Ceph » RADOS

If we get an incoming Connection from a dead OSD, but never actually receive a Message from it, we never kill the Connection.
To do so, we'll need some way of determining that it's a dead OSD based just on address; which naively sounds prohibitively expensive. Sage suggests that we could change our "nonce" assignment to include information about the epoch the OSD asked to mark itself up; we would then be able to know if it's newer or older than our current map, and determine with a reasonably-priced lookup whether it is still up or not.