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Date: Mon, 23 Nov 2009 09:30:39 +0000 (UTC)
From: "Jothi Padmanabhan (JIRA)" <jira@apache.org>
To: mapreduce-issues@hadoop.apache.org
Subject: [jira] Updated: (MAPREDUCE-1231) Distcp is very slow
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     [ https://issues.apache.org/jira/browse/MAPREDUCE-1231?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jothi Padmanabhan updated MAPREDUCE-1231:
-----------------------------------------

    Attachment: mapred-1231.patch

Patch that disables checksum validations.

The long term solution would be to do the setup, including checksum validations, as a separate M/R Job. This possibly could be done in a separate Jira. 

> 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
>
>         Attachments: 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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