[jira] [Updated] (BEAM-4565) Hot key fanout should not distribute keys to all shards.

["Kenneth Knowles (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/BEAM-4565?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Kenneth Knowles updated BEAM-4565:
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This Jira ticket has a pull request attached to it, but is still open. Did the pull request resolve the issue? If so, could you please mark it resolved? This will help the project have a clear view of its open issues.

> Hot key fanout should not distribute keys to all shards.
> --------------------------------------------------------
>
>                 Key: BEAM-4565
>                 URL: https://issues.apache.org/jira/browse/BEAM-4565
>             Project: Beam
>          Issue Type: Task
>          Components: sdk-java-core, sdk-py-core
>    Affects Versions: 2.0.0, 2.1.0, 2.2.0, 2.3.0, 2.4.0, 2.5.0
>            Reporter: Robert Bradshaw
>            Priority: P3
>              Labels: Clarified
>          Time Spent: 1h
>  Remaining Estimate: 0h
>
> 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. 



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