[MAPREDUCE-5957] AM throws ClassNotFoundException with job classloader enabled if custom output format/committer is used

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.4.0
• Fix Version/s: 2.6.0
• Target Version/s: 2.6.0
• Hadoop Flags: Reviewed
• Assignee: Sangjin Lee
• Reporter: Sangjin Lee
• Created: 02/Jul/14 05:08
• Updated: 01/Dec/14 03:09
• Resolved: 21/Jul/14 18:23

Description

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

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

Issue Links

• is related to: MAPREDUCE-5751 MR app master fails to start in some cases if mapreduce.job.classloader is true
• relates to: MAPREDUCE-5813 YarnChild does not load job.xml with mapreduce.job.classloader=true