Github user vanzin commented on a diff in the pull request:
https://github.com/apache/spark/pull/2516#discussion_r18068214
--- Diff: core/src/main/scala/org/apache/spark/util/Utils.scala ---
@@ -1479,6 +1479,14 @@ private[spark] object Utils extends Logging {
PropertyConfigurator.configure(pro)
}
+ /**
+ * Flatten a map of maps out into a single map, later maps in the
propList
--- End diff --
Actually the code does the opposite of what this is saying. Because of
`reverse`, if you call this as `merge(m1, m2)`, all the values in `m1` will
override the ones that are in `m2` with the same key.
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