[ http://issues.apache.org/jira/browse/HADOOP-561?page=all ]
dhruba borthakur updated HADOOP-561:
------------------------------------
Attachment: localreplica.patch
This fixesd two bugs in chooseTarget() routine that was causing the local
machine to not get picked as a replica
> one replica of a file should be written locally if possible
> -----------------------------------------------------------
>
> Key: HADOOP-561
> URL: http://issues.apache.org/jira/browse/HADOOP-561
> Project: Hadoop
> Issue Type: Bug
> Components: dfs
> Reporter: Yoram Arnon
> Assigned To: dhruba borthakur
> Attachments: localreplica.patch
>
>
> one replica of a file should be written locally if possible. That's currently
> not the case.
> Copying a 1GB file using hadoop dfs -cp running on one of the cluster nodes,
> all the blocks were written to remote nodes, as seen by fsck -files -blocks
> -locations on the newly created file.
> as long as there is sufficient space locally, a local copy has significant
> performance benefits.
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