Github user vanzin commented on a diff in the pull request:
https://github.com/apache/spark/pull/6394#discussion_r31570771
--- Diff:
yarn/src/main/scala/org/apache/spark/deploy/yarn/YarnAllocator.scala ---
@@ -135,6 +135,11 @@ private[yarn] class YarnAllocator(
}
}
+ // Maintain a map of preferredNodeLocation to use.
+ private val preferredNodeLocationToUses = new HashMap[String, Boolean]
+ // Maintain a preferred map of rack
--- End diff --
similarly, map vs. set
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