Guibo-Pan commented on issue #6544: [FLINK-8532] [Streaming] modify RebalancePartitioner to use a random partition as its first partition URL: https://github.com/apache/flink/pull/6544#issuecomment-416913773 @StephanEwen Thanks for your suggestion. I've made an update to it. For further optimization, the one-channel-only selector which always returns just `0`, can be used instead of using `ShufflePartitioner` or `RebalancePartitioner` where outputs have only one channel. It seems that we have a `ForwardPartitioner` already which always returns 0. And it could be an optimization in the process during building the job graph, maybe in another new issue.
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