Alex, hi, 2015-06-18 23:25 GMT+08:00 Alex Rukletsov <a...@mesosphere.com>:
> Zhou, > > I haven't read the *Design* yet, but I don't think it is solving the same >> question between priorities and quota. For example, assume we only have 10G >> memory reservating for framework A totally, then another urgency framework >> is getting nothing. which is statical partition still. While priority can >> pre-empt that. >> > > I'm not sure what is your concern here. If all you have is 10GB and both > your frameworks A and B may need 10GB each at the same time, you definitely > need to add more RAM : ). Mesos uses fair sharing for distributing > resources among frameworks, quota will not be an exception. If all you have > is 10GB and for both A and B you have reserved 10GB, total reserved > resources are 20GB, which means your cluster is under quota. I would say, > if this is happening in production cluster, several devops engineers should > have already been paged : ). > > It's up to allocator implementation to decide what to do in this > situation. An obvious approach is to throttle (i.e. revoke resources) both > frameworks proportionally to their role weights. Quota does not introduce > static partitioning, it rather guarantees, a production framework gets > enough resources regardless of any events happening in the cluster, given > these resources are available. > I am sorry for my poor English firstly. In a nutshell, what I pointed is that it is different between priorities and mesos quota. Here I am confused about the following 2 question: 1. The *quota* will be always reserved for some framework in the cluster? And other frameworks are all forbidden to use it? 2. I am figuring out such scenario, as the above Brian said, I have 2 framework: Framework A is responsible for Real-time job, high priority but low frequency of use, while framework B is responsible for offline job, always running, greedy for resource, but low priority. Then, A and B are using the same mesos cluster, how can I config to let B use all of the resource till A pre-empt some of that? thanks a lot. weitao Zhou
