Github user srowen commented on the pull request:
https://github.com/apache/spark/pull/5354#issuecomment-92532627
That ship may have sailed for better or worse. Yes we have to be careful
about bringing things into core, so I'm glad to see the exclusions, but I think
there are simpler and less brittle ways.
In general if two components need to agree on a particular version of a
dependency, that is resolved in `dependencyManagement` in the parent.
`exclusions` is not a great way to do it; as soon as, maybe, the other
components stops using X that Tachyon needs, now there are 0 copies of it. So
that's still the question -- if there are conflicts, what are they, and why not
manage the dependency directly?
The `hadoop-core` stuff is maybe more cosmetic. If `tachyon-client` works
fine without it, then perhaps it and other dependencies from upstream are
merely redundant? at the least, I'd be sort of surprised if lots of these
non-client, server-side libraries are _directly_ used by the client. This seems
like maybe it's also trying to exclude a bunch of transient dependencies of
something already excluded.
You could say that the exclusions really don't hurt much, or if they do we
know it quickly, but I think it's worth double-checking the above first, as
this exclusion declaration looks surprising. Goodness knows it is necessary in
some cases with Hadoop stuff though -- usually to exclude the *same* code under
*different artifact names* because upstream projects made uber-jars or shaded.
(Looking at you, Jetty)
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