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https://issues.apache.org/jira/browse/MAPREDUCE-6293?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14497537#comment-14497537
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Sangjin Lee commented on MAPREDUCE-6293:
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JVM normally sets the default classloader (sun.misc.Launcher$AppClassLoader) as
the TCCL on the main thread (from which other threads inherit it), so in most
cases the TCCL is just the default classloader. But I think it's a good idea to
add a logging statement to print out the TCCL here. I'll update the patch
shortly.
> uberized job fails with the job classloader enabled
> ---------------------------------------------------
>
> Key: MAPREDUCE-6293
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-6293
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: mr-am
> Affects Versions: 2.6.0
> Reporter: Sangjin Lee
> Assignee: Sangjin Lee
> Attachments: MAPREDUCE-6293.001.patch
>
>
> An uberized job fails if the job classloader is enabled and the job needs to
> use the thread context classloader to load a class. Some example error in the
> log:
> {quote}
> 2015-03-23 23:28:34,675 INFO [main\]
> org.apache.hadoop.mapreduce.v2.util.MRApps: Creating job classloader
> ...
> 2015-03-23 23:28:42,096 ERROR [uber-SubtaskRunner\]
> cascading.provider.ServiceLoader: unable to find service class:
> cascading.tuple.hadoop.collect.HadoopTupleMapFactory, with exception:
> java.lang.ClassNotFoundException:
> cascading.tuple.hadoop.collect.HadoopTupleMapFactory
> {quote}
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