azagrebin edited a comment on issue #8646: [FLINK-12735][network] Make shuffle environment implementation independent with IOManager URL: https://github.com/apache/flink/pull/8646#issuecomment-506313023 @StephanEwen Thanks for bringing this up. As @zhijiangW already described, true, the idea was to drop `IOManager` dependency in Shuffle Service API because `NettyShuffleEnviroment` basically uses only narrowed scope of IOManager, namely switching between temporary files. The valid concern is that if we decide to use `IOManagerAsync` with its threads then the threads should be shared by all IO components which use them. In that case Shuffle Service API has to accept it as a dependency created outside. As discussed offline, if we decide later that we need `IOManagerAsync` for shuffling then we can revert the change and add the abstract/interface `IOManager` back to `ShuffleEnvironmentContext`.
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