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Posted to issues@beam.apache.org by "Luke Cwik (Jira)" <ji...@apache.org> on 2020/05/04 17:48:00 UTC

[jira] [Assigned] (BEAM-9877) Eager size estimation of large group-by-key iterables cause expensive / duplicate reads

     [ https://issues.apache.org/jira/browse/BEAM-9877?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Luke Cwik reassigned BEAM-9877:
-------------------------------

    Assignee: Tudor Marian

> Eager size estimation of large group-by-key iterables cause expensive / duplicate reads
> ---------------------------------------------------------------------------------------
>
>                 Key: BEAM-9877
>                 URL: https://issues.apache.org/jira/browse/BEAM-9877
>             Project: Beam
>          Issue Type: Bug
>          Components: sdk-java-core
>            Reporter: Tudor Marian
>            Assignee: Tudor Marian
>            Priority: Major
>
> BatchGroupAlsoByWindowViaIteratorsFn WindowReiterator can cause very expensive duplicate reading of data from a (Co-)GroupByKey for hot keys with many values due to PCollection size estimation.  Instead, it should perform lazy estimation like GroupingShuffleReader and GroupingShuffleEntryInterator (or perform no estimation at all).



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