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https://issues.apache.org/jira/browse/MAPREDUCE-5957?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14064149#comment-14064149
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Sangjin Lee commented on MAPREDUCE-5957:
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bq. Do you think it's worth adding a wrapper form that can throw Exception (or
maybe just IOException)?
Sure. I'll add an overloaded method that can throw an IOException. I did notice
that when I was playing with the wrapper method, and was thinking about adding
another version.
bq. Is there a reason the init transition calls
MRAppMaster.createJobClassloader rather than having MRAppMaster.serviceInit do
it?
Nothing other than that I wanted to create it as early as possible. There is a
fair amount of code between the beginning of that method and serviceInit(). But
I think it is fine to do it inside MRAppMaster.serviceInit(). I'll change that.
bq. it would be nice to clean that up by either removing the argument or use it
rather than the committer member.
I'd be happy to do it. I'll fix that too.
> AM throws ClassNotFoundException with job classloader enabled if custom
> output format/committer is used
> -------------------------------------------------------------------------------------------------------
>
> Key: MAPREDUCE-5957
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-5957
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Affects Versions: 2.4.0
> Reporter: Sangjin Lee
> Assignee: Sangjin Lee
> Attachments: MAPREDUCE-5957.patch, MAPREDUCE-5957.patch,
> MAPREDUCE-5957.patch, MAPREDUCE-5957.patch
>
>
> 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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