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From Paolo Castagna <>
Subject Re: SimplePageRankVertex implementation, dangling nodes and sending messages to all nodes...
Date Tue, 29 May 2012 11:13:28 GMT
Hi Sebastian

Sebastian Schelter wrote:
> Why do you only recompute the pageRank in each second superstep? Can we
> not use the aggregated value of the dangling nodes from the last superstep?

I removed the computing of PageRank values every each second superstep.
However, I needed to use a couple of aggregators for the dangling nodes
contribution instead of just one: "dangling-current" and "dangling-previous".

Each superstep, I need to reset the dangling-current aggregator, at the
same time, I need to know the value of the aggregator at a previous

I hope it makes sense, let me know if you have a better idea.

> Overall I think we're on a good way to a robust, real-world PageRank
> implementation, I managed to implement the convergence check with an
> aggregator, will post an updated patch soon.

I think I've just done it, have a look [1] and let me know if you would have
done it differently.



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