[Pacemaker] symmetrical ordering flaw for multi-state resources

[Gao,Yan]

It turned out to be a bug in pengine. Fixed and requested:
https://github.com/ClusterLabs/pacemaker/pull/595

Regards,
  Yan

On 30/09/2014 19:55, Gao,Yan wrote:
> Hi Youssef,
> I tried "promote" and it worked for my simple configuration.
> 
> Which version are you running? Is it possible to collect a
> hb_report/crm_report that covers the moment?
> 
> Regards,
>   Yan
> 
> On 09/30/2014 05:50 PM, Latrous, Youssef wrote:
>> Thank Yan for the answer.
>>
>> I think I found the issue. If you change the first action from "start" to "promote" than the issue happens (which was what I was using):
>>
>>     order order-msA-msB Mandatory: msA:promote msB:start symmetrical=false
>>
>> with meta attribute interleave=true.
>>
>> Why is there a difference here between the two actions? In other words, why does it work when we use:
>>     order order-msA-msB Mandatory: msA:start msB:start symmetrical=false
>>
>> and not when we use:
>>     order order-msA-msB Mandatory: msA:promote msB:start symmetrical=false
>>
>> Thanks,
>>
>> Youssef
>>
>> -----Original Message-----
>> Date: Fri, 26 Sep 2014 13:47:23 +0200
>> From: "Gao,Yan" <ygao at suse.com>
>> To: The Pacemaker cluster resource manager
>> 	<pacemaker at oss.clusterlabs.org>
>> Subject: Re: [Pacemaker] symmetrical ordering flaw for multi-state
>> 	resources
>> Message-ID: <5425524B.9010600 at suse.com>
>> Content-Type: text/plain; charset=windows-1252
>>
>> Hi Youssef,
>>
>> Is the order like:
>>
>> order order-msA-msB Mandatory: msA:start msB:start symmetrical=false
>>
>> ? and msA and msB have the meta attribute interleave=true? If so and it doesn't work, please collect a hb_report/crm_report covering the issue.
>>
>> Regards,
>>   Yan
>>
>> On 09/25/2014 08:13 PM, Latrous, Youssef wrote:
>>> Reposting from few weeks ago as I didn't get any answer yet :-(
>>>
>>> I included below the original post and tried to rephrase it in this second one, hoping my concern will be understood.
>>>
>>> I tried to use a dummy multi-state RA and have an asymmetrical ordering dependency to another resource (B). While an equivalent ordering to the same resource, but from a regular resource, works just fine, it did not work for the multi-state RA. What I mean by it didn't work is that it stopped the multi-state RA, when the resource (B) was stopped, but the regular resource kept running as expected (and documented in pacemaker)!
>>>
>>> Is this a bug in pacemaker or is it known to not work with multi-state RAs? Other possibility, there a different way of using the "symmetrical" option for multi-state RA ordering?
>>>
>>> Please, help!
>>>
>>> Regards,
>>>
>>> Youssef
>>>
>>> PS. Below is the original post.
>>>
>>> Hi,
>>>
>>> I was trying to express the following:
>>>    * Configure 3 resources:
>>>       * A: multi-state resource
>>>       * B: another multi-state resource
>>>       * C: regular primitive
>>>    * On startup sequence, when all resources were previously stopped, ensure the following mandatory ordering:
>>>       * A starts, then B
>>>       * A starts, then C
>>>    * After that, if A fails or restarts, do not impact B and C
>>>
>>> The docs state that setting the "symmetrical" option to "false" (...symmetrical=false) on the corresponding ordering constraints does the trick.
>>> This works just fine for resource C, but not for resource B.
>>>
>>> Is there a restriction I'm not aware of for the multi-state resources with regard to this option? That is the option "symmetrical" doesn't take effect on multi-state resources. Is there something extra that needs to be done/specified for the multi-state resources?
>>>
>>> Regards,
>>>
>>> Youssef L.
>>>
>>>
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>>>
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>>>
>>>
>>
>> --
>> Gao,Yan <ygao at suse.com>
>> Senior Software Engineer
>> SUSE LINUX Products GmbH
>>
> 

-- 
Gao,Yan <ygao at suse.com>
Senior Software Engineer
SUSE LINUX Products GmbH