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Posted to github@beam.apache.org by GitBox <gi...@apache.org> on 2022/06/03 22:10:10 UTC

[GitHub] [beam] kennknowles opened a new issue, #19089: Hot key fanout should not distribute keys to all shards.

kennknowles opened a new issue, #19089:
URL: https://github.com/apache/beam/issues/19089

   The goal is to reduce the number of value sent to a single post-GBK worker. If combiner lifting happens, each bundle will sends a single value per sub-key, causing an N-fold blowup in shuffle data and N reducers with the same amount of data to consume as the single reducer in the non-fanout case. 
   
   Imported from Jira [BEAM-4565](https://issues.apache.org/jira/browse/BEAM-4565). Original Jira may contain additional context.
   Reported by: robertwb.


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