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From "Hemanth Yamijala (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-1231) Distcp is very slow
Date Fri, 27 Nov 2009 04:59:39 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-1231?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12783030#action_12783030
] 

Hemanth Yamijala commented on MAPREDUCE-1231:
---------------------------------------------

+1 for the change.

> 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-v3.patch,
mapred-1231-v3.patch, mapred-1231-y20-v2.patch, mapred-1231-y20-v3.patch, mapred-1231-y20-v4.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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