[
https://issues.apache.org/jira/browse/MAPREDUCE-6293?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14497445#comment-14497445
]
Sangjin Lee commented on MAPREDUCE-6293:
----------------------------------------
Thanks [~jira.shegalov] for the review!
I checked for null there in the abundance of caution because if
{{jobClassLoader}} was null {{setContextClassLoader()}} would also set the
thread's context classloader to null. If the inherited context classloader was
not null initially, then it would have an effect of nulling out that TCCL. So
to be safe, we should not be calling {{setContextClassLoader()}} unless we're
truly overriding it, no?
> 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}
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
