For *(2)*, sorry. On Mon, Mar 16, 2015 at 12:53 PM, Benjamin Mahler <[email protected] > wrote:
> For (3), actually the answer is yes. The API exposes a mechanism for > schedulers to explicitly request resources. However, it's not implemented > in the allocator as all schedulers have just relied on the master sending > offers periodically, for now. > > On Sat, Mar 14, 2015 at 6:36 AM, Jörg Schad <[email protected]> wrote: > >> Hi, >> I tried to answer your questions inline below: >> Overall I would recommend you to have a look at the following paper >> explaining some of the background of scheduling and architecture : >> http://mesos.berkeley.edu/mesos_tech_report.pdf and >> https://www.cs.berkeley.edu/~alig/papers/drf.pdf. >> >> Regards, >> Joerg >> >> On Sat, Mar 14, 2015 at 2:15 PM, Kenneth Hui <[email protected]> wrote: >> >>> All, >>> >>> I am new to the Mesos project and have been reading up on the technology >>> and have questions for which I have not been able to find answers. I would >>> appreciate any answers to the questions below or links to where I can find >>> the answers myself. >>> >>> 1. How does the Master determine the order in which it offers >>> resources? Is it a simple round-robin, taking into account filters, or >>> is >>> there a algorithm that is followed? >>> >>> This is determined by the allocator where the standard is the Dominant >> Resource Fairness explained in the second paper above. >> For more details see here >> http://mesos.apache.org/documentation/latest/allocation-module/ >> >> >> >>> >>> 1. Are there any mechanisms where a framework can initiate an offer >>> request so that it receives the next resource offer or do frameworks >>> always >>> have to wait for the Master to decide the order of resource offers? >>> >>> Framework (Scheduler) have to wait for the Master to offer them >> ressources. See links in above answer for more details. >> >> >>> >>> 1. When a task is executed across a cluster, does the Master always >>> try to distribute the task across all slave nodes with sufficient >>> available >>> resources or would it ever run all task on a single node in the cluster >>> if >>> it has sufficient resources? >>> >>> The nodes announces free resources which the master then offers to the >> registered framework. So it depends on how many offers the framework(s) >> accept. >> >> >> >>> >>> 1. How does Mesos respond if all its slave nodes run out of physical >>> resources and are unable to offer sufficient resources for an extended >>> period of time? >>> >>> As long as the slave (process) is reachable from the master this is ok >> as the node is participating in the cluster (with 'old' jobs). >> >> >> >>> >>> Thank you for your help. >>> >>> >>> -- >>> Ken >>> >>> >>> >> >
