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From "Edward J. Yoon" <edwardy...@apache.org>
Subject Re: Does fault tolerance work in Hama 0.6.0
Date Thu, 18 Jul 2013 00:48:48 GMT

Current BSP and Graph API doesn't support FT mode.

See http://svn.apache.org/repos/asf/hama/trunk/examples/src/main/java/org/apache/hama/examples/SuperstepPiEstimator.java

Sorry for lack of documentation. I'll finish the FT and Spilling Queue soon.

On Wed, Jul 17, 2013 at 5:31 PM, developer wang <developer.pw@gmail.com> wrote:
> hi, all
>   I am interested in fault tolerance in Hama.
>   Because of some legacy systems, I still use Hama 0.6.0, and there are a
> lot of code to support fault tolerance in Hama 0.6.0.
>   so I had a try with FT in hama.
>   I enable FT in such a way:
>        pageJob.set("bsp.ft.enabled", "true");
>        pageJob.set("bsp.checkpoint.enabled", "true");
>  is it right?
>  and I searched fault tolerance doc for hama, but only found
> http://wiki.apache.org/hama/GroomServerFaultTolerance?highlight=%28fault%29
>  Are there other material about FT in hama?
> With the two lines of code, I enabled FT in hama. and when the groomservers
> started to compute after loading vertices, I killed one of the working
> groomservers (not master), then all others groomservers hung, but in the
> cluster there is still one idle groomserver.
> Does hama 0.6.0 support FT? or is FT is unfinished feature in hama 0.6.0?
> and how about other versions?

Best Regards, Edward J. Yoon

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