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Posted to dev@hama.apache.org by developer wang <de...@gmail.com> on 2013/07/17 10:31:47 UTC
Does fault tolerance work in Hama 0.6.0
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?
Re: Does fault tolerance work in Hama 0.6.0
Posted by Chia-Hung Lin <cl...@googlemail.com>.
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 <ed...@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 <de...@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
Re: Does fault tolerance work in Hama 0.6.0
Posted by "Edward J. Yoon" <ed...@apache.org>.
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 <de...@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