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https://issues.apache.org/jira/browse/MAPREDUCE-1231?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Arun C Murthy updated MAPREDUCE-1231:
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Status: Open (was: Patch Available)
Cancelling patch while Nic's comments are addressed.
@Venkatesh - We cannot remove a feature which has already been released in
0.20.0; hence we need to make it optional.
> Distcp is very slow
> -------------------
>
> Key: MAPREDUCE-1231
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-1231
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Components: distcp
> Affects Versions: 0.20.1
> Reporter: Jothi Padmanabhan
> Assignee: Jothi Padmanabhan
> Attachments: mapred-1231-v1.patch, mapred-1231-v2.patch,
> mapred-1231-y20-v2.patch, mapred-1231-y20.patch, mapred-1231.patch
>
>
> 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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