pnowojski commented on issue #7713: [FLINK-10995][network] Copy intermediate serialization results only once for broadcast mode URL: https://github.com/apache/flink/pull/7713#issuecomment-469315464 `Watermark` and `StreamStatus` I was aware of, I was a bit unsure that you have found some other use cases :) I wouldn't expect that emitting `Watermark` or `StreamStatus` can be a performance bottleneck, except of some super skewed/weird use cases, so I don't think that both complicating the code and possibly worsening performance in other cases is worth it. So I would stick with optimizing just the `BroadcastRecordWriter`.
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