Github user pwendell commented on a diff in the pull request:
https://github.com/apache/spark/pull/3523#discussion_r21643415
--- Diff: docs/building-spark.md ---
@@ -145,7 +145,15 @@ We use the scala-maven-plugin which supports
incremental and continuous compilat
mvn scala:cc
-should run continuous compilation (i.e. wait for changes). However, this
has not been tested extensively.
+should run continuous compilation (i.e. wait for changes). However, this
has not been tested
+extensively. A couple of gotchas to note:
+* it only scans the paths `src/main` and `src/test` (see
+[docs](http://scala-tools.org/mvnsites/maven-scala-plugin/usage_cc.html)),
so it will only work
+from within certain submodules that have that structure.
+* compiling submodules that depend on other submodules (e.g. `core`, which
depends on `network/common` and `network/shuffle`) requires those dependencies
--- End diff --
This is a pretty complicated description. Instead can we just say that this
requires first running "mvn install"? Or even just do a "mvn install" in the
code example above before you run it?
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