Sean Busbey commented on HBASE-20332:

yay! workaround via {{HADOOP_USER_CLASSPATH_FIRST=true}} looks good.

> shaded mapreduce module shouldn't include hadoop
> ------------------------------------------------
>                 Key: HBASE-20332
>                 URL: https://issues.apache.org/jira/browse/HBASE-20332
>             Project: HBase
>          Issue Type: Sub-task
>          Components: mapreduce, shading
>    Affects Versions: 2.0.0
>            Reporter: Sean Busbey
>            Assignee: Sean Busbey
>            Priority: Critical
>             Fix For: 2.0.0
>         Attachments: HBASE-20332.0.patch
> AFAICT, we should just entirely skip including hadoop in our shaded mapreduce 
> module
> 1) Folks expect to run yarn / mr apps via {{hadoop jar}} / {{yarn jar}}
> 2) those commands include all the needed Hadoop jars in your classpath by 
> default (both client side and in the containers)
> 3) If you try to use "user classpath first" for your job as a workaround 
> (e.g. for some library your application needs that hadoop provides) then our 
> inclusion of *some but not all* hadoop classes then causes everything to fall 
> over because of mixing rewritten and non-rewritten hadoop classes
> 4) if you don't use "user classpath first" then all of our 
> non-relocated-but-still-shaded hadoop classes are ignored anyways so we're 
> just wasting space

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