Re: PG stuck at recovery

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You don't say anything about the Ceph version you are running.
I had an similar issue with 17.2.7, and is seams to be an issue with mclock,
when I switch to wpq everything worked again.

You can read more about it here
https://lists.ceph.io/hyperkitty/list/ceph-users@xxxxxxx/thread/IPHBE3DLW5ABCZHSNYOBUBSI3TLWVD22/#OE3QXLAJIY6NU7PNMGHP47UK2CBZJPUG

- Kai Stian Olstad


On Tue, Feb 06, 2024 at 06:35:26AM -0000, LeonGao  wrote:
Hi community

We have a new Ceph cluster deployment with 100 nodes. When we are draining an OSD host from the cluster, we see a small amount of PGs that cannot make any progress to the end. From the logs and metrics, it seems like the recovery progress is stuck (0 recovery ops for several days). Would like to get some ideas on this. Re-peering and OSD restart do resolve to mitigate the issue but we want to get to the root cause of it as draining and recovery happen frequently.

I have put some debugging information below. Any help is appreciated, thanks!

ceph -s
   pgs:     4210926/7380034104 objects misplaced (0.057%)
            41198 active+clean
            71    active+remapped+backfilling
            12    active+recovering

One of the stuck PG:
6.38f1   active+remapped+backfilling             [313,643,727]         313             [313,643,717]             313

PG query result:

ceph pg 6.38f1 query
{
   "snap_trimq": "[]",
   "snap_trimq_len": 0,
   "state": "active+remapped+backfilling",
   "epoch": 246856,
   "up": [
       313,
       643,
       727
   ],
   "acting": [
       313,
       643,
       717
   ],
   "backfill_targets": [
       "727"
   ],
   "acting_recovery_backfill": [
       "313",
       "643",
       "717",
       "727"
   ],
   "info": {
       "pgid": "6.38f1",
       "last_update": "212333'38916",
       "last_complete": "212333'38916",
       "log_tail": "80608'37589",
       "last_user_version": 38833,
       "last_backfill": "MAX",
       "purged_snaps": [],
       "history": {
           "epoch_created": 3726,
           "epoch_pool_created": 3279,
           "last_epoch_started": 243987,
           "last_interval_started": 243986,
           "last_epoch_clean": 220174,
           "last_interval_clean": 220173,
           "last_epoch_split": 3726,
           "last_epoch_marked_full": 0,
           "same_up_since": 238347,
           "same_interval_since": 243986,
           "same_primary_since": 3728,
           "last_scrub": "212333'38916",
           "last_scrub_stamp": "2024-01-29T13:43:10.654709+0000",
           "last_deep_scrub": "212333'38916",
           "last_deep_scrub_stamp": "2024-01-28T07:43:45.920198+0000",
           "last_clean_scrub_stamp": "2024-01-29T13:43:10.654709+0000",
           "prior_readable_until_ub": 0
       },
       "stats": {
           "version": "212333'38916",
           "reported_seq": 413425,
           "reported_epoch": 246856,
           "state": "active+remapped+backfilling",
           "last_fresh": "2024-02-05T21:14:40.838785+0000",
           "last_change": "2024-02-03T22:33:43.052272+0000",
           "last_active": "2024-02-05T21:14:40.838785+0000",
           "last_peered": "2024-02-05T21:14:40.838785+0000",
           "last_clean": "2024-02-03T04:26:35.168232+0000",
           "last_became_active": "2024-02-03T22:31:16.037823+0000",
           "last_became_peered": "2024-02-03T22:31:16.037823+0000",
           "last_unstale": "2024-02-05T21:14:40.838785+0000",
           "last_undegraded": "2024-02-05T21:14:40.838785+0000",
           "last_fullsized": "2024-02-05T21:14:40.838785+0000",
           "mapping_epoch": 243986,
           "log_start": "80608'37589",
           "ondisk_log_start": "80608'37589",
           "created": 3726,
           "last_epoch_clean": 220174,
           "parent": "0.0",
           "parent_split_bits": 14,
           "last_scrub": "212333'38916",
           "last_scrub_stamp": "2024-01-29T13:43:10.654709+0000",
           "last_deep_scrub": "212333'38916",
           "last_deep_scrub_stamp": "2024-01-28T07:43:45.920198+0000",
           "last_clean_scrub_stamp": "2024-01-29T13:43:10.654709+0000",
           "objects_scrubbed": 17743,
           "log_size": 1327,
           "log_dups_size": 3000,
           "ondisk_log_size": 1327,
           "stats_invalid": false,
           "dirty_stats_invalid": false,
           "omap_stats_invalid": false,
           "hitset_stats_invalid": false,
           "hitset_bytes_stats_invalid": false,
           "pin_stats_invalid": false,
           "manifest_stats_invalid": false,
           "snaptrimq_len": 0,
           "last_scrub_duration": 29,
           "scrub_schedule": "queued for deep scrub",
           "scrub_duration": 28.699844475999999,
           "objects_trimmed": 0,
           "snaptrim_duration": 0,
           "stat_sum": {
               "num_bytes": 67167022618,
               "num_objects": 17743,
               "num_object_clones": 0,
               "num_object_copies": 53229,
               "num_objects_missing_on_primary": 0,
               "num_objects_missing": 0,
               "num_objects_degraded": 0,
               "num_objects_misplaced": 12401,
               "num_objects_unfound": 0,
               "num_objects_dirty": 17743,
               "num_whiteouts": 0,
               "num_read": 16640,
               "num_read_kb": 30923655,
               "num_write": 55094,
               "num_write_kb": 71824558,
               "num_scrub_errors": 0,
               "num_shallow_scrub_errors": 0,
               "num_deep_scrub_errors": 0,
               "num_objects_recovered": 40746,
               "num_bytes_recovered": 154245233300,
               "num_keys_recovered": 0,
               "num_objects_omap": 0,
               "num_objects_hit_set_archive": 0,
               "num_bytes_hit_set_archive": 0,
               "num_flush": 0,
               "num_flush_kb": 0,
               "num_evict": 0,
               "num_evict_kb": 0,
               "num_promote": 0,
               "num_flush_mode_high": 0,
               "num_flush_mode_low": 0,
               "num_evict_mode_some": 0,
               "num_evict_mode_full": 0,
               "num_objects_pinned": 0,
               "num_legacy_snapsets": 0,
               "num_large_omap_objects": 0,
               "num_objects_manifest": 0,
               "num_omap_bytes": 0,
               "num_omap_keys": 0,
               "num_objects_repaired": 0
           },
           "up": [
               313,
               643,
               727
           ],
           "acting": [
               313,
               643,
               717
           ],
           "avail_no_missing": [
               "313",
               "643",
               "717"
           ],
           "object_location_counts": [
               {
                   "shards": "313,643,717",
                   "objects": 17743
               }
           ],
           "blocked_by": [],
           "up_primary": 313,
           "acting_primary": 313,
           "purged_snaps": []
       },
       "empty": 0,
       "dne": 0,
       "incomplete": 0,
       "last_epoch_started": 243987,
       "hit_set_history": {
           "current_last_update": "0'0",
           "history": []
       }
   },
   "peer_info": [
       {
           "peer": "643",
           "pgid": "6.38f1",
           "last_update": "212333'38916",
           "last_complete": "212333'38916",
           "log_tail": "80608'37589",
           "last_user_version": 38833,
           "last_backfill": "MAX",
           "purged_snaps": [],
           "history": {
               "epoch_created": 3726,
               "epoch_pool_created": 3279,
               "last_epoch_started": 243987,
               "last_interval_started": 243986,
               "last_epoch_clean": 220174,
               "last_interval_clean": 220173,
               "last_epoch_split": 3726,
               "last_epoch_marked_full": 0,
               "same_up_since": 238347,
               "same_interval_since": 243986,
               "same_primary_since": 3728,
               "last_scrub": "212333'38916",
               "last_scrub_stamp": "2024-01-29T13:43:10.654709+0000",
               "last_deep_scrub": "212333'38916",
               "last_deep_scrub_stamp": "2024-01-28T07:43:45.920198+0000",
               "last_clean_scrub_stamp": "2024-01-29T13:43:10.654709+0000",
               "prior_readable_until_ub": 0
           },
           "stats": {
               "version": "212331'38915",
               "reported_seq": 362849,
               "reported_epoch": 212333,
               "state": "active+clean+scrubbing+deep",
               "last_fresh": "2024-01-28T07:43:40.515729+0000",
               "last_change": "2024-01-28T06:20:14.969313+0000",
               "last_active": "2024-01-28T07:43:40.515729+0000",
               "last_peered": "2024-01-28T07:43:40.515729+0000",
               "last_clean": "2024-01-28T07:43:40.515729+0000",
               "last_became_active": "2024-01-23T10:01:07.710478+0000",
               "last_became_peered": "2024-01-23T10:01:07.710478+0000",
               "last_unstale": "2024-01-28T07:43:40.515729+0000",
               "last_undegraded": "2024-01-28T07:43:40.515729+0000",
               "last_fullsized": "2024-01-28T07:43:40.515729+0000",
               "mapping_epoch": 243986,
               "log_start": "80608'37589",
               "ondisk_log_start": "80608'37589",
               "created": 3726,
               "last_epoch_clean": 123203,
               "parent": "0.0",
               "parent_split_bits": 14,
               "last_scrub": "80609'38697",
               "last_scrub_stamp": "2024-01-09T20:27:40.795531+0000",
               "last_deep_scrub": "80609'38697",
               "last_deep_scrub_stamp": "2024-01-07T08:20:59.246940+0000",
               "last_clean_scrub_stamp": "2024-01-09T20:27:40.795531+0000",
               "objects_scrubbed": 17724,
               "log_size": 1326,
               "log_dups_size": 3000,
               "ondisk_log_size": 1326,
               "stats_invalid": false,
               "dirty_stats_invalid": false,
               "omap_stats_invalid": false,
               "hitset_stats_invalid": false,
               "hitset_bytes_stats_invalid": false,
               "pin_stats_invalid": false,
               "manifest_stats_invalid": false,
               "snaptrimq_len": 0,
               "last_scrub_duration": 29,
               "scrub_schedule": "deep scrubbing for 5005s",
               "scrub_duration": 28.446739284,
               "objects_trimmed": 0,
               "snaptrim_duration": 0,
               "stat_sum": {
                   "num_bytes": 67167022618,
                   "num_objects": 17743,
                   "num_object_clones": 0,
                   "num_object_copies": 53229,
                   "num_objects_missing_on_primary": 0,
                   "num_objects_missing": 0,
                   "num_objects_degraded": 0,
                   "num_objects_misplaced": 0,
                   "num_objects_unfound": 0,
                   "num_objects_dirty": 17743,
                   "num_whiteouts": 0,
                   "num_read": 16640,
                   "num_read_kb": 30923655,
                   "num_write": 55094,
                   "num_write_kb": 71824558,
                   "num_scrub_errors": 0,
                   "num_shallow_scrub_errors": 0,
                   "num_deep_scrub_errors": 0,
                   "num_objects_recovered": 35403,
                   "num_bytes_recovered": 134021819371,
                   "num_keys_recovered": 0,
                   "num_objects_omap": 0,
                   "num_objects_hit_set_archive": 0,
                   "num_bytes_hit_set_archive": 0,
                   "num_flush": 0,
                   "num_flush_kb": 0,
                   "num_evict": 0,
                   "num_evict_kb": 0,
                   "num_promote": 0,
                   "num_flush_mode_high": 0,
                   "num_flush_mode_low": 0,
                   "num_evict_mode_some": 0,
                   "num_evict_mode_full": 0,
                   "num_objects_pinned": 0,
                   "num_legacy_snapsets": 0,
                   "num_large_omap_objects": 0,
                   "num_objects_manifest": 0,
                   "num_omap_bytes": 0,
                   "num_omap_keys": 0,
                   "num_objects_repaired": 0
               },
               "up": [
                   313,
                   643,
                   727
               ],
               "acting": [
                   313,
                   643,
                   717
               ],
               "avail_no_missing": [],
               "object_location_counts": [],
               "blocked_by": [],
               "up_primary": 313,
               "acting_primary": 313,
               "purged_snaps": []
           },
           "empty": 0,
           "dne": 0,
           "incomplete": 0,
           "last_epoch_started": 243987,
           "hit_set_history": {
               "current_last_update": "0'0",
               "history": []
           }
       },
       {
           "peer": "717",
           "pgid": "6.38f1",
           "last_update": "212333'38916",
           "last_complete": "212333'38916",
           "log_tail": "80608'37589",
           "last_user_version": 0,
           "last_backfill": "MAX",
           "purged_snaps": [],
           "history": {
               "epoch_created": 3726,
               "epoch_pool_created": 3279,
               "last_epoch_started": 243987,
               "last_interval_started": 243986,
               "last_epoch_clean": 220174,
               "last_interval_clean": 220173,
               "last_epoch_split": 3726,
               "last_epoch_marked_full": 0,
               "same_up_since": 238347,
               "same_interval_since": 243986,
               "same_primary_since": 3728,
               "last_scrub": "212333'38916",
               "last_scrub_stamp": "2024-01-29T13:43:10.654709+0000",
               "last_deep_scrub": "212333'38916",
               "last_deep_scrub_stamp": "2024-01-28T07:43:45.920198+0000",
               "last_clean_scrub_stamp": "2024-01-29T13:43:10.654709+0000",
               "prior_readable_until_ub": 0
           },
           "stats": {
               "version": "212331'38915",
               "reported_seq": 362849,
               "reported_epoch": 212333,
               "state": "active+clean+scrubbing+deep",
               "last_fresh": "2024-01-28T07:43:40.515729+0000",
               "last_change": "2024-01-28T06:20:14.969313+0000",
               "last_active": "2024-01-28T07:43:40.515729+0000",
               "last_peered": "2024-01-28T07:43:40.515729+0000",
               "last_clean": "2024-01-28T07:43:40.515729+0000",
               "last_became_active": "2024-01-23T10:01:07.710478+0000",
               "last_became_peered": "2024-01-23T10:01:07.710478+0000",
               "last_unstale": "2024-01-28T07:43:40.515729+0000",
               "last_undegraded": "2024-01-28T07:43:40.515729+0000",
               "last_fullsized": "2024-01-28T07:43:40.515729+0000",
               "mapping_epoch": 243986,
               "log_start": "80608'37589",
               "ondisk_log_start": "80608'37589",
               "created": 3726,
               "last_epoch_clean": 123203,
               "parent": "0.0",
               "parent_split_bits": 14,
               "last_scrub": "80609'38697",
               "last_scrub_stamp": "2024-01-09T20:27:40.795531+0000",
               "last_deep_scrub": "80609'38697",
               "last_deep_scrub_stamp": "2024-01-07T08:20:59.246940+0000",
               "last_clean_scrub_stamp": "2024-01-09T20:27:40.795531+0000",
               "objects_scrubbed": 17724,
               "log_size": 1326,
               "log_dups_size": 3000,
               "ondisk_log_size": 1326,
               "stats_invalid": false,
               "dirty_stats_invalid": false,
               "omap_stats_invalid": false,
               "hitset_stats_invalid": false,
               "hitset_bytes_stats_invalid": false,
               "pin_stats_invalid": false,
               "manifest_stats_invalid": false,
               "snaptrimq_len": 0,
               "last_scrub_duration": 29,
               "scrub_schedule": "deep scrubbing for 5005s",
               "scrub_duration": 28.446739284,
               "objects_trimmed": 0,
               "snaptrim_duration": 0,
               "stat_sum": {
                   "num_bytes": 67167022618,
                   "num_objects": 17743,
                   "num_object_clones": 0,
                   "num_object_copies": 53229,
                   "num_objects_missing_on_primary": 0,
                   "num_objects_missing": 0,
                   "num_objects_degraded": 0,
                   "num_objects_misplaced": 0,
                   "num_objects_unfound": 0,
                   "num_objects_dirty": 17743,
                   "num_whiteouts": 0,
                   "num_read": 16640,
                   "num_read_kb": 30923655,
                   "num_write": 55094,
                   "num_write_kb": 71824558,
                   "num_scrub_errors": 0,
                   "num_shallow_scrub_errors": 0,
                   "num_deep_scrub_errors": 0,
                   "num_objects_recovered": 35403,
                   "num_bytes_recovered": 134021819371,
                   "num_keys_recovered": 0,
                   "num_objects_omap": 0,
                   "num_objects_hit_set_archive": 0,
                   "num_bytes_hit_set_archive": 0,
                   "num_flush": 0,
                   "num_flush_kb": 0,
                   "num_evict": 0,
                   "num_evict_kb": 0,
                   "num_promote": 0,
                   "num_flush_mode_high": 0,
                   "num_flush_mode_low": 0,
                   "num_evict_mode_some": 0,
                   "num_evict_mode_full": 0,
                   "num_objects_pinned": 0,
                   "num_legacy_snapsets": 0,
                   "num_large_omap_objects": 0,
                   "num_objects_manifest": 0,
                   "num_omap_bytes": 0,
                   "num_omap_keys": 0,
                   "num_objects_repaired": 0
               },
               "up": [
                   313,
                   643,
                   727
               ],
               "acting": [
                   313,
                   643,
                   717
               ],
               "avail_no_missing": [],
               "object_location_counts": [],
               "blocked_by": [],
               "up_primary": 313,
               "acting_primary": 313,
               "purged_snaps": []
           },
           "empty": 0,
           "dne": 0,
           "incomplete": 0,
           "last_epoch_started": 243987,
           "hit_set_history": {
               "current_last_update": "0'0",
               "history": []
           }
       },
       {
           "peer": "726",
           "pgid": "6.38f1",
           "last_update": "212333'38916",
           "last_complete": "212333'38916",
           "log_tail": "80608'37589",
           "last_user_version": 0,
           "last_backfill": "MIN",
           "purged_snaps": [],
           "history": {
               "epoch_created": 3726,
               "epoch_pool_created": 3279,
               "last_epoch_started": 238348,
               "last_interval_started": 238347,
               "last_epoch_clean": 220174,
               "last_interval_clean": 220173,
               "last_epoch_split": 3726,
               "last_epoch_marked_full": 0,
               "same_up_since": 238347,
               "same_interval_since": 243986,
               "same_primary_since": 3728,
               "last_scrub": "212333'38916",
               "last_scrub_stamp": "2024-01-29T13:43:10.654709+0000",
               "last_deep_scrub": "212333'38916",
               "last_deep_scrub_stamp": "2024-01-28T07:43:45.920198+0000",
               "last_clean_scrub_stamp": "2024-01-29T13:43:10.654709+0000",
               "prior_readable_until_ub": 11.834917336
           },
           "stats": {
               "version": "0'0",
               "reported_seq": 0,
               "reported_epoch": 0,
               "state": "unknown",
               "last_fresh": "0.000000",
               "last_change": "0.000000",
               "last_active": "0.000000",
               "last_peered": "0.000000",
               "last_clean": "0.000000",
               "last_became_active": "0.000000",
               "last_became_peered": "0.000000",
               "last_unstale": "0.000000",
               "last_undegraded": "0.000000",
               "last_fullsized": "0.000000",
               "mapping_epoch": 243986,
               "log_start": "0'0",
               "ondisk_log_start": "0'0",
               "created": 0,
               "last_epoch_clean": 0,
               "parent": "0.0",
               "parent_split_bits": 0,
               "last_scrub": "0'0",
               "last_scrub_stamp": "0.000000",
               "last_deep_scrub": "0'0",
               "last_deep_scrub_stamp": "0.000000",
               "last_clean_scrub_stamp": "0.000000",
               "objects_scrubbed": 0,
               "log_size": 0,
               "log_dups_size": 0,
               "ondisk_log_size": 0,
               "stats_invalid": false,
               "dirty_stats_invalid": false,
               "omap_stats_invalid": false,
               "hitset_stats_invalid": false,
               "hitset_bytes_stats_invalid": false,
               "pin_stats_invalid": false,
               "manifest_stats_invalid": false,
               "snaptrimq_len": 0,
               "last_scrub_duration": 0,
               "scrub_schedule": "--",
               "scrub_duration": 0,
               "objects_trimmed": 0,
               "snaptrim_duration": 0,
               "stat_sum": {
                   "num_bytes": 4194304,
                   "num_objects": 0,
                   "num_object_clones": 0,
                   "num_object_copies": 0,
                   "num_objects_missing_on_primary": 0,
                   "num_objects_missing": 17743,
                   "num_objects_degraded": 0,
                   "num_objects_misplaced": 0,
                   "num_objects_unfound": 0,
                   "num_objects_dirty": 0,
                   "num_whiteouts": 0,
                   "num_read": 0,
                   "num_read_kb": 0,
                   "num_write": 0,
                   "num_write_kb": 0,
                   "num_scrub_errors": 0,
                   "num_shallow_scrub_errors": 0,
                   "num_deep_scrub_errors": 0,
                   "num_objects_recovered": 0,
                   "num_bytes_recovered": 0,
                   "num_keys_recovered": 0,
                   "num_objects_omap": 0,
                   "num_objects_hit_set_archive": 0,
                   "num_bytes_hit_set_archive": 0,
                   "num_flush": 0,
                   "num_flush_kb": 0,
                   "num_evict": 0,
                   "num_evict_kb": 0,
                   "num_promote": 0,
                   "num_flush_mode_high": 0,
                   "num_flush_mode_low": 0,
                   "num_evict_mode_some": 0,
                   "num_evict_mode_full": 0,
                   "num_objects_pinned": 0,
                   "num_legacy_snapsets": 0,
                   "num_large_omap_objects": 0,
                   "num_objects_manifest": 0,
                   "num_omap_bytes": 0,
                   "num_omap_keys": 0,
                   "num_objects_repaired": 0
               },
               "up": [
                   313,
                   643,
                   727
               ],
               "acting": [
                   313,
                   643,
                   717
               ],
               "avail_no_missing": [],
               "object_location_counts": [],
               "blocked_by": [],
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}
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