[Pacemaker] [RFC] Automatic nodelist synchronization between corosync and pacemaker

[Andrew Beekhof]

I was in the process of replying...

On Tue, Feb 26, 2013 at 6:58 PM, Vladislav Bogdanov
<bubble at hoster-ok.com> wrote:
> Sorry for being annoying, but... bump.
>
> 18.02.2013 10:18, Vladislav Bogdanov wrote:
>> Hi Andrew, all,
>>
>> I had an idea last night, that it may be worth implementing
>> fully-dynamic cluster resize support in pacemaker, utilizing
>> possibilities CMAP and votequorum provide.
>>
>> Idea is to:
>> * Do not add nodes from nodelist to CIB if their join-count in cmap is
>> zero (but do not touch CIB nodes which exist in a nodelist and have zero
>> join-count in cmap).
>> * Install watches on a cmap nodelist.node and
>> runtime.totem.pg.mrp.srp.members subtrees (cmap_track_add).
>> * Add missing nodes to CIB as soon as they are both
>> ** defined in a nodelist
>> ** their join count becomes non-zero.
>> * Remove nodes from CIB when they are removed from a nodelist.
>>
>> Certainly, this requires some CMAP values (especially votequorum ones
>> and may be totem mode) to have some 'well-known' values, f.e. only UDPU
>> mode and quorum.allow_downscale=1, that should be defined yet.
>>
>> May be, it also have sense to make this depend on some new CMAP
>> variable, f.e. nodelist.dynamic=1.
>>
>> I would even try to implement this if general agreement is gained and
>> nobody else wants to implement this.
>>
>> Can you please comment on this?
>>
>> Vladislav
>>
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>
>
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