Github user andrewor14 commented on a diff in the pull request:
https://github.com/apache/spark/pull/1616#discussion_r18259213
--- Diff: core/src/main/scala/org/apache/spark/util/Utils.scala ---
@@ -313,15 +313,84 @@ private[spark] object Utils extends Logging {
}
/**
- * Download a file requested by the executor. Supports fetching the file
in a variety of ways,
+ * Download a file to target directory. 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 to a local
cache that's shared
+ * across executors running the same application. `useCache` is used
mainly for
+ * the the executors, not in local mode.
--- End diff --
the the
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