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https://issues.apache.org/jira/browse/HADOOP-17882?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17529346#comment-17529346
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Steve Loughran commented on HADOOP-17882:
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this hasn't been done yet.
proposed
* pass in file length from file status
* ask for whole file when that's the algorithm
> distcp to use openFile() with sequential IO; ranges of reads
> ------------------------------------------------------------
>
> Key: HADOOP-17882
> URL: https://issues.apache.org/jira/browse/HADOOP-17882
> Project: Hadoop Common
> Issue Type: Sub-task
> Components: tools/distcp
> Affects Versions: 3.4.0
> Reporter: Steve Loughran
> Priority: Major
>
> once openFile adds standard options for sequential access, distcp to adopt so
> as to enforce sequential reads on all uploads/backups
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