Github user mgummelt commented on a diff in the pull request:
https://github.com/apache/spark/pull/17723#discussion_r119240814
--- Diff: core/pom.xml ---
@@ -357,6 +357,34 @@
<groupId>org.apache.commons</groupId>
<artifactId>commons-crypto</artifactId>
</dependency>
+
+ <!--
+ Testing Hive reflection needs hive on the test classpath only.
--- End diff --
We went back in forth on this in the main thread, which is admittedly long
and hard to follow at this point. Here's the same concern laid out by mridulm:
https://github.com/apache/spark/pull/17723#issuecomment-298222247
We ultimately decided that it would be acceptable to add these
dependencies, so long as we don't expose them in the public Spark interfaces.
Here's a comment to that effect:
https://github.com/apache/spark/pull/17723#issuecomment-298463750
The reason they're required is that this PR moves the Hadoop delegation
token providers from the yarn module into the core module, so that other
resource managers, such as Mesos, can also fetch delegation tokens to access
secure hadoop services. One of those delegation token providers is Hive:
https://github.com/apache/spark/pull/17723/files#diff-8be1059872a069d1bb4c5fc3ca394968
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