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From "Zhijie Shen (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MAPREDUCE-5831) Old MR client is not compatible with new MR application
Date Fri, 11 Apr 2014 17:24:15 GMT
Zhijie Shen created MAPREDUCE-5831:
--------------------------------------

             Summary: Old MR client is not compatible with new MR application
                 Key: MAPREDUCE-5831
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-5831
             Project: Hadoop Map/Reduce
          Issue Type: Bug
          Components: client, mr-am
    Affects Versions: 2.3.0, 2.2.0
            Reporter: Zhijie Shen
            Priority: Critical


Recently, we saw the following scenario:

1. The user setup a cluster of hadoop 2.3., which contains YARN 2.3 and MR  2.3.

2. The user client on a machine that MR 2.2 is installed and in the classpath.

Then, when the user submitted a simple wordcount job, he saw the following message:
{code}
16:00:41,027  INFO main mapreduce.Job:1345 -  map 100% reduce 100%
16:00:41,036  INFO main mapreduce.Job:1356 - Job job_1396468045458_0006 completed successfully
16:02:20,535  WARN main mapreduce.JobRunner:212 - Cannot start job [wordcountJob]
java.lang.IllegalArgumentException: No enum constant org.apache.hadoop.mapreduce.JobCounter.MB_MILLIS_REDUCES
	at java.lang.Enum.valueOf(Enum.java:236)
	at org.apache.hadoop.mapreduce.counters.FrameworkCounterGroup.valueOf(FrameworkCounterGroup.java:148)
	at org.apache.hadoop.mapreduce.counters.FrameworkCounterGroup.findCounter(FrameworkCounterGroup.java:182)
	at org.apache.hadoop.mapreduce.counters.AbstractCounters.findCounter(AbstractCounters.java:154)
	at org.apache.hadoop.mapreduce.TypeConverter.fromYarn(TypeConverter.java:240)
	at org.apache.hadoop.mapred.ClientServiceDelegate.getJobCounters(ClientServiceDelegate.java:370)
	at org.apache.hadoop.mapred.YARNRunner.getJobCounters(YARNRunner.java:511)
	at org.apache.hadoop.mapreduce.Job$7.run(Job.java:756)
	at org.apache.hadoop.mapreduce.Job$7.run(Job.java:753)
	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:1491)
	at org.apache.hadoop.mapreduce.Job.getCounters(Job.java:753)
	at org.apache.hadoop.mapreduce.Job.monitorAndPrintJob(Job.java:1361)
	at org.apache.hadoop.mapreduce.Job.waitForCompletion(Job.java:1289)
        . . .
{code}

The problem is that the wordcount job was running on one or more than one nodes of the YARN
cluster, where MR 2.3 libs were installed, and JobCounter.MB_MILLIS_REDUCES is available in
the counters. On the other side, due to the classpath setting, the client was likely to run
with MR 2.2 libs. After the client retrieved the counters from MR AM, it tried to construct
the Counter object with the received counter name. Unfortunately, the enum didn't exist in
the client's classpath. Therefore, "No enum constant" exception is thrown here.

JobCounter.MB_MILLIS_REDUCES is brought to MR2 via MAPREDUCE-5464 since Hadoop 2.3.



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