Github user steveloughran commented on a diff in the pull request:
https://github.com/apache/spark/pull/12004#discussion_r89315595
--- Diff: pom.xml ---
@@ -2558,6 +2660,26 @@
</modules>
</profile>
+ <!--
+ The cloud profile enables the cloud module.
+ It does not declare the hadoop-* artifacts which
+ the cloud module pulls in; these are delegated to
+ the hadoop-x.y protocols, so permitting different
+ hadoop versions to declare different include/exclude
+ rules (especially transient dependencies).
+
+ To use this profile, the hadoop-2.7 profile must also
--- End diff --
you'd never want to have cloud without hadoop-2.7, but you may want to do
hadoop-2.7 without cloud. That really mattered on spark-1.6, as it would make
for a very large spark-assembly; in 2.x it will result in more files in
SPARK_HOME/jars, and for a bigger spark tarball.
I'd left it as an option, as with hive, mesos and yarn. However, if you do
try to build without hadoop-2.7 set, things won't build
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