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https://issues.apache.org/jira/browse/HADOOP-15292?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16391856#comment-16391856
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Virajith Jalaparti commented on HADOOP-15292:
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[[email protected]], Thanks for reviewing and committing it. [~elgoiri] and
[~chris.douglas], thanks for the reviews.
> Distcp's use of pread is slowing it down.
> -----------------------------------------
>
> Key: HADOOP-15292
> URL: https://issues.apache.org/jira/browse/HADOOP-15292
> Project: Hadoop Common
> Issue Type: Bug
> Components: tools/distcp
> Affects Versions: 2.5.0
> Reporter: Virajith Jalaparti
> Assignee: Virajith Jalaparti
> Priority: Minor
> Fix For: 3.1.0
>
> Attachments: HADOOP-15292.000.patch, HADOOP-15292.001.patch,
> HADOOP-15292.002.patch
>
>
> Distcp currently uses positioned-reads (in
> RetriableFileCopyCommand#copyBytes) when the source offset is > 0. This
> results in unnecessary overheads (new BlockReader being created on the
> client-side, multiple readBlock() calls to the Datanodes, each of which
> requires the creation of a BlockSender and an inputstream to the ReplicaInfo).
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