sarutak opened a new pull request #25296: [SPARK-28561][WEBUI] DAG viz for barrier-mode execution URL: https://github.com/apache/spark/pull/25296 ## What changes were proposed in this pull request? In the current UI, we cannot identify which RDDs are barrier. Visualizing it will make easy to debug. Following images are shown after this change.   The boxes in pale green means barrier (We might need to discuss which color is proper). ## How was this patch tested? Tested manually. The images above are shown by following operations. ``` val rdd1 = sc.parallelize(1 to 10) val rdd2 = sc.parallelize(1 to 10) val rdd3 = rdd1.zip(rdd2).barrier.mapPartitions(identity(_)) val rdd4 = rdd3.map(identity(_)) val rdd5 = rdd4.reduceByKey(_+_) rdd5.collect ```
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