summaryrefslogtreecommitdiffstats
path: root/src/mon/Monitor.h
blob: 5d567cc4b3f56bc533983f5d4967a778450d724d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
// vim: ts=8 sw=2 smarttab
/*
 * Ceph - scalable distributed file system
 *
 * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
 *
 * This is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License version 2.1, as published by the Free Software 
 * Foundation.  See file COPYING.
 * 
 */

/* 
 * This is the top level monitor. It runs on each machine in the Monitor   
 * Cluster. The election of a leader for the paxos algorithm only happens 
 * once per machine via the elector. There is a separate paxos instance (state) 
 * kept for each of the system components: Object Store Device (OSD) Monitor, 
 * Placement Group (PG) Monitor, Metadata Server (MDS) Monitor, and Client Monitor.
 */

#ifndef CEPH_MONITOR_H
#define CEPH_MONITOR_H

#include <errno.h>
#include <cmath>
#include <string>

#include "include/types.h"
#include "include/health.h"
#include "msg/Messenger.h"

#include "common/Timer.h"

#include "health_check.h"
#include "MonMap.h"
#include "Elector.h"
#include "Paxos.h"
#include "Session.h"
#include "MonCommand.h"


#include "common/cmdparse.h"
#include "common/config_obs.h"
#include "common/LogClient.h"
#include "auth/AuthClient.h"
#include "auth/AuthServer.h"
#include "auth/cephx/CephxKeyServer.h"
#include "auth/AuthMethodList.h"
#include "auth/KeyRing.h"
#include "messages/MMonCommand.h"
#include "mon/MonitorDBStore.h"
#include "mgr/MgrClient.h"

#include "mon/MonOpRequest.h"
#include "common/WorkQueue.h"


#define CEPH_MON_PROTOCOL     13 /* cluster internal */


enum {
  l_cluster_first = 555000,
  l_cluster_num_mon,
  l_cluster_num_mon_quorum,
  l_cluster_num_osd,
  l_cluster_num_osd_up,
  l_cluster_num_osd_in,
  l_cluster_osd_epoch,
  l_cluster_osd_bytes,
  l_cluster_osd_bytes_used,
  l_cluster_osd_bytes_avail,
  l_cluster_num_pool,
  l_cluster_num_pg,
  l_cluster_num_pg_active_clean,
  l_cluster_num_pg_active,
  l_cluster_num_pg_peering,
  l_cluster_num_object,
  l_cluster_num_object_degraded,
  l_cluster_num_object_misplaced,
  l_cluster_num_object_unfound,
  l_cluster_num_bytes,
  l_cluster_last,
};

enum {
  l_mon_first = 456000,
  l_mon_num_sessions,
  l_mon_session_add,
  l_mon_session_rm,
  l_mon_session_trim,
  l_mon_num_elections,
  l_mon_election_call,
  l_mon_election_win,
  l_mon_election_lose,
  l_mon_last,
};

class QuorumService;
class PaxosService;

class PerfCounters;
class AdminSocketHook;

#define COMPAT_SET_LOC "feature_set"

class C_MonContext final : public FunctionContext {
  const Monitor *mon;
public:
  explicit C_MonContext(Monitor *m, boost::function<void(int)>&& callback)
    : FunctionContext(std::move(callback)), mon(m) {}
  void finish(int r) override;
};

class Monitor : public Dispatcher,
		public AuthClient,
		public AuthServer,
                public md_config_obs_t {
public:
  int orig_argc = 0;
  const char **orig_argv = nullptr;

  // me
  string name;
  int rank;
  Messenger *messenger;
  ConnectionRef con_self;
  Mutex lock;
  SafeTimer timer;
  Finisher finisher;
  ThreadPool cpu_tp;  ///< threadpool for CPU intensive work

  ceph::mutex auth_lock = ceph::make_mutex("Monitor::auth_lock");

  /// true if we have ever joined a quorum.  if false, we are either a
  /// new cluster, a newly joining monitor, or a just-upgraded
  /// monitor.
  bool has_ever_joined;

  PerfCounters *logger, *cluster_logger;
  bool cluster_logger_registered;

  void register_cluster_logger();
  void unregister_cluster_logger();

  MonMap *monmap;
  uuid_d fingerprint;

  set<entity_addrvec_t> extra_probe_peers;

  LogClient log_client;
  LogChannelRef clog;
  LogChannelRef audit_clog;
  KeyRing keyring;
  KeyServer key_server;

  AuthMethodList auth_cluster_required;
  AuthMethodList auth_service_required;

  CompatSet features;

  vector<MonCommand> leader_mon_commands; // quorum leader's commands
  vector<MonCommand> local_mon_commands;  // commands i support
  bufferlist local_mon_commands_bl;       // encoded version of above

  vector<MonCommand> prenautilus_local_mon_commands;
  bufferlist prenautilus_local_mon_commands_bl;

  Messenger *mgr_messenger;
  MgrClient mgr_client;
  uint64_t mgr_proxy_bytes = 0;  // in-flight proxied mgr command message bytes
  std::string gss_ktfile_client{};

private:
  void new_tick();

  // -- local storage --
public:
  MonitorDBStore *store;
  static const string MONITOR_NAME;
  static const string MONITOR_STORE_PREFIX;

  // -- monitor state --
private:
  enum {
    STATE_INIT = 1,
    STATE_PROBING,
    STATE_SYNCHRONIZING,
    STATE_ELECTING,
    STATE_LEADER,
    STATE_PEON,
    STATE_SHUTDOWN
  };
  int state = STATE_INIT;

public:
  static const char *get_state_name(int s) {
    switch (s) {
    case STATE_PROBING: return "probing";
    case STATE_SYNCHRONIZING: return "synchronizing";
    case STATE_ELECTING: return "electing";
    case STATE_LEADER: return "leader";
    case STATE_PEON: return "peon";
    case STATE_SHUTDOWN: return "shutdown";
    default: return "???";
    }
  }
  const char *get_state_name() const {
    return get_state_name(state);
  }

  bool is_init() const { return state == STATE_INIT; }
  bool is_shutdown() const { return state == STATE_SHUTDOWN; }
  bool is_probing() const { return state == STATE_PROBING; }
  bool is_synchronizing() const { return state == STATE_SYNCHRONIZING; }
  bool is_electing() const { return state == STATE_ELECTING; }
  bool is_leader() const { return state == STATE_LEADER; }
  bool is_peon() const { return state == STATE_PEON; }

  const utime_t &get_leader_since() const;

  void prepare_new_fingerprint(MonitorDBStore::TransactionRef t);

  std::vector<DaemonHealthMetric> get_health_metrics();

  // -- elector --
private:
  Paxos *paxos;
  Elector elector;
  friend class Elector;

  /// features we require of peers (based on on-disk compatset)
  uint64_t required_features;
  
  int leader;            // current leader (to best of knowledge)
  set<int> quorum;       // current active set of monitors (if !starting)
  mono_clock::time_point quorum_since;  // when quorum formed
  utime_t leader_since;  // when this monitor became the leader, if it is the leader
  utime_t exited_quorum; // time detected as not in quorum; 0 if in

  // map of counts of connected clients, by type and features, for
  // each quorum mon
  map<int,FeatureMap> quorum_feature_map;

  /**
   * Intersection of quorum member's connection feature bits.
   */
  uint64_t quorum_con_features;
  /**
   * Intersection of quorum members mon-specific feature bits
   */
  mon_feature_t quorum_mon_features;

  int quorum_min_mon_release = -1;

  set<string> outside_quorum;

  /**
   * @defgroup Monitor_h_scrub
   * @{
   */
  version_t scrub_version;            ///< paxos version we are scrubbing
  map<int,ScrubResult> scrub_result;  ///< results so far

  /**
   * trigger a cross-mon scrub
   *
   * Verify all mons are storing identical content
   */
  int scrub_start();
  int scrub();
  void handle_scrub(MonOpRequestRef op);
  bool _scrub(ScrubResult *r,
              pair<string,string> *start,
              int *num_keys);
  void scrub_check_results();
  void scrub_timeout();
  void scrub_finish();
  void scrub_reset();
  void scrub_update_interval(int secs);

  Context *scrub_event;       ///< periodic event to trigger scrub (leader)
  Context *scrub_timeout_event;  ///< scrub round timeout (leader)
  void scrub_event_start();
  void scrub_event_cancel();
  void scrub_reset_timeout();
  void scrub_cancel_timeout();

  struct ScrubState {
    pair<string,string> last_key; ///< last scrubbed key
    bool finished;

    ScrubState() : finished(false) { }
    virtual ~ScrubState() { }
  };
  std::shared_ptr<ScrubState> scrub_state; ///< keeps track of current scrub

  /**
   * @defgroup Monitor_h_sync Synchronization
   * @{
   */
  /**
   * @} // provider state
   */
  struct SyncProvider {
    entity_addrvec_t addrs;
    uint64_t cookie;       ///< unique cookie for this sync attempt
    utime_t timeout;       ///< when we give up and expire this attempt
    version_t last_committed; ///< last paxos version on peer
    pair<string,string> last_key; ///< last key sent to (or on) peer
    bool full;             ///< full scan?
    MonitorDBStore::Synchronizer synchronizer;   ///< iterator

    SyncProvider() : cookie(0), last_committed(0), full(false) {}

    void reset_timeout(CephContext *cct, int grace) {
      timeout = ceph_clock_now();
      timeout += grace;
    }
  };

  map<uint64_t, SyncProvider> sync_providers;  ///< cookie -> SyncProvider for those syncing from us
  uint64_t sync_provider_count;   ///< counter for issued cookies to keep them unique

  /**
   * @} // requester state
   */
  entity_addrvec_t sync_provider;  ///< who we are syncing from
  uint64_t sync_cookie;          ///< 0 if we are starting, non-zero otherwise
  bool sync_full;                ///< true if we are a full sync, false for recent catch-up
  version_t sync_start_version;  ///< last_committed at sync start
  Context *sync_timeout_event;   ///< timeout event

  /**
   * floor for sync source
   *
   * When we sync we forget about our old last_committed value which
   * can be dangerous.  For example, if we have a cluster of:
   *
   *   mon.a: lc 100
   *   mon.b: lc 80
   *   mon.c: lc 100 (us)
   *
   * If something forces us to sync (say, corruption, or manual
   * intervention, or bug), we forget last_committed, and might abort.
   * If mon.a happens to be down when we come back, we will see:
   *
   *   mon.b: lc 80
   *   mon.c: lc 0 (us)
   *
   * and sync from mon.b, at which point a+b will both have lc 80 and
   * come online with a majority holding out of date commits.
   *
   * Avoid this by preserving our old last_committed value prior to
   * sync and never going backwards.
   */
  version_t sync_last_committed_floor;

  /**
   * Obtain the synchronization target prefixes in set form.
   *
   * We consider a target prefix all those that are relevant when
   * synchronizing two stores. That is, all those that hold paxos service's
   * versions, as well as paxos versions, or any control keys such as the
   * first or last committed version.
   *
   * Given the current design, this function should return the name of all and
   * any available paxos service, plus the paxos name.
   *
   * @returns a set of strings referring to the prefixes being synchronized
   */
  set<string> get_sync_targets_names();

  /**
   * Reset the monitor's sync-related data structures for syncing *from* a peer
   */
  void sync_reset_requester();

  /**
   * Reset sync state related to allowing others to sync from us
   */
  void sync_reset_provider();

  /**
   * Caled when a sync attempt times out (requester-side)
   */
  void sync_timeout();

  /**
   * Get the latest monmap for backup purposes during sync
   */
  void sync_obtain_latest_monmap(bufferlist &bl);

  /**
   * Start sync process
   *
   * Start pulling committed state from another monitor.
   *
   * @param entity where to pull committed state from
   * @param full whether to do a full sync or just catch up on recent paxos
   */
  void sync_start(entity_addrvec_t &addrs, bool full);

public:
  /**
   * force a sync on next mon restart
   */
  void sync_force(Formatter *f, ostream& ss);

private:
  /**
   * store critical state for safekeeping during sync
   *
   * We store a few things on the side that we don't want to get clobbered by sync.  This
   * includes the latest monmap and a lower bound on last_committed.
   */
  void sync_stash_critical_state(MonitorDBStore::TransactionRef tx);

  /**
   * reset the sync timeout
   *
   * This is used on the client to restart if things aren't progressing
   */
  void sync_reset_timeout();

  /**
   * trim stale sync provider state
   *
   * If someone is syncing from us and hasn't talked to us recently, expire their state.
   */
  void sync_trim_providers();

  /**
   * Complete a sync
   *
   * Finish up a sync after we've gotten all of the chunks.
   *
   * @param last_committed final last_committed value from provider
   */
  void sync_finish(version_t last_committed);

  /**
   * request the next chunk from the provider
   */
  void sync_get_next_chunk();

  /**
   * handle sync message
   *
   * @param m Sync message with operation type MMonSync::OP_START_CHUNKS
   */
  void handle_sync(MonOpRequestRef op);

  void _sync_reply_no_cookie(MonOpRequestRef op);

  void handle_sync_get_cookie(MonOpRequestRef op);
  void handle_sync_get_chunk(MonOpRequestRef op);
  void handle_sync_finish(MonOpRequestRef op);

  void handle_sync_cookie(MonOpRequestRef op);
  void handle_sync_forward(MonOpRequestRef op);
  void handle_sync_chunk(MonOpRequestRef op);
  void handle_sync_no_cookie(MonOpRequestRef op);

  /**
   * @} // Synchronization
   */

  list<Context*> waitfor_quorum;
  list<Context*> maybe_wait_for_quorum;

  /**
   * @defgroup Monitor_h_TimeCheck Monitor Clock Drift Early Warning System
   * @{
   *
   * We use time checks to keep track of any clock drifting going on in the
   * cluster. This is accomplished by periodically ping each monitor in the
   * quorum and register its response time on a map, assessing how much its
   * clock has drifted. We also take this opportunity to assess the latency
   * on response.
   *
   * This mechanism works as follows:
   *
   *  - Leader sends out a 'PING' message to each other monitor in the quorum.
   *    The message is timestamped with the leader's current time. The leader's
   *    current time is recorded in a map, associated with each peon's
   *    instance.
   *  - The peon replies to the leader with a timestamped 'PONG' message.
   *  - The leader calculates a delta between the peon's timestamp and its
   *    current time and stashes it.
   *  - The leader also calculates the time it took to receive the 'PONG'
   *    since the 'PING' was sent, and stashes an approximate latency estimate.
   *  - Once all the quorum members have pong'ed, the leader will share the
   *    clock skew and latency maps with all the monitors in the quorum.
   */
  map<int, utime_t> timecheck_waiting;
  map<int, double> timecheck_skews;
  map<int, double> timecheck_latencies;
  // odd value means we are mid-round; even value means the round has
  // finished.
  version_t timecheck_round;
  unsigned int timecheck_acks;
  utime_t timecheck_round_start;
  friend class HealthMonitor;
  /* When we hit a skew we will start a new round based off of
   * 'mon_timecheck_skew_interval'. Each new round will be backed off
   * until we hit 'mon_timecheck_interval' -- which is the typical
   * interval when not in the presence of a skew.
   *
   * This variable tracks the number of rounds with skews since last clean
   * so that we can report to the user and properly adjust the backoff.
   */
  uint64_t timecheck_rounds_since_clean;
  /**
   * Time Check event.
   */
  Context *timecheck_event;

  void timecheck_start();
  void timecheck_finish();
  void timecheck_start_round();
  void timecheck_finish_round(bool success = true);
  void timecheck_cancel_round();
  void timecheck_cleanup();
  void timecheck_reset_event();
  void timecheck_check_skews();
  void timecheck_report();
  void timecheck();
  health_status_t timecheck_status(ostringstream &ss,
                                   const double skew_bound,
                                   const double latency);
  void handle_timecheck_leader(MonOpRequestRef op);
  void handle_timecheck_peon(MonOpRequestRef op);
  void handle_timecheck(MonOpRequestRef op);

  /**
   * Returns 'true' if this is considered to be a skew; 'false' otherwise.
   */
  bool timecheck_has_skew(const double skew_bound, double *abs) const {
    double abs_skew = std::fabs(skew_bound);
    if (abs)
      *abs = abs_skew;
    return (abs_skew > g_conf()->mon_clock_drift_allowed);
  }

  /**
   * @}
   */
  /**
   * Handle ping messages from others.
   */
  void handle_ping(MonOpRequestRef op);

  Context *probe_timeout_event = nullptr;  // for probing

  void reset_probe_timeout();
  void cancel_probe_timeout();
  void probe_timeout(int r);

  void _apply_compatset_features(CompatSet &new_features);

public:
  epoch_t get_epoch();
  int get_leader() const { return leader; }
  string get_leader_name() {
    return quorum.empty() ? string() : monmap->get_name(*quorum.begin());
  }
  const set<int>& get_quorum() const { return quorum; }
  list<string> get_quorum_names() {
    list<string> q;
    for (set<int>::iterator p = quorum.begin(); p != quorum.end(); ++p)
      q.push_back(monmap->get_name(*p));
    return q;
  }
  uint64_t get_quorum_con_features() const {
    return quorum_con_features;
  }
  mon_feature_t get_quorum_mon_features() const {
    return quorum_mon_features;
  }
  uint64_t get_required_features() const {
    return required_features;
  }
  mon_feature_t get_required_mon_features() const {
    return monmap->get_required_features();
  }
  void apply_quorum_to_compatset_features();
  void apply_monmap_to_compatset_features();
  void calc_quorum_requirements();

  void get_combined_feature_map(FeatureMap *fm);

private:
  void _reset();   ///< called from bootstrap, start_, or join_election
  void wait_for_paxos_write();
  void _finish_svc_election(); ///< called by {win,lose}_election
  void respawn();
public:
  void bootstrap();
  void join_election();
  void start_election();
  void win_standalone_election();
  // end election (called by Elector)
  void win_election(epoch_t epoch, set<int>& q,
		    uint64_t features,
                    const mon_feature_t& mon_features,
		    int min_mon_release,
		    const map<int,Metadata>& metadata);
  void lose_election(epoch_t epoch, set<int>& q, int l,
		     uint64_t features,
                     const mon_feature_t& mon_features,
		     int min_mon_release);
  // end election (called by Elector)
  void finish_election();

  void update_logger();

  /**
   * Vector holding the Services serviced by this Monitor.
   */
  vector<std::unique_ptr<PaxosService>> paxos_service;

  class MDSMonitor *mdsmon() {
    return (class MDSMonitor *)paxos_service[PAXOS_MDSMAP].get();
  }

  class MonmapMonitor *monmon() {
    return (class MonmapMonitor *)paxos_service[PAXOS_MONMAP].get();
  }

  class OSDMonitor *osdmon() {
    return (class OSDMonitor *)paxos_service[PAXOS_OSDMAP].get();
  }

  class AuthMonitor *authmon() {
    return (class AuthMonitor *)paxos_service[PAXOS_AUTH].get();
  }

  class LogMonitor *logmon() {
    return (class LogMonitor*) paxos_service[PAXOS_LOG].get();
  }

  class MgrMonitor *mgrmon() {
    return (class MgrMonitor*) paxos_service[PAXOS_MGR].get();
  }

  class MgrStatMonitor *mgrstatmon() {
    return (class MgrStatMonitor*) paxos_service[PAXOS_MGRSTAT].get();
  }

  class HealthMonitor *healthmon() {
    return (class HealthMonitor*) paxos_service[PAXOS_HEALTH].get();
  }

  class ConfigMonitor *configmon() {
    return (class ConfigMonitor*) paxos_service[PAXOS_CONFIG].get();
  }

  friend class Paxos;
  friend class OSDMonitor;
  friend class MDSMonitor;
  friend class MonmapMonitor;
  friend class LogMonitor;
  friend class ConfigKeyService;

  QuorumService *config_key_service;

  // -- sessions --
  MonSessionMap session_map;
  Mutex session_map_lock{"Monitor::session_map_lock"};
  AdminSocketHook *admin_hook;

  template<typename Func, typename...Args>
  void with_session_map(Func&& func) {
    std::lock_guard l(session_map_lock);
    std::forward<Func>(func)(session_map);
  }
  void send_latest_monmap(Connection *con);

  // messages
  void handle_get_version(MonOpRequestRef op);
  void handle_subscribe(MonOpRequestRef op);
  void handle_mon_get_map(MonOpRequestRef op);

  static void _generate_command_map(cmdmap_t& cmdmap,
                                    map<string,string> &param_str_map);
  static const MonCommand *_get_moncommand(
    const string &cmd_prefix,
    const vector<MonCommand>& cmds);
  bool _allowed_command(MonSession *s, const string& module,
			const string& prefix,
                        const cmdmap_t& cmdmap,
                        const map<string,string>& param_str_map,
                        const MonCommand *this_cmd);
  void get_mon_status(Formatter *f, ostream& ss);
  void _quorum_status(Formatter *f, ostream& ss);
  bool _add_bootstrap_peer_hint(std::string_view cmd, const cmdmap_t& cmdmap,
				std::ostream& ss);
  void handle_command(MonOpRequestRef op);
  void handle_route(MonOpRequestRef op);

  void handle_mon_metadata(MonOpRequestRef op);
  int get_mon_metadata(int mon, Formatter *f, ostream& err);
  int print_nodes(Formatter *f, ostream& err);

  // Accumulate metadata across calls to update_mon_metadata
  map<int, Metadata> mon_metadata;
  map<int, Metadata> pending_metadata;

  /**
   *
   */
  struct health_cache_t {
    health_status_t overall;
    string summary;

    void reset() {
      // health_status_t doesn't really have a NONE value and we're not
      // okay with setting something else (say, HEALTH_ERR).  so just
      // leave it be.
      summary.clear();
    }
  } health_status_cache;

  Context *health_tick_event = nullptr;
  Context *health_interval_event = nullptr;

  void health_tick_start();
  void health_tick_stop();
  utime_t health_interval_calc_next_update();
  void health_interval_start();
  void health_interval_stop();
  void health_events_cleanup();

  void health_to_clog_update_conf(const std::set<std::string> &changed);

  void do_health_to_clog_interval();
  void do_health_to_clog(bool force = false);

  health_status_t get_health_status(
    bool want_detail,
    Formatter *f,
    std::string *plain,
    const char *sep1 = " ",
    const char *sep2 = "; ");
  void log_health(
    const health_check_map_t& updated,
    const health_check_map_t& previous,
    MonitorDBStore::TransactionRef t);

protected:

  class HealthCheckLogStatus {
    public:
    health_status_t severity;
    std::string last_message;
    utime_t updated_at = 0;
    HealthCheckLogStatus(health_status_t severity_,
                         const std::string &last_message_,
                         utime_t updated_at_)
      : severity(severity_),
        last_message(last_message_),
        updated_at(updated_at_)
    {}
  };
  std::map<std::string, HealthCheckLogStatus> health_check_log_times;

public:

  void get_cluster_status(stringstream &ss, Formatter *f);

  void reply_command(MonOpRequestRef op, int rc, const string &rs, version_t version);
  void reply_command(MonOpRequestRef op, int rc, const string &rs, bufferlist& rdata, version_t version);


  void handle_probe(MonOpRequestRef op);
  /**
   * Handle a Probe Operation, replying with our name, quorum and known versions.
   *
   * We use the MMonProbe message class for anything and everything related with
   * Monitor probing. One of the operations relates directly with the probing
   * itself, in which we receive a probe request and to which we reply with
   * our name, our quorum and the known versions for each Paxos service. Thus the
   * redundant function name. This reply will obviously be sent to the one
   * probing/requesting these infos.
   *
   * @todo Add @pre and @post
   *
   * @param m A Probe message, with an operation of type Probe.
   */
  void handle_probe_probe(MonOpRequestRef op);
  void handle_probe_reply(MonOpRequestRef op);

  // request routing
  struct RoutedRequest {
    uint64_t tid;
    bufferlist request_bl;
    MonSession *session;
    ConnectionRef con;
    uint64_t con_features;
    MonOpRequestRef op;

    RoutedRequest() : tid(0), session(NULL), con_features(0) {}
    ~RoutedRequest() {
      if (session)
	session->put();
    }
  };
  uint64_t routed_request_tid;
  map<uint64_t, RoutedRequest*> routed_requests;
  
  void forward_request_leader(MonOpRequestRef op);
  void handle_forward(MonOpRequestRef op);
  void send_reply(MonOpRequestRef op, Message *reply);
  void no_reply(MonOpRequestRef op);
  void resend_routed_requests();
  void remove_session(MonSession *s);
  void remove_all_sessions();
  void waitlist_or_zap_client(MonOpRequestRef op);

  void send_mon_message(Message *m, int rank);

public:
  struct C_Command : public C_MonOp {
    Monitor *mon;
    int rc;
    string rs;
    bufferlist rdata;
    version_t version;
    C_Command(Monitor *_mm, MonOpRequestRef _op, int r, string s, version_t v) :
      C_MonOp(_op), mon(_mm), rc(r), rs(s), version(v){}
    C_Command(Monitor *_mm, MonOpRequestRef _op, int r, string s, bufferlist rd, version_t v) :
      C_MonOp(_op), mon(_mm), rc(r), rs(s), rdata(rd), version(v){}

    void _finish(int r) override {
      MMonCommand *m = static_cast<MMonCommand*>(op->get_req());
      if (r >= 0) {
        ostringstream ss;
        if (!op->get_req()->get_connection()) {
          ss << "connection dropped for command ";
        } else {
          MonSession *s = op->get_session();

          // if client drops we may not have a session to draw information from.
          if (s) {
            ss << "from='" << s->name << " " << s->addrs << "' "
              << "entity='" << s->entity_name << "' ";
          } else {
            ss << "session dropped for command ";
          }
        }
        cmdmap_t cmdmap;
        stringstream ds;
        string prefix;
        cmdmap_from_json(m->cmd, &cmdmap, ds);
        cmd_getval(g_ceph_context, cmdmap, "prefix", prefix);
        if (prefix != "config set" && prefix != "config-key set")
          ss << "cmd='" << m->cmd << "': finished";

        mon->audit_clog->info() << ss.str();
	mon->reply_command(op, rc, rs, rdata, version);
      }
      else if (r == -ECANCELED)
        return;
      else if (r == -EAGAIN)
	mon->dispatch_op(op);
      else
	ceph_abort_msg("bad C_Command return value");
    }
  };

 private:
  class C_RetryMessage : public C_MonOp {
    Monitor *mon;
  public:
    C_RetryMessage(Monitor *m, MonOpRequestRef op) :
      C_MonOp(op), mon(m) { }

    void _finish(int r) override {
      if (r == -EAGAIN || r >= 0)
        mon->dispatch_op(op);
      else if (r == -ECANCELED)
        return;
      else
	ceph_abort_msg("bad C_RetryMessage return value");
    }
  };

  //ms_dispatch handles a lot of logic and we want to reuse it
  //on forwarded messages, so we create a non-locking version for this class
  void _ms_dispatch(Message *m);
  bool ms_dispatch(Message *m) override {
    lock.Lock();
    _ms_dispatch(m);
    lock.Unlock();
    return true;
  }
  void dispatch_op(MonOpRequestRef op);
  //mon_caps is used for un-connected messages from monitors
  MonCap mon_caps;
  bool ms_get_authorizer(int dest_type, AuthAuthorizer **authorizer) override;
  KeyStore *ms_get_auth1_authorizer_keystore();
public: // for AuthMonitor msgr1:
  int ms_handle_authentication(Connection *con) override;
private:
  void ms_handle_accept(Connection *con) override;
  bool ms_handle_reset(Connection *con) override;
  void ms_handle_remote_reset(Connection *con) override {}
  bool ms_handle_refused(Connection *con) override;

  // AuthClient
  int get_auth_request(
    Connection *con,
    AuthConnectionMeta *auth_meta,
    uint32_t *method,
    vector<uint32_t> *preferred_modes,
    bufferlist *out) override;
  int handle_auth_reply_more(
    Connection *con,
    AuthConnectionMeta *auth_meta,
   const bufferlist& bl,
    bufferlist *reply) override;
  int handle_auth_done(
    Connection *con,
    AuthConnectionMeta *auth_meta,
    uint64_t global_id,
    uint32_t con_mode,
    const bufferlist& bl,
    CryptoKey *session_key,
    std::string *connection_secret) override;
  int handle_auth_bad_method(
    Connection *con,
    AuthConnectionMeta *auth_meta,
    uint32_t old_auth_method,
    int result,
    const std::vector<uint32_t>& allowed_methods,
    const std::vector<uint32_t>& allowed_modes) override;
  // /AuthClient
  // AuthServer
  int handle_auth_request(
    Connection *con,
    AuthConnectionMeta *auth_meta,
    bool more,
    uint32_t auth_method,
    const bufferlist& bl,
    bufferlist *reply) override;
  // /AuthServer

  int write_default_keyring(bufferlist& bl);
  void extract_save_mon_key(KeyRing& keyring);

  void collect_metadata(Metadata *m);
  void update_mon_metadata(int from, Metadata&& m);
  int load_metadata();
  void count_metadata(const string& field, Formatter *f);
  void count_metadata(const string& field, map<string,int> *out);

  // features
  static CompatSet get_initial_supported_features();
  static CompatSet get_supported_features();
  static CompatSet get_legacy_features();
  /// read the ondisk features into the CompatSet pointed to by read_features
  static void read_features_off_disk(MonitorDBStore *store, CompatSet *read_features);
  void read_features();
  void write_features(MonitorDBStore::TransactionRef t);

  OpTracker op_tracker;

 public:
  Monitor(CephContext *cct_, string nm, MonitorDBStore *s,
	  Messenger *m, Messenger *mgr_m, MonMap *map);
  ~Monitor() override;

  static int check_features(MonitorDBStore *store);

  // config observer
  const char** get_tracked_conf_keys() const override;
  void handle_conf_change(const ConfigProxy& conf,
                          const std::set<std::string> &changed) override;

  void update_log_clients();
  int sanitize_options();
  int preinit();
  int init();
  void init_paxos();
  void refresh_from_paxos(bool *need_bootstrap);
  void shutdown();
  void tick();

  void handle_signal(int sig);

  int mkfs(bufferlist& osdmapbl);

  /**
   * check cluster_fsid file
   *
   * @return EEXIST if file exists and doesn't match, 0 on match, or negative error code
   */
  int check_fsid();

  /**
   * write cluster_fsid file
   *
   * @return 0 on success, or negative error code
   */
  int write_fsid();
  int write_fsid(MonitorDBStore::TransactionRef t);

  void do_admin_command(std::string_view command, const cmdmap_t& cmdmap,
			std::string_view format, std::ostream& ss);

private:
  // don't allow copying
  Monitor(const Monitor& rhs);
  Monitor& operator=(const Monitor &rhs);

public:
  static void format_command_descriptions(const std::vector<MonCommand> &commands,
					  Formatter *f,
					  uint64_t features,
					  bufferlist *rdata);

  const std::vector<MonCommand> &get_local_commands(mon_feature_t f) {
    if (f.contains_all(ceph::features::mon::FEATURE_NAUTILUS)) {
      return local_mon_commands;
    } else {
      return prenautilus_local_mon_commands;
    }
  }
  const bufferlist& get_local_commands_bl(mon_feature_t f) {
    if (f.contains_all(ceph::features::mon::FEATURE_NAUTILUS)) {
      return local_mon_commands_bl;
    } else {
      return prenautilus_local_mon_commands_bl;
    }
  }
  void set_leader_commands(const std::vector<MonCommand>& cmds) {
    leader_mon_commands = cmds;
  }

  bool is_keyring_required();
};

#define CEPH_MON_FEATURE_INCOMPAT_BASE CompatSet::Feature (1, "initial feature set (~v.18)")
#define CEPH_MON_FEATURE_INCOMPAT_GV CompatSet::Feature (2, "global version sequencing (v0.52)")
#define CEPH_MON_FEATURE_INCOMPAT_SINGLE_PAXOS CompatSet::Feature (3, "single paxos with k/v store (v0.\?)")
#define CEPH_MON_FEATURE_INCOMPAT_OSD_ERASURE_CODES CompatSet::Feature(4, "support erasure code pools")
#define CEPH_MON_FEATURE_INCOMPAT_OSDMAP_ENC CompatSet::Feature(5, "new-style osdmap encoding")
#define CEPH_MON_FEATURE_INCOMPAT_ERASURE_CODE_PLUGINS_V2 CompatSet::Feature(6, "support isa/lrc erasure code")
#define CEPH_MON_FEATURE_INCOMPAT_ERASURE_CODE_PLUGINS_V3 CompatSet::Feature(7, "support shec erasure code")
#define CEPH_MON_FEATURE_INCOMPAT_KRAKEN CompatSet::Feature(8, "support monmap features")
#define CEPH_MON_FEATURE_INCOMPAT_LUMINOUS CompatSet::Feature(9, "luminous ondisk layout")
#define CEPH_MON_FEATURE_INCOMPAT_MIMIC CompatSet::Feature(10, "mimic ondisk layout")
#define CEPH_MON_FEATURE_INCOMPAT_NAUTILUS CompatSet::Feature(11, "nautilus ondisk layout")
// make sure you add your feature to Monitor::get_supported_features



#endif