Fixing mark_unfound_lost revert failure

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FYI it is a known issue : http://tracker.ceph.com/issues/6109

On 01/09/2014 00:02, Loic Dachary wrote:
> Hi Ceph,
> 
> In a mixed dumpling / emperor cluster, because osd 2 has been removed but is still in
> 
>           "might_have_unfound": [
>                 { "osd": 2,
>                   "status": "osd is down"},
>                 { "osd": 6,
>                   "status": "already probed"}],
> 
> and because of that mark_unfound_lost fails with
> 
> # ceph pg 4.46 mark_unfound_lost revert
> Error EINVAL: pg has 1 objects but we haven't probed all sources, not marking lost
> 
> What would be the recommended way to fix this ?
> 
> FWIW the missing object is an XFS read error
> 
> # cp '/var/lib/ceph/osd/ceph-2/current/4.46_head/DIR_6/DIR_C/DIR_D/rbd\udata.9ad9d26b8b4567.00000000000007b1__head_0BC0BDC6__4' .
> cp: reading `/var/lib/ceph/osd/ceph-2/current/4.46_head/DIR_6/DIR_C/DIR_D/rbd\\udata.9ad9d26b8b4567.00000000000007b1__head_0BC0BDC6__4': Input/output error
> 
> that is not caught by xfs_repair and I expect the older version of the object on the remaining OSD to be OK.
> 
> Cheers
> 
> osd 6 is running
> # ceph --version
> ceph version 0.72.2 (a913ded2ff138aefb8cb84d347d72164099cfd60)
> 
> and
> osd 1 is running
> # ceph --version
> ceph version 0.67.4 (ad85b8bfafea6232d64cb7ba76a8b6e8252fa0c7)
> 
> # ceph pg 4.46 mark_unfound_lost revert
> Error EINVAL: pg has 1 objects but we haven't probed all sources, not marking lost
> # ceph pg 4.46 list_missing
> { "offset": { "oid": "",
>       "key": "",
>       "snapid": 0,
>       "hash": 0,
>       "max": 0,
>       "pool": -1,
>       "namespace": ""},
>   "num_missing": 1,
>   "num_unfound": 1,
>   "objects": [
>         { "oid": { "oid": "rbd_data.9ad9d26b8b4567.00000000000007b1",
>               "key": "",
>               "snapid": -2,
>               "hash": 197180870,
>               "max": 0,
>               "pool": 4,
>               "namespace": ""},
>           "need": "328685'1233912",
>           "have": "328683'1233904",
>           "locations": []}],
>   "more": 0}
> # ceph pg 4.46 query
> { "state": "active+recovering+degraded+remapped",
>   "epoch": 346424,
>   "up": [
>         6,
>         1],
>   "acting": [
>         1,
>         6],
>   "info": { "pgid": "4.46",
>       "last_update": "346424'1288927",
>       "last_complete": "0'0",
>       "log_tail": "328683'1233911",
>       "last_backfill": "MAX",
>       "purged_snaps": "[1~3]",
>       "history": { "epoch_created": 195,
>           "last_epoch_started": 346424,
>           "last_epoch_clean": 328685,
>           "last_epoch_split": 0,
>           "same_up_since": 346423,
>           "same_interval_since": 346423,
>           "same_primary_since": 346423,
>           "last_scrub": "328664'1230185",
>           "last_scrub_stamp": "2014-08-23 09:34:01.524854",
>           "last_deep_scrub": "328604'1208887",
>           "last_deep_scrub_stamp": "2014-08-20 09:33:19.073523",
>           "last_clean_scrub_stamp": "2014-08-23 09:34:01.524854"},
>       "stats": { "version": "346424'1288927",
>           "reported_seq": "2553234",
>           "reported_epoch": "346424",
>           "state": "active+recovering+degraded+remapped",
>           "last_fresh": "2014-08-31 23:47:49.866548",
>           "last_change": "2014-08-31 23:44:22.571492",
>           "last_active": "2014-08-31 23:47:49.866548",
>           "last_clean": "2014-08-23 22:27:23.391412",
>           "last_became_active": "0.000000",
>           "last_unstale": "2014-08-31 23:47:49.866548",
>           "mapping_epoch": 346421,
>           "log_start": "328683'1233911",
>           "ondisk_log_start": "328683'1233911",
>           "created": 195,
>           "last_epoch_clean": 328685,
>           "parent": "0.0",
>           "parent_split_bits": 0,
>           "last_scrub": "328664'1230185",
>           "last_scrub_stamp": "2014-08-23 09:34:01.524854",
>           "last_deep_scrub": "328604'1208887",
>           "last_deep_scrub_stamp": "2014-08-20 09:33:19.073523",
>           "last_clean_scrub_stamp": "2014-08-23 09:34:01.524854",
>           "log_size": 55016,
>           "ondisk_log_size": 55016,
>           "stats_invalid": "0",
>           "stat_sum": { "num_bytes": 12584300544,
>               "num_objects": 3035,
>               "num_object_clones": 1,
>               "num_object_copies": 0,
>               "num_objects_missing_on_primary": 0,
>               "num_objects_degraded": 0,
>               "num_objects_unfound": 0,
>               "num_read": 51123,
>               "num_read_kb": 1525186,
>               "num_write": 1288927,
>               "num_write_kb": 19076876,
>               "num_scrub_errors": 0,
>               "num_shallow_scrub_errors": 0,
>               "num_deep_scrub_errors": 0,
>               "num_objects_recovered": 20047,
>               "num_bytes_recovered": 78532055040,
>               "num_keys_recovered": 0},
>           "stat_cat_sum": {},
>           "up": [
>                 6,
>                 1],
>           "acting": [
>                 1,
>                 6]},
>       "empty": 0,
>       "dne": 0,
>       "incomplete": 0,
>       "last_epoch_started": 346424},
>   "recovery_state": [
>         { "name": "Started\/Primary\/Active",
>           "enter_time": "2014-08-31 23:44:22.435483",
>           "might_have_unfound": [
>                 { "osd": 2,
>                   "status": "osd is down"},
>                 { "osd": 6,
>                   "status": "already probed"}],
>           "recovery_progress": { "backfill_target": 6,
>               "waiting_on_backfill": 0,
>               "backfill_pos": "0\/\/0\/\/-1",
>               "backfill_info": { "begin": "0\/\/0\/\/-1",
>                   "end": "0\/\/0\/\/-1",
>                   "objects": []},
>               "peer_backfill_info": { "begin": "0\/\/0\/\/-1",
>                   "end": "0\/\/0\/\/-1",
>                   "objects": []},
>               "backfills_in_flight": [],
>               "pull_from_peer": [],
>               "pushing": []},
>           "scrub": { "scrubber.epoch_start": "0",
>               "scrubber.active": 0,
>               "scrubber.block_writes": 0,
>               "scrubber.finalizing": 0,
>               "scrubber.waiting_on": 0,
>               "scrubber.waiting_on_whom": []}},
>         { "name": "Started",
>           "enter_time": "2014-08-31 23:44:21.177460"}]}
> 

-- 
Lo?c Dachary, Artisan Logiciel Libre

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