Github user pwendell commented on a diff in the pull request:
https://github.com/apache/spark/pull/3670#discussion_r22501959
--- Diff: core/src/main/scala/org/apache/spark/SparkContext.scala ---
@@ -978,6 +979,26 @@ class SparkContext(config: SparkConf) extends Logging {
}
/**
+ * Add a directory to be downloaded with this Spark job on every node.
+ * The `path` passed must be a directory in HDFS (or other
Hadoop-supported
+ * filesystems). To access the directory in Spark jobs, use
+ * `SparkFiles.get(directoryName)` to find its download location.
--- End diff --
It would be good to say that the directory will be recursively copied into
the root of Spark's scratch directory.
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