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https://issues.apache.org/jira/browse/GIRAPH-528?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13587436#comment-13587436
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Claudio Martella commented on GIRAPH-528:
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heheh, i meant it IS tricky... ;)
> Decouple vertex implementation from edge storage
> ------------------------------------------------
>
> Key: GIRAPH-528
> URL: https://issues.apache.org/jira/browse/GIRAPH-528
> Project: Giraph
> Issue Type: Improvement
> Reporter: Alessandro Presta
> Assignee: Alessandro Presta
>
> This is meant to address the following issues:
> 1) The Vertex hierarchy is too complex and sometimes hard to work with
> (Vertex, SimpleVertex, MutableVertex, SimpleMutableVertex...).
> 2) Changing the underlying edge storage implementation for an existing
> algorithm requires editing your vertex to extend a different one.
> 3) In the general case (e.g. when not using ByteArrayVertex with the current
> EdgeStore), moving edges from the EdgeStore to the vertices is an additional
> step that can be avoided.
> My proposal is the following:
> - Make EdgeStore an interface. An implementation should deal with
> (concurrent) insertion of edges during input superstep; iteration over a
> vertex's edges during computation; insertion/deletion of edges during
> mutations (optional?); checkpointing.
> - The default EdgeStore will be the current byte-array implementation, which
> is generic (works with any choice of <I, V, E, M>) and reasonably optimized.
> - Only one Vertex class, which the user extends for the sole purpose of
> defining compute(). I don't necessarily agree that it should be an interface,
> because we still want to provide methods like getEdges(), sendMessage(), and
> those should delegate to the EdgeStore/MessageStore of choice.
> - Switching edge storage implementation is done by passing the EdgeStore
> class as an option. One can also define his own ad-hoc EdgeStore (e.g.,
> backed by primitive arrays).
> I think we should also extend this idea to MessageStore, making it possible
> to override that functionality too.
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