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From Han JU <ju.han.fe...@gmail.com>
Subject Re: What if the resulting graph is larger than the memory?
Date Tue, 21 May 2013 09:52:43 GMT
Hi Maja,

The input graph of my problem is not big, the calculation result is very
big.
In fact what does out-of-core graph mean? Where can I find some examples of
this and for output during computation?

Thanks.



2013/5/17 Maja Kabiljo <majakabiljo@fb.com>

>  Hi JU,
>
>  One thing you can try is to use out-of-core graph
> (giraph.useOutOfCoreGraph option).
>
>  I don't know what your exact use case is – do you have the graph which
> is huge or the data which you calculate in your application is? In the
> second case, there is 'giraph.doOutputDuringComputation' option you might
> want to try out. When that is turned on, during each superstep writeVertex
> will be called immediately after compute for that vertex is called. This
> means that you can store data you want to write in vertex, write it and
> clear the data before going to the next vertex.
>
>  Maja
>
>   From: Han JU <ju.han.felix@gmail.com>
> Reply-To: "user@giraph.apache.org" <user@giraph.apache.org>
> Date: Friday, May 17, 2013 8:38 AM
> To: "user@giraph.apache.org" <user@giraph.apache.org>
> Subject: What if the resulting graph is larger than the memory?
>
>   Hi,
>
>  It's me again.
> After a day's work I've coded a Giraph solution for my problem at hand. I
> gave it a run on a medium dataset and it's notably faster than other
> approaches.
>
>  However the goal is to process larger inputs, for example I've a larger
> dataset that the result graph is about 400GB when represented in edge
> format and in text file. And I think the edges that the algorithm created
> all reside in the cluster's memory. So it means that for this big dataset,
> I need a cluster with ~ 400GB main memory to run? Is there any
> possibilities that I can output "on the go" that means I don't need to
> construct the whole graph, an edge is outputed to HDFS immediately instead
> of being created in main memory then be outputed?
>
>  Thanks!
> --
> *JU Han*
>
>    Software Engineer Intern @ KXEN Inc.
>   UTC   -  Université de Technologie de Compiègne
>    *     **GI06 - Fouille de Données et Décisionnel*
>
>  +33 0619608888
>



-- 
*JU Han*

Software Engineer Intern @ KXEN Inc.
UTC   -  Université de Technologie de Compiègne
*     **GI06 - Fouille de Données et Décisionnel*

+33 0619608888

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