[jira] Commented: (HADOOP-2122) Document config parameters for each Map-Reduce class/interface

["Owen O'Malley (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HADOOP-2122?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12538679 ] 

Owen O'Malley commented on HADOOP-2122:
---------------------------------------

I'd suggest figuring out if we could use attributes like @ConfiguredBy(...) to generate the table for javadoc.

> Document config parameters for each Map-Reduce class/interface
> --------------------------------------------------------------
>
>                 Key: HADOOP-2122
>                 URL: https://issues.apache.org/jira/browse/HADOOP-2122
>             Project: Hadoop
>          Issue Type: Improvement
>          Components: documentation
>            Reporter: Arun C Murthy
>
> I propose we add a table in the javadoc for each user-facing Map-Reduce interface/class which lists, and provides details, of each and every config parameter which has any bearing on that interface/class. Clearly some parameters affect more than one place and they should be put in more than one table.
> For e.g. 
> Mapper -> io.sort.mb, io.sort.factor
> Reducer -> fs.inmemory.size.mb
> ...
> etc.
> It would very nice to explain how it interacts with the framework and rest of config params etc.
> Thoughts?

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