Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/11735#discussion_r56219892
--- Diff: core/src/main/scala/org/apache/spark/SparkContext.scala ---
@@ -1278,12 +1278,8 @@ class SparkContext(config: SparkConf) extends
Logging with ExecutorAllocationCli
*/
def broadcast[T: ClassTag](value: T): Broadcast[T] = {
assertNotStopped()
- if (classOf[RDD[_]].isAssignableFrom(classTag[T].runtimeClass)) {
- // This is a warning instead of an exception in order to avoid
breaking user programs that
- // might have created RDD broadcast variables but not used them:
- logWarning("Can not directly broadcast RDDs; instead, call collect()
and "
- + "broadcast the result (see SPARK-5063)")
- }
+ require(!classOf[RDD[_]].isAssignableFrom(classTag[T].runtimeClass),
"Can not directly " +
--- End diff --
Nit: rather than break this string just ...
```
require(!classOf[RDD[_]].isAssignableFrom(classTag[T].runtimeClass),
"Can not directly broadcast RDDs; instead, call collect() and broadcast
the result.")
```
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