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Posted to dev@hama.apache.org by 周 <zh...@gmail.com> on 2011/08/16 03:41:11 UTC
Questions from Hama Developer
Dear Hama Team,
I am eager to use Hama to compute the inversion of a large dense
matrix. However, hama programming is not so easy for it is hard to acquire
detailed usage of BSP. Although some example java code is provided,
explanation of the API classes and objects is vague. For instance, I noticed
that all classes has overwritten the function setConf(), but what should we
do in the implementation of this function?
So, I wondered are there any developing documents or detailed
instructions of developing BSP programs to help me?
Yours sincerely,
Chong Zhou
Re: Questions from Hama Developer
Posted by Thomas Jungblut <th...@googlemail.com>.
Hey,
that is great :D
setConf() get's called before BSP. So it is a kind of setup() method that
let you initialize something before computation.
BSP is inherited from Configurable and we don't provide an implementation
down the inheritance tree, so you have to override this.
Good luck!
2011/8/16 周翀 <zh...@gmail.com>
> Dear Hama Team,
> I am eager to use Hama to compute the inversion of a large dense
> matrix. However, hama programming is not so easy for it is hard to acquire
> detailed usage of BSP. Although some example java code is provided,
> explanation of the API classes and objects is vague. For instance, I
> noticed
> that all classes has overwritten the function setConf(), but what should we
> do in the implementation of this function?
>
> So, I wondered are there any developing documents or detailed
> instructions of developing BSP programs to help me?
>
> Yours sincerely,
> Chong Zhou
>
--
Thomas Jungblut
Berlin
mobile: 0170-3081070
business: thomas.jungblut@testberichte.de
private: thomas.jungblut@gmail.com
Re: Questions from Hama Developer
Posted by "Edward J. Yoon" <ed...@apache.org>.
Could you please attach your error logs?
The error log files are located in "{$HAMA_HOME}/logs" folder.
On Thu, Aug 18, 2011 at 2:57 PM, 周翀 <zh...@gmail.com> wrote:
> Hi again, recently I want to set up a small scale distributed system in our
> lab consisting of three nodes and one of them run as master.
> The cluster is correct for running hadoop MapReduce jobs.
> But when I upload the hama directory to each node and run it through PuTTy,
> it fail to run the hama example program and always stuck at supersteps 0. I
> guess maybe there are something wrong with the HDFS configuration.
>
> The configuration files on each node is the copy of the attachment file.
>
> Please take a look at it. Thanks a lot.
>
--
Best Regards, Edward J. Yoon
@eddieyoon
Re: Questions from Hama Developer
Posted by "Edward J. Yoon" <ed...@apache.org>.
> By the way, are there any APIs of HAMA BSP for parallel matrix operation, especially matrix multiplication?
No, you have to implement your own mat-mat mult program using BSP.
This paper will be helpful for you:
Basic Techniques for Numerical Linear Algebra on Bulk Synchronous
Parallel, http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.39.8624&rep=rep1&type=ps
2011/8/16 周翀 <zh...@gmail.com>
>
> Thank you for answering me this soon.
> By the way, are there any APIs of HAMA BSP for parallel matrix operation, especially matrix multiplication?
>
>
> 2011/8/16 Edward J. Yoon <ed...@apache.org>
>>
>> Hi,
>>
>> http://incubator.apache.org/hama/docs/r0.2.0/ApacheHama-0.2_UserGuide.pdf
>>
>> This document will help you learn how to implement a BSP application.
>> If you have some problem, Pls feel free to ask any questions here.
>>
>> Thanks :-)
>>
>> On Tue, Aug 16, 2011 at 10:41 AM, 周翀 <zh...@gmail.com> wrote:
>> > Dear Hama Team,
>> > I am eager to use Hama to compute the inversion of a large dense
>> > matrix. However, hama programming is not so easy for it is hard to acquire
>> > detailed usage of BSP. Although some example java code is provided,
>> > explanation of the API classes and objects is vague. For instance, I noticed
>> > that all classes has overwritten the function setConf(), but what should we
>> > do in the implementation of this function?
>> >
>> > So, I wondered are there any developing documents or detailed
>> > instructions of developing BSP programs to help me?
>> >
>> > Yours sincerely,
>> > Chong Zhou
>> >
>>
>>
>>
>> --
>> Best Regards, Edward J. Yoon
>> @eddieyoon
>
--
Best Regards, Edward J. Yoon
@eddieyoon
Re: Questions from Hama Developer
Posted by "Edward J. Yoon" <ed...@apache.org>.
Hi,
http://incubator.apache.org/hama/docs/r0.2.0/ApacheHama-0.2_UserGuide.pdf
This document will help you learn how to implement a BSP application.
If you have some problem, Pls feel free to ask any questions here.
Thanks :-)
On Tue, Aug 16, 2011 at 10:41 AM, 周翀 <zh...@gmail.com> wrote:
> Dear Hama Team,
> I am eager to use Hama to compute the inversion of a large dense
> matrix. However, hama programming is not so easy for it is hard to acquire
> detailed usage of BSP. Although some example java code is provided,
> explanation of the API classes and objects is vague. For instance, I noticed
> that all classes has overwritten the function setConf(), but what should we
> do in the implementation of this function?
>
> So, I wondered are there any developing documents or detailed
> instructions of developing BSP programs to help me?
>
> Yours sincerely,
> Chong Zhou
>
--
Best Regards, Edward J. Yoon
@eddieyoon