apache / apache/beam

Byte-based GroupByKey in Flink Streaming

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flink improvement P3 runners
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Description

Currently Flink Streaming GBK is implemented using `SystemReduceFn#buffering`, that works on de-serialized values (we need to de-serialize value after shuffle and then serialize again when appending to bag state).

We can remove this unnecessary serde cycle by using binary representation instead of de-serialized payload.

Imported from Jira [BEAM-11443](https://issues.apache.org/jira/browse/BEAM-11443). Original Jira may contain additional context.
Reported by: dmvk.

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