Sangjin Lee created YARN-2245:
---------------------------------

             Summary: AM throws ClassNotFoundException with job classloader 
enabled if custom output format/committer is used
                 Key: YARN-2245
                 URL: https://issues.apache.org/jira/browse/YARN-2245
             Project: Hadoop YARN
          Issue Type: Bug
    Affects Versions: 2.4.0
            Reporter: Sangjin Lee
            Assignee: Sangjin Lee


With the job classloader enabled, the MR AM throws ClassNotFoundException if a 
custom output format class is specified.

{noformat}
org.apache.hadoop.yarn.exceptions.YarnRuntimeException: 
java.lang.RuntimeException: java.lang.ClassNotFoundException: Class 
com.foo.test.TestOutputFormat not found
        at 
org.apache.hadoop.mapreduce.v2.app.MRAppMaster.createOutputCommitter(MRAppMaster.java:473)
        at 
org.apache.hadoop.mapreduce.v2.app.MRAppMaster.serviceInit(MRAppMaster.java:374)
        at 
org.apache.hadoop.service.AbstractService.init(AbstractService.java:163)
        at 
org.apache.hadoop.mapreduce.v2.app.MRAppMaster$1.run(MRAppMaster.java:1459)
        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:1548)
        at 
org.apache.hadoop.mapreduce.v2.app.MRAppMaster.initAndStartAppMaster(MRAppMaster.java:1456)
        at 
org.apache.hadoop.mapreduce.v2.app.MRAppMaster.main(MRAppMaster.java:1389)
Caused by: java.lang.RuntimeException: java.lang.ClassNotFoundException: Class 
com.foo.test.TestOutputFormat not found
        at 
org.apache.hadoop.conf.Configuration.getClass(Configuration.java:1895)
        at 
org.apache.hadoop.mapreduce.task.JobContextImpl.getOutputFormatClass(JobContextImpl.java:222)
        at 
org.apache.hadoop.mapreduce.v2.app.MRAppMaster.createOutputCommitter(MRAppMaster.java:469)
        ... 8 more
Caused by: java.lang.ClassNotFoundException: Class 
com.foo.test.TestOutputFormat not found
        at 
org.apache.hadoop.conf.Configuration.getClassByName(Configuration.java:1801)
        at 
org.apache.hadoop.conf.Configuration.getClass(Configuration.java:1893)
        ... 10 more
{noformat}



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