Open Stack

On 04/10/14 at 11:33pm, Oleg Gelbukh wrote:
>Andrew,
>
>Thank you for clarification!
>
>
>On Thu, Apr 10, 2014 at 3:47 PM, Andrew Laski <andrew.laski at rackspace.com>wrote:
>>
>>
>> The scheduler as it currently exists is a placement engine.  There is
>> sufficient complexity in the scheduler with just that responsibility so I
>> would prefer to see anything that's making runtime decisions separated out.
>>  Perhaps it could just be another service within the scheduler project once
>> it's broken out, but I think it will be beneficial to have a clear
>> distinction between placement decisions and runtime monitoring.
>
>
>Do you think that auto-scaling could be considered another facet of this
>'runtime monitoring' functionality? Now it is a combination of Heat and
>Ceilometer. Does it worth moving to hypothetical runtime mobility service
>as well?

Auto-scaling is certainly a facet of runtime monitoring.  But 
auto-scaling performs actions based on a set of user defined rules and 
is very visible while the enhancements proposed below are intended to 
benefit deployers and be very invisible to users.  So the set of 
allowable actions is very constrained compared to what auto-scaling can 
do.  

In my opinion what's being proposed doesn't seem to fit cleanly into 
any existing service, so perhaps it could start as a standalone entity.  
Then once there's something that can be used and demoed a proper place 
might suggest itself, or it might make sense to keep it separate.


>
>--
>Best regards,
>Oleg Gelbukh
>
>
>>
>>
>>
>>> --
>>> Best regards,
>>> Oleg Gelbukh
>>>
>>>
>>> On Wed, Apr 9, 2014 at 7:47 PM, Jay Lau <jay.lau.513 at gmail.com> wrote:
>>>
>>>  @Oleg, Till now, I'm not sure the target of Gantt, is it for initial
>>>> placement policy or run time policy or both, can you help clarify?
>>>>
>>>> @Henrique, not sure if you know IBM PRS (Platform Resource Scheduler)
>>>> [1],
>>>> we have finished the "dynamic scheduler" in our Icehouse version (PRS
>>>> 2.2),
>>>> it has exactly the same feature as your described, we are planning a live
>>>> demo for this feature in Atlanta Summit. I'm also writing some document
>>>> for
>>>> run time policy which will cover more run time policies for OpenStack,
>>>> but
>>>> not finished yet. (My shame for the slow progress). The related blueprint
>>>> is [2], you can also get some discussion from [3]
>>>>
>>>> [1]
>>>> http://www-01.ibm.com/common/ssi/cgi-bin/ssialias?infotype=
>>>> AN&subtype=CA&htmlfid=897/ENUS213-590&appname=USN
>>>> [2]
>>>> https://blueprints.launchpad.net/nova/+spec/resource-
>>>> optimization-service
>>>> [3] http://markmail.org/~jaylau/OpenStack-DRS
>>>>
>>>> Thanks.
>>>>
>>>>
>>>> 2014-04-09 23:21 GMT+08:00 Oleg Gelbukh <ogelbukh at mirantis.com>:
>>>>
>>>> Henrique,
>>>>
>>>>>
>>>>> You should check out Gantt project [1], it could be exactly the place to
>>>>> implement such features. It is a generic cross-project Scheduler as a
>>>>> Service forked from Nova recently.
>>>>>
>>>>> [1] https://github.com/openstack/gantt
>>>>>
>>>>> --
>>>>> Best regards,
>>>>> Oleg Gelbukh
>>>>> Mirantis Labs
>>>>>
>>>>>
>>>>> On Wed, Apr 9, 2014 at 6:41 PM, Henrique Truta <
>>>>> henriquecostatruta at gmail.com> wrote:
>>>>>
>>>>>  Hello, everyone!
>>>>>>
>>>>>> I am currently a graduate student and member of a group of contributors
>>>>>> to OpenStack. We believe that a dynamic scheduler could improve the
>>>>>> efficiency of an OpenStack cloud, either by rebalancing nodes to
>>>>>> maximize
>>>>>> performance or to minimize the number of active hosts, in order to
>>>>>> minimize
>>>>>> energy costs. Therefore, we would like to propose a dynamic scheduling
>>>>>> mechanism to Nova. The main idea is using the Ceilometer information
>>>>>> (e.g.
>>>>>> RAM, CPU, disk usage) through the ceilometer-client and dinamically
>>>>>> decide
>>>>>> whether a instance should be live migrated.
>>>>>>
>>>>>> This might me done as a Nova periodic task, which will be executed
>>>>>> every
>>>>>> once in a given period or as a new independent project. In both cases,
>>>>>> the
>>>>>> current Nova scheduler will not be affected, since this new scheduler
>>>>>> will
>>>>>> be pluggable. We have done a search and found no such initiative in the
>>>>>> OpenStack BPs. Outside the community, we found only a recent IBM
>>>>>> announcement for a similiar feature in one of its cloud products.
>>>>>>
>>>>>> A possible flow is: In the new scheduler, we periodically make a call
>>>>>> to
>>>>>> Nova, get the instance list from a specific host and, for each
>>>>>> instance, we
>>>>>> make a call to the ceilometer-client (e.g. $ ceilometer statistics -m
>>>>>> cpu_util -q resource=$INSTANCE_ID) and then, according to some specific
>>>>>> parameters configured by the user, analyze the meters and do the proper
>>>>>> migrations.
>>>>>>
>>>>>> Do you have any comments or suggestions?
>>>>>>
>>>>>> --
>>>>>> Ítalo Henrique Costa Truta
>>>>>>
>>>>>>
>>>>>>
>>>>>> _______________________________________________
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>>>>>> OpenStack-dev at lists.openstack.org
>>>>>> http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev
>>>>>>
>>>>>>
>>>>>>
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>>>>>
>>>>>
>>>>>
>>>>
>>>> --
>>>> Thanks,
>>>>
>>>> Jay
>>>>
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>>>>
>>>>
>>>>
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