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From "Alessandro Presta (JIRA)" <j...@apache.org>
Subject [jira] [Created] (GIRAPH-528) Decouple vertex implementation from edge storage
Date Wed, 20 Feb 2013 19:29:12 GMT
Alessandro Presta created GIRAPH-528:
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             Summary: 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


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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