Ceph » RADOS

Setting last_force_op_resend but not last_force_op_resend_prenautilus and last_force_op_resend_preluminous doesn't make sense. The reverse, such as

last_force_op_resend = 0
last_force_op_resend_prenautilus = 0
last_force_op_resend_preluminous = 20

or

last_force_op_resend = 0
last_force_op_resend_prenautilus = 40
last_force_op_resend_preluminous = 40

is valid in PG split/merge cases (and is the reason prenautilus and preluminous fields actually exist and aren't just encoding artifacts), but, if last_force_op_resend is set, both prenautilus and preluminous fields should really be set to the same value. Otherwise it basically amounts to "nautilus+ clients need to resend in-flight ops on stretch mode transitions but pre-nautilus clients don't" which is bogus as it leaves pre-nautilus clients exposed to the nastiness that necessitated employing the force resend hammer in the first place in https://github.com/ceph/ceph/commit/97fbd19ccd02046cb643239ac3c6fcb8404b4445.