Hi Qian Zhang I can answer the fourth question.
if a framework has not responded to an offer for a sufficiently long time, Mesos rescinds the offer and re-offers the resources to other frameworks. You cant get it I am not clear in how Mesos divide all resources into multiple subsets? ---------------------------------------- 陈宗志 Blog: baotiao.github.io > On Jun 11, 2015, at 08:35, Qian Zhang <[email protected]> wrote: > > Thanks Alex. > > For 1. I understand currently the only choice is C++. However, as Adam > mentioned, true pluggable allocator modules (MESOS-2160 > <https://issues.apache.org/jira/browse/MESOS-2160>) are landing in Mesos > 0.23, so at that time, I assume we will have more choices, right? > > For 2 and 3, my understanding is Mesos allocator will partition all the > available resources into multiple subsets, and there is no overlap between > these subsets (i.e., a single resource can only be in one subset), and then > offer these subsets to multiple frameworks (e.g., offer subset1 to > framework1, offer subset2 to framework2, and so on), and it is up to each > framework's scheduler to determine if it accept the resource to launch task > or reject it. In this way, each framework's scheduler can actually make > scheduling decision independently since they will never compete for the same > resource. > > If my understanding is correct, then I have one more question: > 4. What if it takes very long time (e.g., mins or hours) for a framework's > scheduler to make the scheduling decision? Does that mean during this long > period, the resources offered to this framework will not be used by any other > frameworks? Is there a timeout for the framework's scheduler to make the > scheduling decision? So when the timeout is reached, the resources offered to > it will be revoked by Mesos allocator and can be offered to another framework. >
