[ 
http://issues.apache.org/jira/browse/HADOOP-51?page=comments#action_12373565 ] 

paul sutter commented on HADOOP-51:
-----------------------------------

+1 that

it might be easier to use on a per-directory basis, examples:

- /tmp directory, replication count 2 (or 1!), a good place for the output of 
intermediate reduce steps
- /cached directory, infinite replicaton count, a good place for lookup files 
used in mappers or reducers


> per-file replication counts
> ---------------------------
>
>          Key: HADOOP-51
>          URL: http://issues.apache.org/jira/browse/HADOOP-51
>      Project: Hadoop
>         Type: New Feature

>   Components: dfs
>     Versions: 0.2
>     Reporter: Doug Cutting
>     Assignee: Konstantin Shvachko
>      Fix For: 0.2

>
> It should be possible to specify different replication counts for different 
> files.  Perhaps an option when creating a new file should be the desired 
> replication count.  MapReduce should take advantage of this feature so that 
> job.xml and job.jar files, which are frequently accessed by lots of machines, 
> are more highly replicated than large data files.

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