Github user ggevay commented on the pull request:
https://github.com/apache/flink/pull/1517#issuecomment-173997370
Quick question: Is there a reason why there is no chained version of
ReduceCombineDriver? (GroupReduceDriver and AllReduceDriver both have chained
versions: SynchronousChainedCombineDriver and ChainedAllReduceDriver.) If it is
just because no one got around to it yet, then I'll open a JIRA and implement
it quickly.
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