Github user ktoso commented on a diff in the pull request:
https://github.com/apache/spark/pull/21366#discussion_r194736679
--- Diff: pom.xml ---
@@ -760,6 +760,12 @@
<version>1.10.19</version>
<scope>test</scope>
</dependency>
+ <dependency>
--- End diff --
Seems some confusion is here?
Akka Streams does not depend on Rx of course, they both alternative
implementations of Reactive Streams ( http://reactive-streams.org/ ) which have
been included in JDK9 as `java.util.concurrent.Flow.*` and Akka also implements
those, but does not require JDK9; you can use JDK8 + RS and if you use JDK9 you
could use the JDK's types but it's not required.
Anything else I should clarify or review here? For inter-op purposes it
would be good to not expose on a specific implementation but expose the
reactive-streams types (`org.reactivestreams.Publisher` etc), but that only
matters if the types are exposed. As for including dependencies in core Spark
-- I would expect this to carry quite a bit of implications though don't know
Spark's rules about it (ofc less dependencies == better for users, since less
chances to version-clash with libraries they'd use)
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