Github user squito commented on a diff in the pull request:
https://github.com/apache/spark/pull/4435#discussion_r27994632
--- Diff: project/plugins.sbt ---
@@ -29,6 +29,8 @@ addSbtPlugin("com.eed3si9n" % "sbt-unidoc" % "0.3.1")
addSbtPlugin("com.cavorite" % "sbt-avro" % "0.3.2")
+addSbtPlugin("io.spray" % "sbt-revolver" % "0.7.2")
--- End diff --
no, this is definitely not necessary. It was extremely useful to me during
development, and figured it was a good addition in general.
This plugin lets you easily start & stop long-running processes (like the
history server which never dies) within an sbt session, without having to kill
& restart sbt. You just run `re-start` to launch your main program, but it
gives you the sbt shell back, so you can run more commands, and eventually run
`re-stop`.
I figured it was harmless to drop in here as well, but I'll move to a
separate PR.
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