoopJobExecHelper.java:300)
    [junit] 	at org.apache.hadoop.hive.ql.exec.HadoopJobExecHelper.progress(HadoopJobExecHelper.java:532)
    [junit] 	at org.apache.hadoop.hive.ql.exec.ExecDriver.execute(ExecDriver.java:453)
    [junit] 	at org.apache.hadoop.hive.ql.exec.ExecDriver.main(ExecDriver.java:681)
    [junit] 	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    [junit] 	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    [junit] 	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    [junit] 	at java.lang.reflect.Method.invoke(Method.java:597)
    [junit] 	at org.apache.hadoop.util.RunJar.main(RunJar.java:160)

Issue Links

• is broken by: MAPREDUCE-2931 CLONE - LocalJobRunner should support parallel mapper execution