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https://issues.apache.org/jira/browse/BEAM-5865?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16729547#comment-16729547
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Jozef Vilcek commented on BEAM-5865:
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I just came across this feature
[https://ci.apache.org/projects/flink/flink-docs-stable/dev/stream/experimental.html]
implemented by https://issues.apache.org/jira/browse/FLINK-8571
This could be used to avoid shuffling for precisely generated keys. There still
would have to be a code generating correct keys by reverse-engineering flink's
`keyBy` logic.
> Auto sharding of streaming sinks in FlinkRunner
> -----------------------------------------------
>
> Key: BEAM-5865
> URL: https://issues.apache.org/jira/browse/BEAM-5865
> Project: Beam
> Issue Type: Improvement
> Components: runner-flink
> Reporter: Maximilian Michels
> Priority: Major
>
> The Flink Runner should do auto-sharding of streaming sinks, similar to
> BEAM-1438. That way, the user doesn't have to set shards manually which
> introduces additional shuffling and might cause skew in the distribution of
> data.
> As per discussion:
> https://lists.apache.org/thread.html/7b92145dd9ae68da1866f1047445479f51d31f103d6407316bb4114c@%3Cuser.beam.apache.org%3E
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