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https://issues.apache.org/jira/browse/BEAM-11719?focusedWorklogId=591677&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-591677
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ASF GitHub Bot logged work on BEAM-11719:
-----------------------------------------

                Author: ASF GitHub Bot
            Created on: 30/Apr/21 18:05
            Start Date: 30/Apr/21 18:05
    Worklog Time Spent: 10m 
      Work Description: udim commented on pull request #14680:
URL: https://github.com/apache/beam/pull/14680#issuecomment-830268211


   cc @katsiapis


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Issue Time Tracking
-------------------

    Worklog Id:     (was: 591677)
    Time Spent: 12h  (was: 11h 50m)

> Enforce deterministic coding for GroupByKey and Stateful DoFns
> --------------------------------------------------------------
>
>                 Key: BEAM-11719
>                 URL: https://issues.apache.org/jira/browse/BEAM-11719
>             Project: Beam
>          Issue Type: Bug
>          Components: sdk-py-core
>            Reporter: Robert Bradshaw
>            Assignee: Robert Bradshaw
>            Priority: P1
>             Fix For: 2.29.0
>
>          Time Spent: 12h
>  Remaining Estimate: 0h
>
> If a non-deterministic coder, such as pickling, is used for keys this can 
> result in two copies of the same key being grouped separately (based on their 
> encodings). 



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