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From "Claudio Martella (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (GIRAPH-78) Be smarter about multiple instances of the same vertex
Date Thu, 17 Nov 2011 02:57:51 GMT

    [ https://issues.apache.org/jira/browse/GIRAPH-78?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13151753#comment-13151753
] 

Claudio Martella commented on GIRAPH-78:
----------------------------------------

Yes, very nice, but how would you implement this? A caching Factory or you really want 100%
re-use? That would require a per-worker index of Is.
                
> 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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