Ngone51 edited a comment on issue #28117: [SPARK-31344][CORE] Polish implementation of barrier() and allGather() URL: https://github.com/apache/spark/pull/28117#issuecomment-608968979 This PR tried to address comment https://github.com/apache/spark/pull/27395#pullrequestreview-357681136 , but please note that we can not simply build `barrier()` on top of `allGather("")`, because we need a way do distinguish these two different calls to prevent following illegal case: ```scala rdd.barrier().mapPartitions { iter => val context = BarrierTaskContext.get() val partitionId = context.partitionId if (partitionId == 0) { context.barrier() } else { context.allGather(partitionId.toString) } iter } ``` ping @sarthfrey @jiangxb1987 @mengxr Please take a look, thanks!
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