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From Thomas Jungblut <thomas.jungb...@gmail.com>
Subject Re: Graph numberVertices Bug
Date Wed, 05 Sep 2012 06:45:10 GMT
Feel free to provide a patch and fix it ;)

2012/9/5 HuYuesheng <yshoo.project@gmail.com>

> The value of numberVertices will affect the method --"getNumVertices()"
> that used in PageRank example to set the initial value of the vertex. So,
> if the numberVertices is diffrent in every task, the result of PageRank
> will be not accurate.
>
> I have tried to fix this, send the vertices.size() to other peers, then sum
> up the messge get a global numberVertices.
> It worked in local mode.
>
> 2012/9/5 Thomas Jungblut <thomas.jungblut@gmail.com>
>
> > Yep, this thing is called "Aggregator", pagerank makes use of it for
> > example.
> >
> > 2012/9/5 Edward J. Yoon <edwardyoon@apache.org>
> >
> > > > not all task been assigned the same number of vertices.
> > >
> > > Yes, you're right. So, that's the estimated number of vertices. If
> > > each tasks sends the number of vertices to the 'master task', the
> > > 'master task' might be used to sum up counts.
> > >
> > > On Wed, Sep 5, 2012 at 12:18 PM, HuYuesheng <yshoo.project@gmail.com>
> > > wrote:
> > > > Hi guys,
> > > >
> > > >      I think I found a bug in
> > > > org.apache.hama.graph.GraphJobRunner.setup(). numberVertices
> > > > = vertices.size() * peer.getNumPeers(),  this line is not correct
> > because
> > > > not all task been assigned the same number of vertices.
> > > >      Am I right?
> > >
> > >
> > >
> > > --
> > > Best Regards, Edward J. Yoon
> > > @eddieyoon
> > >
> >
>

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