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From: Tommaso Teofili <tommaso.teofili@gmail.com>
Date: Fri, 17 Jan 2014 12:58:32 +0100
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Subject: Re: loading vertices into RAM
To: user@hama.apache.org, Ammar Sahib <ammar.sahib@yahoo.com>
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you're passing the fully qualified name of the Class as a String to a
method setClass(String, Class) while you should pass the Class itself, e.g.:
HamaConfiguration conf = new HamaConfiguration();
conf.setClass("hama.graph.vertices.info",org.apache.
hama.graph.ListVerticesInfo.class);

Hope this helps,
Tommaso


2014/1/17 Ammar Sahib <ammar.sahib@yahoo.com>

> Hi
>
> I am trying to evaluate the different implementation below:
>
>
> - ListVerticesinfo: loads vertices into array list.
> - MapVerticesinfo: loads vertices into tree map.
> - DiskVerticesInfo: loads vertices into a local file.
>
> When using the conf.setClass method I got an error. Below is sample of my
> code:
> HamaConfiguration conf = new HamaConfiguration();
> conf.setClass("hama.graph.vertices.info
> ","org.apache.hama.graph.ListVerticesInfo");
>
> The error I am getting is:
> The method setClass(String, Class<?>, Class<?>) in the type Configuration
> is not applicable for the arguments (String, String).
>
> However I found that I can use conf.set method.
>
>
> Can someone tell me what is I am doing wrong?
>
>
>
>
>
> On Wednesday, January 15, 2014 8:01 AM, Tommaso Teofili <
> tommaso.teofili@gmail.com> wrote:
>
> and OffHeapVerticesInfo for loading vertices off heap, which is available
> with 0.6.3 as well if I recall correctly.
> Tommaso
>
>
>
> 2014/1/15 Edward J. Yoon <edwardyoon@apache.org>
>
> > There are few implementations.
> >
> >  - ListVerticesinfo: loads vertices into array list.
> >  - MapVerticesinfo: loads vertices into tree map.
> >  - DiskVerticesInfo: loads vertices into a local file.
> >
> > You can choose one of them by setting the "hama.graph.vertices.info"
> > in job configuration.
> >
> >   > conf.setClass("hama.graph.vertices.info",
> > "org.apache.hama.graph.ListVerticesInfo".
> >
> > With the latest 0.6.3 version, you can use only ListVerticesInfo.
> > Please use the TRUNK.
> >
> >
> > On Tue, Jan 14, 2014 at 11:18 PM, Ammar Sahib <ammar.sahib@yahoo.com>
> > wrote:
> > > Hi
> > >
> > > According to the BSP model, the data is processed in the RAM and that
> is
> > the reason why Pregel model is faster than the MapReduce (MapReduce
> > writedown to disk). Can someone explains to me how to be sure that all
> the
> > graph vertices are actually been loaded in RAM?
> > >
> > >
> > > How would HAMA behave if the vertices values are so big such that the
> > available RAM memory is not enough to contains all of the vertices?
> > >
> > > Regards
> >
> >
> >
> > --
> > Best Regards, Edward J. Yoon
> > @eddieyoon
> >
>

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