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https://issues.apache.org/jira/browse/HADOOP-2906?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12575154#action_12575154
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Chris Douglas commented on HADOOP-2906:
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A couple suggestions:
* If "num.of.trailing.legs.to.use" exceeds the number of segments in the input
file path string, then this will throw an IllegalArgumentException from Path. A
more helpful message should probably accompany this condition.
* It might be worth calling out in the javadocs that {{generateActualKey}} and
{{generateActualValue}} should be aware of side-effects, since {{write}}
typically doesn't modify its args and the framework will reuse them. The code
is clear enough that users can educate themselves, but this is deserving of a
footnote.
Otherwise, +1
> output format classes that can write to different files depending on keys
> and/or config variable
> -------------------------------------------------------------------------------------------------
>
> Key: HADOOP-2906
> URL: https://issues.apache.org/jira/browse/HADOOP-2906
> Project: Hadoop Core
> Issue Type: New Feature
> Components: mapred
> Reporter: Runping Qi
> Assignee: Runping Qi
> Attachments: patch.2096.5.txt
>
>
> I've a few apps that require to write out data into different
> files/directories depending on keys and/or configuration variables.
> I've implemented such classes for those apps. I noticed that many other users
> have similar need from time to time.
> So I think it may be a good idea to contribute to Hadoop mapred.lib package
> so that other users can benefit from it.
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