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https://issues.apache.org/jira/browse/GIRAPH-11?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13150213#comment-13150213
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Avery Ching commented on GIRAPH-11:
-----------------------------------

No problem.  I can make vertexRangeMap protected instead of private.  
                
> Improve the graph distribution of Giraph
> ----------------------------------------
>
>                 Key: GIRAPH-11
>                 URL: https://issues.apache.org/jira/browse/GIRAPH-11
>             Project: Giraph
>          Issue Type: Improvement
>    Affects Versions: 0.70.0
>            Reporter: Avery Ching
>            Assignee: Avery Ching
>         Attachments: GIRAPH-11.2.diff, GIRAPH-11.3.diff, GIRAPH-11.4.diff, 
> GIRAPH-11.diff
>
>
> Currently, Giraph assumes that the data from the VertexInputFormat is sorted. 
>  If the user data is not sorted by the vertex id, they must first run a 
> MapReduce or Pig job to generate a sorted dataset.  This is often a bit 
> inconvenient.
> Giraph graph partitioning is currently range based and there are some 
> advantages and disadvantages of this approach.  The proposal of this JIRA 
> would be to allow for both range and hash based partitioning and provide more 
> flexibility to the user.
> Design goals for the graph distribution:
> * Allow vertices to be unordered or unordered
> * Ability to repartition
> * Select the partitioning scheme based on user needs (i.e. hash or range 
> based)
> * Ability to provide user-specific hints about partitions
> Hash-based partitioning
> * Good vertex balancing across ranges for random data
> * Bad at vertex id locality
> Range-based partitioning
> * Good at vertex id locality
> * Ability to split ranges easily
> * Can cause hotspots for hot ranges

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