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https://issues.apache.org/jira/browse/MAPREDUCE-750?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12731630#action_12731630
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Aaron Kimball commented on MAPREDUCE-750:
-----------------------------------------

I should point out -- I'm all for not cluttering up the mapred-, hdfs- and 
core-* config files with extraneous parameters. Is there a better place to put 
this? Can/should we have a contrib-default and contrib-site? (Or, inevitably, 
per-contrib-module config files?)

> Extensible ConnManager factory API
> ----------------------------------
>
>                 Key: MAPREDUCE-750
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-750
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>          Components: contrib/sqoop
>            Reporter: Aaron Kimball
>            Assignee: Aaron Kimball
>         Attachments: MAPREDUCE-750.patch
>
>
> Sqoop uses the ConnFactory class to instantiate a ConnManager implementation 
> based on the connect string and other arguments supplied by the user. This 
> allows per-database logic to be encapsulated in different ConnManager 
> instances, and dynamically chosen based on which database the user is 
> actually importing from. But adding new ConnManager implementations requires 
> modifying the source of a common ConnFactory class. An indirection layer 
> should be used to delegate instantiation to a number of factory 
> implementations which can be specified in the static configuration or at 
> runtime.

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