jiangxb1987 commented on a change in pull request #28986:
URL: https://github.com/apache/spark/pull/28986#discussion_r449314949
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File path: core/src/main/scala/org/apache/spark/SparkContext.scala
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@@ -2554,6 +2557,19 @@ object SparkContext extends Logging {
}
}
+ /**
+ * Called to ensure that SparkContext is created or accessed only on the
Driver.
+ *
+ * Throws an exception if a SparkContext is about to be created in executors.
+ */
+ private[spark] def assertOnDriver(): Unit = {
+ if (TaskContext.get != null) {
Review comment:
Have you tested this under local mode?
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