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https://issues.apache.org/jira/browse/BEAM-9877?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kyle Weaver resolved BEAM-9877.
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Fix Version/s: 2.21.0
Resolution: Fixed
> 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
> Fix For: 2.21.0
>
> Time Spent: 1h
> Remaining Estimate: 0h
>
> 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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