On Sat, Nov 8, 2014 at 9:06 PM, Reka Thirunavukkarasu <r...@wso2.com> wrote:
> Hi > > On Sat, Nov 8, 2014 at 7:57 PM, Lahiru Sandaruwan <lahi...@wso2.com> > wrote: > >> Hi all, >> >> I'm working on $subject. When we predict the instance count from >> statistics and dependency based ratio in application, we will get numbers >> with fraction. E.g. 1.2, 3.9, 4.5. Therefore we have to round the instance >> count for creating instances in IaaS. >> >> >> I have thought of three types to choose from. >> >> >> 1. Floor >> 2. Ceiling >> 3. Custom percentage >> >> #3 means, user can give a limit of fraction to decide whether to round to >> floor or ceiling. >> >> e.g. User fives fraction as 0.2, >> >> Instance count 3.1 Rounded value 3 >> Instance count 3.21: Rounded value 4 >> Instance count 1.19: Rounded value 1 >> >> Feel free to give feedback. >> > > +1 to use #3 as it covers all the scenarios. But how are we going to > handle the ratio between dependent cartridges? For e.g.: > > If C1:C2 = 2:3 where C1 and C2 are dependent clusters, then we got the > instance count to be scaled up for C1 as 1.19 by the statistics of C1 which > will scale C1 by 1. Then the relative instance count to be scaled for C2 > can be either decided by (1/2)*3 or against with the existing count of C1 > and C2. Are we going to use the same fraction to keep the ratio as well, > since even the ratio calculation won't be round figures all the time? > > I think we should keep same fraction for dependency ratio as well. We can keep value we get as required instance count as a fraction itself per cluster. If we get a higher value from stats or dependency ratio, we will replace this value always. wdyt? Thanks. Thanks, Reka > > Thanks. > > > > > -- > -- > Lahiru Sandaruwan > Committer and PMC member, Apache Stratos, > Senior Software Engineer, > WSO2 Inc., http://wso2.com > lean.enterprise.middleware > > email: lahi...@wso2.com blog: http://lahiruwrites.blogspot.com/ > linked-in: http://lk.linkedin.com/pub/lahiru-sandaruwan/16/153/146 > > -- Reka Thirunavukkarasu Senior Software Engineer, WSO2, Inc.:http://wso2.com, Mobile: +94776442007 -- -- Lahiru Sandaruwan Committer and PMC member, Apache Stratos, Senior Software Engineer, WSO2 Inc., http://wso2.com lean.enterprise.middleware email: lahi...@wso2.com blog: http://lahiruwrites.blogspot.com/ linked-in: http://lk.linkedin.com/pub/lahiru-sandaruwan/16/153/146
