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From Chia-Hung Lin <cli...@googlemail.com>
Subject Re: Does fault tolerance work in Hama 0.6.0
Date Thu, 18 Jul 2013 15:25:50 GMT
Not very sure the current status. But given a quick check that it
looks like still no metrics information exported, and lower level
detection is remained as usual. I am afraid that there might have side
effects.



On 18 July 2013 08:48, Edward J. Yoon <edwardyoon@apache.org> wrote:
> Hi,
>
> 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
> @eddieyoon

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