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From Flavian Jacquot <>
Subject Re: very important question about partitioning and final combination
Date Fri, 06 Feb 2015 18:30:03 GMT
Hi, I'm not an expert but I may have answers to your questions.
For 1) A vertex belong to only 1 partition see
For 2) You could use a master computation and an aggregator which count the
number of active vertex, when it drop to 0 you can execute what you want
then call haltComputation() in the master.

Good evening,

2015-02-06 16:59 GMT+01:00 Carmen Manzulli <>:

> Hi experts,
> i've just two conceptual questions about giraph:
> 1) because of giraph works on hadoop, if i have more informations about a
> vertex in different partitions and also in different machines, for example,
> for a social graph or a person graph, about "Alan" (source id) who is (edge
> value) 24 years old (target id) and, on another machine, there is a
> partition with "Alan"(source id) who lives(edge value) in Italy(target id),
> and so on: how giraph will  consider these relations if i ask for all
> people who live in Italy and are 24 years old ?
> 2) if giraph doesn't consider relations between same vertex in different
> partitions and machines when it runs compute() methos, is it possible to
> write a  function and make it executable after all iterations by giraph, so
> when all vertices are inactive?
> thanks and regards,
> Carmen.

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