Red Hat Bugzilla – Bug 765555
Add command-line support for enforce-quorum option
Last modified: 2013-12-18 19:07:06 EST
Now that it's a feature in the code, might as well provide an easy way to enable it. Still NO_DOC, though, since we don't necessarily want people changing it without being briefed on the implications.
How about making quorum count configurable too?
(In reply to comment #1)
> How about making quorum count configurable too?
What would the options be? Quorum count (Q) is already determined algorithmically, based on the total replica count (R). Let's examine the cases.
* Q=1 is equivalent to no quorum enforcement, except that writers get EROFS instead of EIO. Not sure if this is useful.
* Q=2, R=2 (i.e. no special case for first brick) seems marginally useful.
* Q=2, R=3 is what we already get for any R=3.
* Q=3, R=3 also seems marginally useful.
* R>3 will remain too rare to worry about.
So both of the marginally useful cases require unanimity. Would it make more sense to have a separate quorum-count option, or allow enforce-quorum (quorum-type) to have more than two values?
* "none" = no enforcement
* "majority" = what's there now
* "all" = require presence of all servers
CHANGE: http://review.gluster.com/743 (Change-Id: Ia52ddb551e24c27969f7f5fa0f94c1044789731f) merged in master by Vijay Bellur (email@example.com)