[GitHub] [beam] kennknowles opened a new issue, #18212: Consider a hint ParDo.withHighFanout()

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kennknowles opened a new issue, #18212:
URL: https://github.com/apache/beam/issues/18212

   I'm finding myself again and again suggesting users on StackOverflow to insert fusion breaks after high-fanout ParDo's.
   
   I think we should just implement this as a hint on ParDo and MapElements transforms, like we have on GroupByKey.fewKeys() or Combine.withHotKeyFanout().
   
   E.g.: c.apply(ParDo.of(some high-fanout DoFn).withHighFanout()), and a runner that implements fusion could decide to insert a runner-specific fusion break. This somewhat sidesteps the issues in https://issues.apache.org/jira/browse/BEAM-730 and https://lists.apache.org/thread.html/ac34c9ac665a8d9f67b0254015e44c59ea65ecc1360d4014b95d3b2e@%3Cdev.beam.apache.org%3E because every runner can decide how to do the right thing, or is free to ignore the hint.
   
   Imported from Jira [BEAM-1234](https://issues.apache.org/jira/browse/BEAM-1234). Original Jira may contain additional context.
   Reported by: jkff.


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