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https://issues.apache.org/jira/browse/GIRAPH-238?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13408114#comment-13408114
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Alessandro Presta commented on GIRAPH-238:
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Just to be clear: implementors can still override those two methods, for 
example if their vertices have no edge values, or if the edge list is implicit.
These provide a standard implementation that should suffice for most use cases.
We can probably start removing the overrides from some of the derived classes, 
either here or in a later patch.
                
> BasicVertex should have default Writable implementation
> -------------------------------------------------------
>
>                 Key: GIRAPH-238
>                 URL: https://issues.apache.org/jira/browse/GIRAPH-238
>             Project: Giraph
>          Issue Type: Improvement
>          Components: graph
>            Reporter: Alessandro Presta
>            Assignee: Alessandro Presta
>         Attachments: GIRAPH-238.patch
>
>
> It's good to give the option to optimize serialization, but nothing prevents 
> us from having default readFields()/write() methods in BasicVertex.

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