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https://issues.apache.org/jira/browse/MAPREDUCE-1231?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12781312#action_12781312
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Jothi Padmanabhan commented on MAPREDUCE-1231:
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Need to add that this is relevant only with the {{-update}} option
> Distcp is very slow
> -------------------
>
> Key: MAPREDUCE-1231
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-1231
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: distcp
> Affects Versions: 0.20.1
> Reporter: Jothi Padmanabhan
> Assignee: Jothi Padmanabhan
> Fix For: 0.20.2
>
>
> Currently distcp does a checksums check in addition to file length check to
> decide if a remote file has to be copied. If the number of files is high
> (thousands), this checksum check is proving to be fairly costly leading to a
> long time before the copy is started.
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