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https://issues.apache.org/jira/browse/GIRAPH-28?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13103372#comment-13103372
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Jake Mannix commented on GIRAPH-28:
-----------------------------------

ah, yes.  That can be a nasty pit of snakes for new developers, no matter how 
commonly it's found in Hadoop-land.

So I'll put in my vote for Iterable<I>, with your offline suggestion of boolean 
hasSortedIterator() (defaulting in BasicVertex to "return true;", overrideable 
in subclasses).

And I'll put in a patch on GIRAPH-31 so my code'll be where my mouth is (and we 
can continue this discussion on a ticket with a shorter thread [so far]).

> Introduce new primitive-specific MutableVertex subclasses
> ---------------------------------------------------------
>
>                 Key: GIRAPH-28
>                 URL: https://issues.apache.org/jira/browse/GIRAPH-28
>             Project: Giraph
>          Issue Type: New Feature
>          Components: graph
>    Affects Versions: 0.70.0
>            Reporter: Jake Mannix
>            Assignee: Jake Mannix
>         Attachments: GIRAPH-28.diff, GIRAPH-28.diff
>
>
> As discussed on the list, 
> MutableVertex<LongWritable,DoubleWritable,FloatWritable,DoubleWritable> (for 
> example) could be highly optimized in its memory footprint if the vertex and 
> edge data were held in a form which minimized Java object usage.

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