Github user andrewor14 commented on a diff in the pull request:
https://github.com/apache/spark/pull/1616#discussion_r17616757
--- Diff: core/src/main/scala/org/apache/spark/util/Utils.scala ---
@@ -313,15 +313,83 @@ private[spark] object Utils extends Logging {
}
/**
+ * Download a file requested by the executor . Supports fetching the
file in a variety of ways,
+ * including HTTP, HDFS and files on a standard filesystem, based on the
URL parameter.
+ *
+ * If `useCache` is true, first attempts to fetch the file from a local
cache that's shared across
+ * executors running the same application.
--- End diff --
Maybe add a comment to say this is used mainly for the executors, and not
in local mode?
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