Software Engineer #42 @ http://inktank.com | http://ceph.com On Mon, Oct 27, 2014 at 1:52 AM, Plato Zhang <sangongs@xxxxxxxxx> wrote: > Hi, all! > > We are trying to utilize omap to store kv map. > > However, we couldn't find a proper way to scan a certain key range of omap. > > We do can use arg `max_return' to finish this job by iterating . > But if `max_return' is set too large, then there will be io waste > while the number of keys is few. > On the contrary, if it is set too small, then there will also be waste > while the number of keys is too many. > > Is there any solution? This functionality is not implemented in RADOS right now. It sounds like a good feature though! You can submit feature requests at tracker.ceph.com, or send in PRs. I think this should be fairly simple to implement, based on the "CEPH_OSD_OP_OMAPGETKEYS" section of ReplicatedPG::do_osd_ops, and then following the patterns in exposing it via librados. -Greg -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
