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http://issues.apache.org/jira/browse/HADOOP-51?page=comments#action_12373803 ]
Doug Cutting commented on HADOOP-51:
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> the idiom of conf.getType("config.value",defaultValue) is good for
> user-defined values, but shouldn't the default be skipped for things that are
> defined in hadoop-default.xml, in general?
The value from hadoop-default.xml is used in preference to the defaultValue
paramter. The paramter is only used as a last resort when no value is found in
hadoop-default.xml or any other config file.
> 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
> Attachments: Replication.patch
>
> 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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