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https://issues.apache.org/jira/browse/GIRAPH-204?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13403308#comment-13403308
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Eli Reisman commented on GIRAPH-204:
------------------------------------

I like this idea a lot. Strongly typed IO would still be available for 
experienced users, we need more explicitly-named IO formats and other things in 
this codebase to just get new users up and running with very shallow learning 
curve. End users should think about algorithms only, all other headaches should 
be under the hood whenever possible.

                
> Writables don't promote and that's quite suboptimal
> ---------------------------------------------------
>
>                 Key: GIRAPH-204
>                 URL: https://issues.apache.org/jira/browse/GIRAPH-204
>             Project: Giraph
>          Issue Type: Improvement
>            Reporter: Jakob Homan
>
> Right now all our in/outputformats have to be exactly type conformant.  This 
> means that spitting an IntWritable to an OutputFormat causes a 
> runtimeexception.  We either need to make sure the formats are 
> lowest-common-denominator, or are able to correctly handle reasonable type 
> sloppiness.

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