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https://issues.apache.org/jira/browse/GIRAPH-78?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13150673#comment-13150673
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Avery Ching commented on GIRAPH-78:
-----------------------------------
+1, this would be a great memory optimization.
> 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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