You are viewing a plain text version of this content. The canonical link for it is here.
Posted to mapreduce-issues@hadoop.apache.org by "Jothi Padmanabhan (JIRA)" <ji...@apache.org> on 2009/11/23 10:30:39 UTC
[jira] Updated: (MAPREDUCE-1231) Distcp is very slow
[ 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.
--
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.