On 13-02-21 07:48 PM, Andrew Beekhof wrote: > On Fri, Feb 22, 2013 at 5:18 AM, Brian J. Murrell > <brian-squohqy54cvwr29bmmi...@public.gmane.org> wrote: >> I wonder what happens in the case of two racing "crm" commands that want >> to update the CIB (with non-overlapping/conflicting data). Is there any >> locking to ensure that one crm cannot overwrite the other's change? >> (i.e. second one to get there has to read in the new CIB before being >> able to apply his change and send it back) Or if there is a situation >> where one write stomps another's, > > If my information is up-to-date, yes. > > crmsh uses a read+modify+replace cycle, if B reads after A has read > but before the replace has happened, data will be lost.
Does crm_resource suffer from this problem or does it properly only send exactly the update to the CIB for the operation it's trying to achieve? Cheers, b.
signature.asc
Description: OpenPGP digital signature
_______________________________________________ Pacemaker mailing list: Pacemaker@oss.clusterlabs.org http://oss.clusterlabs.org/mailman/listinfo/pacemaker Project Home: http://www.clusterlabs.org Getting started: http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf Bugs: http://bugs.clusterlabs.org
