On Sun, Jan 18, 2015 at 6:40 PM, ZHOU Yuan <dunk007@xxxxxxxxx> wrote: > Hi list, > > I'm trying to understand the RGW cache consistency model. My Ceph > cluster has multiple RGW instances with HAProxy as the load balancer. > HAProxy would choose one RGW instance to serve the request(with > round-robin). > The question is if RGW cache was enabled, which is the default > behavior, there seem to be some cache inconsistency issue. e.g., > object0 was cached in RGW-0 and RGW-1 at the same time. Sometime later > it was updated from RGW-0. In this case if the next read was issued to > RGW-1, the outdated cache would be served out then since RGW-1 wasn't > aware of the updates. Thus the data would be inconsistent. Is this > behavior expected or is there anything I missed? The RGW instances make use of the watch-notify primitive to keep their caches consistent. It shouldn't be a problem. -Greg _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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