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https://issues.apache.org/jira/browse/BEAM-9877?focusedWorklogId=430371&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-430371
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ASF GitHub Bot logged work on BEAM-9877:
----------------------------------------
Author: ASF GitHub Bot
Created on: 04/May/20 19:30
Start Date: 04/May/20 19:30
Worklog Time Spent: 10m
Work Description: ibzib opened a new pull request #11601:
URL: https://github.com/apache/beam/pull/11601
…entByteSizeObservableIterable so that size estimation is lazy
Cherry-pick of #11598. (I removed the commit history because I forgot to
squash before merging the original PR, and one atomic commit is a lot easier to
deal with.) R: @tudorm
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Issue Time Tracking
-------------------
Worklog Id: (was: 430371)
Time Spent: 0.5h (was: 20m)
> 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
> Time Spent: 0.5h
> 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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