Github user tgravescs commented on a diff in the pull request:
https://github.com/apache/spark/pull/2676#discussion_r19823688
--- Diff: core/src/main/scala/org/apache/spark/SparkContext.scala ---
@@ -641,6 +641,7 @@ class SparkContext(config: SparkConf) extends Logging {
kClass: Class[K],
vClass: Class[V],
conf: Configuration = hadoopConfiguration): RDD[(K, V)] = {
+ // mapreduce.Job (NewHadoopJob) merges any credentials for you.
--- End diff --
This was just saying that the call to "new NewHadoopJob" adds the
credentials to the conf passed in for you, so we don't need an explicit call to
SparkHadoopUtil.get.addCredentials(jconf).
I can try to rephrase
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