Github user sryza commented on a diff in the pull request:
https://github.com/apache/spark/pull/7874#discussion_r36062508
--- Diff: core/src/main/scala/org/apache/spark/SparkContext.scala ---
@@ -113,6 +113,7 @@ class SparkContext(config: SparkConf) extends Logging
with ExecutorAllocationCli
/**
* :: DeveloperApi ::
* Alternative constructor for setting preferred locations where Spark
will create executors.
+ * Note that preferred locations feature does not work as it is supposed
to, see SPARK-8949
--- End diff --
I would be more explicit and say that passing in preferred node location
data has no effect at all.
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