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From Isuru Haththotuwa <isu...@apache.org>
Subject Re: Executing cluster monitor periodically as well as on demand
Date Sun, 14 Dec 2014 09:33:44 GMT
+1. A read write locking model can be used (similar to the one we have in
Topology and Applications) at the cluster monitor level.

On Sun, Dec 14, 2014 at 7:19 AM, Nirmal Fernando <nirmal070125@gmail.com>
wrote:
>
> +1 Reka. I hope this won't be a global level lock rather a cluster level
> lock.
>
> On Sun, Dec 14, 2014 at 10:07 AM, Reka Thirunavukkarasu <reka@wso2.com>
> wrote:
>
>> Hi All,
>>
>> As we now support adding cluster instances dynamically, we will have to
>> wait for next one minute to get the members started in that particular
>> cluster instance which will delay other dependencies startup when it comes
>> to scaling or terminate and start again. Also, after adding the members in
>> obsolete member list when terminating a cluster, we will again have to wait
>> for one minute to get the members terminated. This will delay the action
>> based on the termination specially when it comes to terminate-dependent or
>> terminate-all scenarios.
>>
>> Can we do $subject by introducing locking support for the cluster
>> monitor? So that whenever needed, we can directly execute the cluster
>> monitor by taking lock to take decision only for min check and obsolete
>> check. Let Cluster monitor periodically execute to take decision like min
>> check, obsolete check and scaling. Because, AFAIK for scaling we will have
>> to wait minimum one minute to get all the latest stats.
>>
>> Thanks,
>> Reka
>>
>> --
>> Reka Thirunavukkarasu
>> Senior Software Engineer,
>> WSO2, Inc.:http://wso2.com,
>> Mobile: +94776442007
>>
>>
>>
>
> --
> Best Regards,
> Nirmal
>
> Nirmal Fernando.
> PPMC Member & Committer of Apache Stratos,
> Senior Software Engineer, WSO2 Inc.
>
> Blog: http://nirmalfdo.blogspot.com/
>
> --
> <http://nirmalfdo.blogspot.com/>
> <http://nirmalfdo.blogspot.com/>
> Thanks and Regards,
>
> Isuru H.
> <http://nirmalfdo.blogspot.com/>
> +94 716 358 048 <http://nirmalfdo.blogspot.com/>* <http://wso2.com/>*
>
>
> * <http://wso2.com/>*
>
>
>

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