Github user andrewor14 commented on a diff in the pull request:
https://github.com/apache/spark/pull/3225#discussion_r24264861
--- Diff: core/src/main/scala/org/apache/spark/SparkContext.scala ---
@@ -630,7 +634,10 @@ class SparkContext(config: SparkConf) extends
SparkStatusAPI with Logging {
* necessary info (e.g. file name for a filesystem-based dataset, table
name for HyperTable),
* using the older MapReduce API (`org.apache.hadoop.mapred`).
*
- * @param conf JobConf for setting up the dataset
+ * @param conf JobConf for setting up the dataset. Note: This will be
put into a Broadcast.
--- End diff --
Nice find. It seems perfectly reasonable from the user's perspective to
just save `sc.hadoopConfiguration` into a val and use it for many things.
That's probably what I would have done if I didn't know about the nuances here.
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