Github user srowen commented on the pull request:
https://github.com/apache/spark/pull/770#issuecomment-43127826
I think the difference is that Spark is distributing its dependencies too
in the assembly, whereas I am not sure Hadoop et al. do more than distribute
their own artifacts. If that's the not correct, then yeah it's very possible
Hadoop doesn't get it right.
I am pretty confident that this is the right thing to do for Spark, and
went back to close-read the official word on what goes where. It surprised me a
little too. Better safe than sorry, and I think it's buttoned up now to the
best of a reasonable person's ability. Thanks for integrating it.
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