Avery Ching commented on GIRAPH-78:

Actually the more I think about it, this might not be too useful unless you 
have large vertexId objects.  I guess the idea would be to keep a cache, maybe 
in the GraphState or the WorkerContext.
> Be smarter about multiple instances of the same vertex
> ------------------------------------------------------
>                 Key: GIRAPH-78
>                 URL: https://issues.apache.org/jira/browse/GIRAPH-78
>             Project: Giraph
>          Issue Type: Improvement
>            Reporter: Jakob Homan
> In a graph such as 
> {noformat}a -> b, z
> b -> c, z
> c -> a, z
> ...
> z{noformat}
> where vertices a,b,c and are hosted on one worker and z is hosted on another, 
> it would be good to cache instances of z so a,b,c all point at the same 
> instance, rather than generating multiple copies of the same remote vertex 
> during vertex reading.  This is less important with primitive types and the 
> recent work done there, but very useful for more complex types.  Since the 
> vertex readers are in userland, it would be good to provide these facilities 
> as a library implementing users can access. ]

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