[root@c71 ~]# rbd ls --debug_objecter=20
2015-03-18 17:05:43.800815 7f8b17e68700 10 client.?.objecter ms_handle_connect 0x1422550
2015-03-18 17:05:43.800842 7f8b17e68700 10 client.?.objecter resend_mon_ops
2015-03-18 17:05:43.802396 7f8b2009e880 10 client.7207.objecter _maybe_request_map subscribing (onetime) to next osd map
2015-03-18 17:05:43.803226 7f8b17e68700 10 client.7207.objecter ms_dispatch 0x13face0 osd_map(421..421 src has 1..421) v3
2015-03-18 17:05:43.803237 7f8b17e68700  3 client.7207.objecter handle_osd_map got epochs [421,421] > 0
2015-03-18 17:05:43.803241 7f8b17e68700  3 client.7207.objecter handle_osd_map decoding full epoch 421
2015-03-18 17:05:43.803350 7f8b17e68700 20 client.7207.objecter dump_active .. 0 homeless
2015-03-18 17:05:43.803380 7f8b17e68700 10 client.7207.objecter ms_dispatch 0x13face0 osd_map(421..421 src has 1..421) v3
2015-03-18 17:05:43.803382 7f8b17e68700  3 client.7207.objecter handle_osd_map ignoring epochs [421,421] <= 421
2015-03-18 17:05:43.803383 7f8b17e68700 20 client.7207.objecter dump_active .. 0 homeless
2015-03-18 17:05:43.803477 7f8b2009e880 20 librbd: list 0x7fffc9486010
2015-03-18 17:05:43.803511 7f8b2009e880 10 client.7207.objecter _op_submit op 0x1420b70
2015-03-18 17:05:43.803540 7f8b2009e880 10 client.7207.objecter _calc_target  pgid 2.30a98c1c acting []
2015-03-18 17:05:43.803546 7f8b2009e880 20 client.7207.objecter _get_session osd=-1 returning homeless
2015-03-18 17:05:43.803548 7f8b2009e880 20 client.7207.objecter  note: not requesting commit
2015-03-18 17:05:43.803549 7f8b2009e880 10 client.7207.objecter _op_submit oid rbd_directory @2 @2 [read 0~0] tid 0 osd.-1
2015-03-18 17:05:43.803556 7f8b2009e880 10 client.7207.objecter _maybe_request_map subscribing (onetime) to next osd map
2015-03-18 17:05:43.803575 7f8b2009e880 15 client.7207.objecter _session_op_assign -1 1
2015-03-18 17:05:43.803578 7f8b2009e880  5 client.7207.objecter 1 unacked, 0 uncommitted
2015-03-18 17:05:48.802604 7f8b18669700 10 client.7207.objecter tick
2015-03-18 17:05:48.802706 7f8b18669700 10 client.7207.objecter _maybe_request_map subscribing (onetime) to next osd map
2015-03-18 17:05:53.802893 7f8b18669700 10 client.7207.objecter tick
2015-03-18 17:05:53.802922 7f8b18669700 10 client.7207.objecter _maybe_request_map subscribing (onetime) to next osd map
2015-03-18 17:05:58.803120 7f8b18669700 10 client.7207.objecter tick
2015-03-18 17:05:58.803152 7f8b18669700 10 client.7207.objecter _maybe_request_map subscribing (onetime) to next osd map
2015-03-18 17:06:03.803369 7f8b18669700 10 client.7207.objecter tick
2015-03-18 17:06:03.803400 7f8b18669700 10 client.7207.objecter _maybe_request_map subscribing (onetime) to next osd map