[Gluster-devel] Glusterd: A New Hope
joe at julianfamily.org
Tue Mar 26 15:19:41 UTC 2013
Anand Babu Periasamy <abperiasamy at gmail.com> wrote:
>On Tue, Mar 26, 2013 at 5:59 AM, Jeff Darcy <jdarcy at redhat.com> wrote:
>> On 03/25/2013 11:59 PM, Anand Babu Periasamy wrote:
>>> gluster meta-volume + zeromq for notification (pub/sub) will solve
>>> problems largely and still be light weight. In a large scale
>>> deployment, it is not a good idea to declare all the servers as
>>> coordination servers. Since meta-volume is a regular distributed
>>> replicated gluster volume, it can always be expanded later depending
>>> on the load and availability requirements.
>> How do you propose to solve the bootstrap problem? How do we choose
>> which subset of all servers would have pieces of this meta-volume?
>> How do we coordinate its expansion, or detect and respond to failures
>Admin declares the config servers manually. Automatic option is a
>disaster waiting to happen.
>We should set the minimum number of config servers required by default
>to 3, so that we can enforce quorum. Any failure would require the
>admin to declare replacement config servers manually.
On that note, the additional quorum functionality should be implemented with regard to watchers before using a glusterfs store for configuration coordination.
>From what I've been reading, the biggest thing zookeeper has over any other solution is its robustness with regard to split-brain. If that was managed it seems like that would open up a number of possibilities to satisfy the other requirements.
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