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Apache Spark commented on SPARK-20288: -------------------------------------- User 'jinxing64' has created a pull request for this issue: https://github.com/apache/spark/pull/17603 > ImproveĀ BasicSchedulerIntegrationSuite "multi-stage job" > -------------------------------------------------------- > > Key: SPARK-20288 > URL: https://issues.apache.org/jira/browse/SPARK-20288 > Project: Spark > Issue Type: Bug > Components: Spark Core > Affects Versions: 2.1.0 > Reporter: jin xing > Priority: Minor > > ShuffleId is determined before job submitted. But it's hard to predict > stageId by shuffleId. > Stage is created in DAGScheduler( > https://github.com/apache/spark/blob/master/core/src/main/scala/org/apache/spark/scheduler/DAGScheduler.scala#L381), > but the order is n > ot determined. > I added a log(println(s"Creating ShufflMapStage-$id on > shuffle-${shuffleDep.shuffleId}")) after > (https://github.com/apache/spark/blob/master/core/src/main/scala/org/apache/spark/scheduler/DAGScheduler.scala#L331), > when testing BasicSchedulerIntegrationSuite:"multi-stage job". It will print: > Creating ShufflMapStage-0 on shuffle-0 > Creating ShufflMapStage-1 on shuffle-2 > Creating ShufflMapStage-2 on shuffle-1 > Creating ShufflMapStage-3 on shuffle-3 > or > Creating ShufflMapStage-0 on shuffle-1 > Creating ShufflMapStage-1 on shuffle-3 > Creating ShufflMapStage-2 on shuffle-0 > Creating ShufflMapStage-3 on shuffle-2 > So It might be better to avoid generating the MapStatus by stageId. -- This message was sent by Atlassian JIRA (v6.3.15#6346) --------------------------------------------------------------------- To unsubscribe, e-mail: issues-unsubscr...@spark.apache.org For additional commands, e-mail: issues-h...@spark.apache.org