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From Eli Reisman <>
Subject Re: InputFormat for the example SimpleMasterComputeVertex
Date Thu, 14 Feb 2013 22:23:29 GMT
Other folks on the list are also having this problem with the progressable
utile exception & job failures. I don't know much about master compute
usage but if it is needed to make the aggregators work, maybe we should
have a default dummy class that just handles aggregators if no other master
compute is specified? Or a wiki page? The progressable error message does
not lead us to this conclusion directly.

On Wed, Feb 13, 2013 at 3:04 AM, Maria Stylianou <> wrote:

> Hey,
> I am trying to run the example SimpleMasterComputeVertex, but no matter
> which Input Format and graph I give, it doesn't work. Each worker gives the
> error:
> Caused by: java.lang.*NullPointerException*
> 	at org.apache.giraph.examples.*SimpleMasterComputeVertex.compute*(*42*)
> This line 42 is the first line of the compute()
> public void compute(Iterable<DoubleWritable> messages){
> So I guess, the initialization is not done correctly, because the input
> file does not have the correct format.
> Any help would be appreciated,
> Thanks!
> Maria
> --
> Maria Stylianou
> Intern at Telefonica, Barcelona, Spain
> Master Student of European Master in Distributed Computing<>
> Universitat Polit├Ęcnica de Catalunya - BarcelonaTech, Barcelona, Spain
> KTH Royal Institute of Technology, Stockholm, Sweden

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