We are pleased to announce a new algorithm to base your application / website scaling on, scaling based on URL response time.
If response time is critical to you, you can now set this parameter and Scalr will add more nodes when response time on a URL increases above a threshold, or remove nodes when the response time decreases below another.
To access this algorithm, simply edit the Farm from the options menu, select the Role for which to change the scaling algorithm, click the scaling tab, and select ‘Enable scaling based on HTTP URL Response time’. Then add your parameters and url.
Cheers,
Sebastian
Is a good addition, it will be great too if the units are specified (milliseconds, seconds, …)
Lets pretend response time is set to 1 second. We release a new version of our site that raises the response time to 1.2 seconds due to a above. It could run on a super computer and the response time would still be 1.2 seconds.
Would scalr then start create an unlimited number of instances?
Yes, it would. However the instances would be created at fixed intervals, that you set. If you set the step to 10 minutes, it will launch a new instance every 10 minutes, then evaluate how response time has changed as a result. If the response time still does not lower, it simply creates another one 10 minutes later.