Re: how to fix active+remapped pg

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Search the docs or mailing list archives for a discussion of the CRUSH
tunables; you can see that's the problem here because CRUSH is only
mapping the PG to one OSD instead of two. :)
-Greg
Software Engineer #42 @ http://inktank.com | http://ceph.com


On Thu, Nov 14, 2013 at 4:40 AM, Ugis <ugis22@xxxxxxxxx> wrote:
> Hi,
>
> Got 1 pg which does not fix and I dont know how to make it.
>
> ceph version 0.67.4 (ad85b8bfafea6232d64cb7ba76a8b6e8252fa0c7)
> # ceph health detail
> HEALTH_WARN 1 pgs stuck unclean; recovery 23/4687006 degraded
> (0.000%); 6 near full osd(s)
> pg 4.2ab is stuck unclean for 172566.764239, current state
> active+remapped, last acting [7,5]
> recovery 23/4687006 degraded (0.000%)
> osd.2 is near full at 87%
> osd.3 is near full at 88%
> osd.4 is near full at 85%
> osd.5 is near full at 86%
> osd.6 is near full at 87%
> osd.9 is near full at 85%
>
> # ceph osd dump
> ...
> pool 4 'temp1' rep size 2 min_size 1 crush_ruleset 3 object_hash
> rjenkins pg_num 1300 pgp_num 1300 last_change 7039 owner 0
>         removed_snaps [1~3]
> ...
> pg_temp 4.2ab [7,5]
>
> # ceph pg map 4.2ab
> osdmap e7783 pg 4.2ab (4.2ab) -> up [7] acting [7,5]
>
> # ceph pg 4.2ab query
> { "state": "active+remapped",
>   "epoch": 7783,
>   "up": [
>         7],
>   "acting": [
>         7,
>         5],
>   "info": { "pgid": "4.2ab",
>       "last_update": "7752'114660",
>       "last_complete": "7752'114660",
>       "log_tail": "6874'111659",
>       "last_backfill": "MAX",
>       "purged_snaps": "[1~3]",
>       "history": { "epoch_created": 452,
>           "last_epoch_started": 7651,
>           "last_epoch_clean": 7651,
>           "last_epoch_split": 0,
>           "same_up_since": 7493,
>           "same_interval_since": 7650,
>           "same_primary_since": 7650,
>           "last_scrub": "7387'114067",
>           "last_scrub_stamp": "2013-11-12 01:07:46.610491",
>           "last_deep_scrub": "6874'103266",
>           "last_deep_scrub_stamp": "2013-11-07 16:49:45.483581",
>           "last_clean_scrub_stamp": "2013-11-12 01:07:46.610491"},
>       "stats": { "version": "7752'114660",
>           "reported_seq": "5635118",
>           "reported_epoch": "7783",
>           "state": "active+remapped",
>           "last_fresh": "2013-11-14 10:18:22.181241",
>           "last_change": "2013-11-12 17:14:34.141441",
>           "last_active": "2013-11-14 10:18:22.181241",
>           "last_clean": "2013-11-12 14:01:01.947846",
>           "last_became_active": "0.000000",
>           "last_unstale": "2013-11-14 10:18:22.181241",
>           "mapping_epoch": 7502,
>           "log_start": "6874'111659",
>           "ondisk_log_start": "6874'111659",
>           "created": 452,
>           "last_epoch_clean": 7651,
>           "parent": "0.0",
>           "parent_split_bits": 0,
>           "last_scrub": "7387'114067",
>           "last_scrub_stamp": "2013-11-12 01:07:46.610491",
>           "last_deep_scrub": "6874'103266",
>           "last_deep_scrub_stamp": "2013-11-07 16:49:45.483581",
>           "last_clean_scrub_stamp": "2013-11-12 01:07:46.610491",
>           "log_size": 3001,
>           "ondisk_log_size": 3001,
>           "stats_invalid": "0",
>           "stat_sum": { "num_bytes": 9453961216,
>               "num_objects": 2254,
>               "num_object_clones": 0,
>               "num_object_copies": 0,
>               "num_objects_missing_on_primary": 0,
>               "num_objects_degraded": 0,
>               "num_objects_unfound": 0,
>               "num_read": 456340,
>               "num_read_kb": 1825360,
>               "num_write": 14004,
>               "num_write_kb": 6942720,
>               "num_scrub_errors": 0,
>               "num_shallow_scrub_errors": 0,
>               "num_deep_scrub_errors": 0,
>               "num_objects_recovered": 4732,
>               "num_bytes_recovered": 19847446528,
>               "num_keys_recovered": 0},
>           "stat_cat_sum": {},
>           "up": [
>                 7],
>           "acting": [
>                 7,
>                 5]},
>       "empty": 0,
>       "dne": 0,
>       "incomplete": 0,
>       "last_epoch_started": 7651},
>   "recovery_state": [
>         { "name": "Started\/Primary\/Active",
>           "enter_time": "2013-11-12 17:14:34.001382",
>           "might_have_unfound": [],
>           "recovery_progress": { "backfill_target": -1,
>               "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": "2013-11-12 17:14:32.905963"}]}
>
>
> I have set all my osds to osd_backfill_full_ratio 90, so they are not
> blocking backfill because of this.
> Seems that problem is in osd 5 or 7 which should hold the pg, but I
> cached no related logs even after "ms 1"(lots of output, may be wrong
> grepping).
> Tried to scrub/deep-scrub this pg, but there seems no action going on
> after I issue commands.
>
> This state came after I had "full osd" and cluster blocked io. Then I
> did some reweighting and cluster now sits at this state for a day
> already.
>
> Any ideas how to trigger fixing of this stuck active+remapped pg 4.2ab?
>
> Ugis
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