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From "Tom White (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-954) The new interface's Context objects should be interfaces
Date Thu, 17 Sep 2009 14:41:57 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-954?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12756565#action_12756565
] 

Tom White commented on MAPREDUCE-954:
-------------------------------------

Only marginally relevant to this discussion, but I noticed that the (existing) Mapper.Context
object in MapTask is constructed via reflection. I think it's possible to create one directly
like this:

{code}
Mapper mapper = ...
Mapper.Context mapperContext = mapper.new Context(...);
{code}

Same for Reducer.Context.


> The new interface's Context objects should be interfaces
> --------------------------------------------------------
>
>                 Key: MAPREDUCE-954
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-954
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>          Components: client
>            Reporter: Owen O'Malley
>            Assignee: Arun C Murthy
>             Fix For: 0.21.0
>
>         Attachments: MAPREDUCE-954.patch, MAPREDUCE-954.patch, MAPREDUCE-954.patch
>
>
> When I was doing HADOOP-1230, I was persuaded to make the Context objects as classes.
I think that was a serious mistake. It caused a lot of information leakage into the public
classes.

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