Zhijie Shen created MAPREDUCE-5831:
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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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