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https://issues.apache.org/jira/browse/BEAM-14545?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17550102#comment-17550102
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Danny McCormick commented on BEAM-14545:
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This issue has been migrated to https://github.com/apache/beam/issues/21664

> Optimize copies in dataflow v1 shuffle reader
> ---------------------------------------------
>
>                 Key: BEAM-14545
>                 URL: https://issues.apache.org/jira/browse/BEAM-14545
>             Project: Beam
>          Issue Type: Improvement
>          Components: runner-dataflow
>            Reporter: Steve Niemitz
>            Assignee: Steve Niemitz
>            Priority: P2
>          Time Spent: 0.5h
>  Remaining Estimate: 0h
>
> The dataflow v1 shuffle reader unnecessarily copies the byte[] read from 
> shuffle, we could use something like ByteString to instead "slice" the buffer 
> into pieces and avoid a few copies.



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