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1 | // -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- |
2 | // vim: ts=8 sw=2 smarttab | |
3 | /* | |
4 | * Ceph - scalable distributed file system | |
5 | * | |
6 | * Copyright (C) 2015 Red Hat | |
7 | * | |
8 | * This is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU Lesser General Public | |
10 | * License version 2.1, as published by the Free Software | |
11 | * Foundation. See file COPYING. | |
12 | * | |
13 | */ | |
14 | ||
15 | #ifndef MDS_RANK_H_ | |
16 | #define MDS_RANK_H_ | |
17 | ||
18 | #include "common/DecayCounter.h" | |
19 | #include "common/LogClient.h" | |
20 | #include "common/Timer.h" | |
21 | #include "common/TrackedOp.h" | |
22 | ||
23 | #include "messages/MCommand.h" | |
24 | ||
25 | #include "Beacon.h" | |
26 | #include "DamageTable.h" | |
27 | #include "MDSMap.h" | |
28 | #include "SessionMap.h" | |
29 | #include "MDCache.h" | |
30 | #include "Migrator.h" | |
31 | #include "MDLog.h" | |
32 | #include "PurgeQueue.h" | |
33 | #include "osdc/Journaler.h" | |
34 | ||
35 | // Full .h import instead of forward declaration for PerfCounter, for the | |
36 | // benefit of those including this header and using MDSRank::logger | |
37 | #include "common/perf_counters.h" | |
38 | ||
39 | enum { | |
40 | l_mds_first = 2000, | |
41 | l_mds_request, | |
42 | l_mds_reply, | |
43 | l_mds_reply_latency, | |
44 | l_mds_forward, | |
45 | l_mds_dir_fetch, | |
46 | l_mds_dir_commit, | |
47 | l_mds_dir_split, | |
48 | l_mds_dir_merge, | |
49 | l_mds_inode_max, | |
50 | l_mds_inodes, | |
51 | l_mds_inodes_top, | |
52 | l_mds_inodes_bottom, | |
53 | l_mds_inodes_pin_tail, | |
54 | l_mds_inodes_pinned, | |
55 | l_mds_inodes_expired, | |
56 | l_mds_inodes_with_caps, | |
57 | l_mds_caps, | |
58 | l_mds_subtrees, | |
59 | l_mds_traverse, | |
60 | l_mds_traverse_hit, | |
61 | l_mds_traverse_forward, | |
62 | l_mds_traverse_discover, | |
63 | l_mds_traverse_dir_fetch, | |
64 | l_mds_traverse_remote_ino, | |
65 | l_mds_traverse_lock, | |
66 | l_mds_load_cent, | |
67 | l_mds_dispatch_queue_len, | |
68 | l_mds_exported, | |
69 | l_mds_exported_inodes, | |
70 | l_mds_imported, | |
71 | l_mds_imported_inodes, | |
72 | l_mds_last, | |
73 | }; | |
74 | ||
75 | // memory utilization | |
76 | enum { | |
77 | l_mdm_first = 2500, | |
78 | l_mdm_ino, | |
79 | l_mdm_inoa, | |
80 | l_mdm_inos, | |
81 | l_mdm_dir, | |
82 | l_mdm_dira, | |
83 | l_mdm_dirs, | |
84 | l_mdm_dn, | |
85 | l_mdm_dna, | |
86 | l_mdm_dns, | |
87 | l_mdm_cap, | |
88 | l_mdm_capa, | |
89 | l_mdm_caps, | |
90 | l_mdm_rss, | |
91 | l_mdm_heap, | |
92 | l_mdm_buf, | |
93 | l_mdm_last, | |
94 | }; | |
95 | ||
96 | namespace ceph { | |
97 | struct heartbeat_handle_d; | |
98 | } | |
99 | ||
100 | class Server; | |
101 | class Locker; | |
102 | class MDCache; | |
103 | class MDLog; | |
104 | class MDBalancer; | |
105 | class InoTable; | |
106 | class SnapServer; | |
107 | class SnapClient; | |
108 | class MDSTableServer; | |
109 | class MDSTableClient; | |
110 | class Messenger; | |
111 | class Objecter; | |
112 | class MonClient; | |
113 | class Finisher; | |
114 | class MMDSMap; | |
115 | class ScrubStack; | |
116 | ||
117 | /** | |
118 | * The public part of this class's interface is what's exposed to all | |
119 | * the various subsystems (server, mdcache, etc), such as pointers | |
120 | * to the other subsystems, and message-sending calls. | |
121 | */ | |
122 | class MDSRank { | |
123 | protected: | |
124 | const mds_rank_t whoami; | |
125 | ||
126 | // Incarnation as seen in MDSMap at the point where a rank is | |
127 | // assigned. | |
128 | int incarnation; | |
129 | ||
130 | public: | |
131 | mds_rank_t get_nodeid() const { return whoami; } | |
132 | int64_t get_metadata_pool(); | |
133 | ||
134 | // Reference to global MDS::mds_lock, so that users of MDSRank don't | |
135 | // carry around references to the outer MDS, and we can substitute | |
136 | // a separate lock here in future potentially. | |
137 | Mutex &mds_lock; | |
138 | ||
b32b8144 FG |
139 | class CephContext *cct; |
140 | ||
7c673cae FG |
141 | bool is_daemon_stopping() const; |
142 | ||
143 | // Reference to global cluster log client, just to avoid initialising | |
144 | // a separate one here. | |
145 | LogChannelRef &clog; | |
146 | ||
147 | // Reference to global timer utility, because MDSRank and MDSDaemon | |
148 | // currently both use the same mds_lock, so it makes sense for them | |
149 | // to share a timer. | |
150 | SafeTimer &timer; | |
151 | ||
152 | MDSMap *&mdsmap; | |
153 | ||
154 | Objecter *objecter; | |
155 | ||
156 | // sub systems | |
157 | Server *server; | |
158 | MDCache *mdcache; | |
159 | Locker *locker; | |
160 | MDLog *mdlog; | |
161 | MDBalancer *balancer; | |
162 | ScrubStack *scrubstack; | |
163 | DamageTable damage_table; | |
164 | ||
165 | ||
166 | InoTable *inotable; | |
167 | ||
168 | SnapServer *snapserver; | |
169 | SnapClient *snapclient; | |
170 | ||
171 | MDSTableClient *get_table_client(int t); | |
172 | MDSTableServer *get_table_server(int t); | |
173 | ||
174 | SessionMap sessionmap; | |
175 | Session *get_session(client_t client) { | |
176 | return sessionmap.get_session(entity_name_t::CLIENT(client.v)); | |
177 | } | |
178 | ||
179 | PerfCounters *logger, *mlogger; | |
180 | OpTracker op_tracker; | |
181 | ||
182 | // The last different state I held before current | |
183 | MDSMap::DaemonState last_state; | |
184 | // The state assigned to me by the MDSMap | |
185 | MDSMap::DaemonState state; | |
186 | ||
187 | bool cluster_degraded; | |
188 | ||
189 | MDSMap::DaemonState get_state() const { return state; } | |
190 | MDSMap::DaemonState get_want_state() const { return beacon.get_want_state(); } | |
191 | ||
192 | bool is_creating() const { return state == MDSMap::STATE_CREATING; } | |
193 | bool is_starting() const { return state == MDSMap::STATE_STARTING; } | |
194 | bool is_standby() const { return state == MDSMap::STATE_STANDBY; } | |
195 | bool is_replay() const { return state == MDSMap::STATE_REPLAY; } | |
196 | bool is_standby_replay() const { return state == MDSMap::STATE_STANDBY_REPLAY; } | |
197 | bool is_resolve() const { return state == MDSMap::STATE_RESOLVE; } | |
198 | bool is_reconnect() const { return state == MDSMap::STATE_RECONNECT; } | |
199 | bool is_rejoin() const { return state == MDSMap::STATE_REJOIN; } | |
200 | bool is_clientreplay() const { return state == MDSMap::STATE_CLIENTREPLAY; } | |
201 | bool is_active() const { return state == MDSMap::STATE_ACTIVE; } | |
202 | bool is_stopping() const { return state == MDSMap::STATE_STOPPING; } | |
203 | bool is_any_replay() const { return (is_replay() || is_standby_replay()); } | |
204 | bool is_stopped() const { return mdsmap->is_stopped(whoami); } | |
205 | bool is_cluster_degraded() const { return cluster_degraded; } | |
206 | ||
207 | void handle_write_error(int err); | |
208 | ||
209 | void handle_conf_change(const struct md_config_t *conf, | |
210 | const std::set <std::string> &changed) | |
211 | { | |
212 | purge_queue.handle_conf_change(conf, changed, *mdsmap); | |
213 | } | |
214 | ||
c07f9fc5 | 215 | void update_mlogger(); |
7c673cae FG |
216 | protected: |
217 | // Flag to indicate we entered shutdown: anyone seeing this to be true | |
218 | // after taking mds_lock must drop out. | |
219 | bool stopping; | |
220 | ||
221 | // PurgeQueue is only used by StrayManager, but it is owned by MDSRank | |
222 | // because its init/shutdown happens at the top level. | |
223 | PurgeQueue purge_queue; | |
224 | ||
225 | class ProgressThread : public Thread { | |
226 | MDSRank *mds; | |
227 | Cond cond; | |
228 | public: | |
229 | explicit ProgressThread(MDSRank *mds_) : mds(mds_) {} | |
230 | void * entry() override; | |
231 | void shutdown(); | |
232 | void signal() {cond.Signal();} | |
233 | } progress_thread; | |
234 | ||
235 | list<Message*> waiting_for_nolaggy; | |
236 | list<MDSInternalContextBase*> finished_queue; | |
237 | // Dispatch, retry, queues | |
238 | int dispatch_depth; | |
239 | void inc_dispatch_depth() { ++dispatch_depth; } | |
240 | void dec_dispatch_depth() { --dispatch_depth; } | |
241 | void retry_dispatch(Message *m); | |
242 | bool handle_deferrable_message(Message *m); | |
243 | void _advance_queues(); | |
244 | bool _dispatch(Message *m, bool new_msg); | |
245 | ||
246 | ceph::heartbeat_handle_d *hb; // Heartbeat for threads using mds_lock | |
247 | ||
248 | bool is_stale_message(Message *m) const; | |
249 | ||
250 | map<mds_rank_t, version_t> peer_mdsmap_epoch; | |
251 | ||
252 | ceph_tid_t last_tid; // for mds-initiated requests (e.g. stray rename) | |
253 | ||
254 | list<MDSInternalContextBase*> waiting_for_active, waiting_for_replay, waiting_for_reconnect, waiting_for_resolve; | |
255 | list<MDSInternalContextBase*> replay_queue; | |
256 | map<mds_rank_t, list<MDSInternalContextBase*> > waiting_for_active_peer; | |
257 | map<epoch_t, list<MDSInternalContextBase*> > waiting_for_mdsmap; | |
258 | ||
259 | epoch_t osd_epoch_barrier; | |
260 | ||
261 | // Const reference to the beacon so that we can behave differently | |
262 | // when it's laggy. | |
263 | Beacon &beacon; | |
264 | ||
265 | /** | |
266 | * Emit clog warnings for any ops reported as warnings by optracker | |
267 | */ | |
268 | void check_ops_in_flight(); | |
269 | ||
270 | int mds_slow_req_count; | |
271 | ||
272 | /** | |
273 | * Share MDSMap with clients | |
274 | */ | |
275 | void bcast_mds_map(); // to mounted clients | |
276 | epoch_t last_client_mdsmap_bcast; | |
277 | ||
278 | map<mds_rank_t,DecayCounter> export_targets; /* targets this MDS is exporting to or wants/tries to */ | |
279 | ||
280 | void create_logger(); | |
281 | public: | |
282 | ||
283 | void queue_waiter(MDSInternalContextBase *c) { | |
284 | finished_queue.push_back(c); | |
285 | progress_thread.signal(); | |
286 | } | |
287 | void queue_waiters(list<MDSInternalContextBase*>& ls) { | |
288 | finished_queue.splice( finished_queue.end(), ls ); | |
289 | progress_thread.signal(); | |
290 | } | |
291 | ||
292 | MDSRank( | |
293 | mds_rank_t whoami_, | |
294 | Mutex &mds_lock_, | |
295 | LogChannelRef &clog_, | |
296 | SafeTimer &timer_, | |
297 | Beacon &beacon_, | |
298 | MDSMap *& mdsmap_, | |
299 | Messenger *msgr, | |
300 | MonClient *monc_, | |
301 | Context *respawn_hook_, | |
302 | Context *suicide_hook_); | |
303 | ||
304 | protected: | |
305 | ~MDSRank(); | |
306 | ||
307 | public: | |
308 | ||
309 | // Daemon lifetime functions: these guys break the abstraction | |
310 | // and call up into the parent MDSDaemon instance. It's kind | |
311 | // of unavoidable: if we want any depth into our calls | |
312 | // to be able to e.g. tear down the whole process, we have to | |
313 | // have a reference going all the way down. | |
314 | // >>> | |
315 | void suicide(); | |
316 | void respawn(); | |
317 | // <<< | |
318 | ||
319 | /** | |
320 | * Call this periodically if inside a potentially long running piece | |
321 | * of code while holding the mds_lock | |
322 | */ | |
323 | void heartbeat_reset(); | |
324 | ||
325 | /** | |
326 | * Report state DAMAGED to the mon, and then pass on to respawn(). Call | |
327 | * this when an unrecoverable error is encountered while attempting | |
328 | * to load an MDS rank's data structures. This is *not* for use with | |
329 | * errors affecting normal dirfrag/inode objects -- they should be handled | |
330 | * through cleaner scrub/repair mechanisms. | |
331 | * | |
332 | * Callers must already hold mds_lock. | |
333 | */ | |
334 | void damaged(); | |
335 | ||
336 | /** | |
337 | * Wrapper around `damaged` for users who are not | |
338 | * already holding mds_lock. | |
339 | * | |
340 | * Callers must not already hold mds_lock. | |
341 | */ | |
342 | void damaged_unlocked(); | |
343 | ||
344 | utime_t get_laggy_until() const; | |
345 | ||
346 | void send_message_mds(Message *m, mds_rank_t mds); | |
347 | void forward_message_mds(Message *req, mds_rank_t mds); | |
348 | ||
349 | void send_message_client_counted(Message *m, client_t client); | |
350 | void send_message_client_counted(Message *m, Session *session); | |
351 | void send_message_client_counted(Message *m, Connection *connection); | |
352 | void send_message_client_counted(Message *m, const ConnectionRef& con) { | |
353 | send_message_client_counted(m, con.get()); | |
354 | } | |
355 | void send_message_client(Message *m, Session *session); | |
356 | void send_message(Message *m, Connection *c); | |
357 | void send_message(Message *m, const ConnectionRef& c) { | |
358 | send_message(m, c.get()); | |
359 | } | |
360 | ||
361 | void wait_for_active_peer(mds_rank_t who, MDSInternalContextBase *c) { | |
362 | waiting_for_active_peer[who].push_back(c); | |
363 | } | |
364 | void wait_for_cluster_recovered(MDSInternalContextBase *c) { | |
365 | assert(cluster_degraded); | |
366 | waiting_for_active_peer[MDS_RANK_NONE].push_back(c); | |
367 | } | |
368 | ||
369 | void wait_for_active(MDSInternalContextBase *c) { | |
370 | waiting_for_active.push_back(c); | |
371 | } | |
372 | void wait_for_replay(MDSInternalContextBase *c) { | |
373 | waiting_for_replay.push_back(c); | |
374 | } | |
375 | void wait_for_reconnect(MDSInternalContextBase *c) { | |
376 | waiting_for_reconnect.push_back(c); | |
377 | } | |
378 | void wait_for_resolve(MDSInternalContextBase *c) { | |
379 | waiting_for_resolve.push_back(c); | |
380 | } | |
381 | void wait_for_mdsmap(epoch_t e, MDSInternalContextBase *c) { | |
382 | waiting_for_mdsmap[e].push_back(c); | |
383 | } | |
384 | void enqueue_replay(MDSInternalContextBase *c) { | |
385 | replay_queue.push_back(c); | |
386 | } | |
387 | ||
388 | bool queue_one_replay(); | |
389 | ||
390 | void set_osd_epoch_barrier(epoch_t e); | |
391 | epoch_t get_osd_epoch_barrier() const {return osd_epoch_barrier;} | |
392 | epoch_t get_osd_epoch() const; | |
393 | ||
394 | ceph_tid_t issue_tid() { return ++last_tid; } | |
395 | ||
396 | Finisher *finisher; | |
397 | ||
398 | MDSMap *get_mds_map() { return mdsmap; } | |
399 | ||
400 | int get_req_rate() const { return logger->get(l_mds_request); } | |
401 | ||
402 | int get_mds_slow_req_count() const { return mds_slow_req_count; } | |
403 | ||
404 | void dump_status(Formatter *f) const; | |
405 | ||
406 | void hit_export_target(utime_t now, mds_rank_t rank, double amount=-1.0); | |
407 | bool is_export_target(mds_rank_t rank) { | |
408 | const set<mds_rank_t>& map_targets = mdsmap->get_mds_info(get_nodeid()).export_targets; | |
409 | return map_targets.count(rank); | |
410 | } | |
411 | ||
31f18b77 FG |
412 | bool evict_client(int64_t session_id, bool wait, bool blacklist, |
413 | std::stringstream& ss, Context *on_killed=nullptr); | |
414 | ||
7c673cae FG |
415 | protected: |
416 | void dump_clientreplay_status(Formatter *f) const; | |
417 | void command_scrub_path(Formatter *f, const string& path, vector<string>& scrubop_vec); | |
418 | void command_tag_path(Formatter *f, const string& path, | |
419 | const string &tag); | |
420 | void command_flush_path(Formatter *f, const string& path); | |
421 | void command_flush_journal(Formatter *f); | |
422 | void command_get_subtrees(Formatter *f); | |
423 | void command_export_dir(Formatter *f, | |
424 | const std::string &path, mds_rank_t dest); | |
425 | bool command_dirfrag_split( | |
426 | cmdmap_t cmdmap, | |
427 | std::ostream &ss); | |
428 | bool command_dirfrag_merge( | |
429 | cmdmap_t cmdmap, | |
430 | std::ostream &ss); | |
431 | bool command_dirfrag_ls( | |
432 | cmdmap_t cmdmap, | |
433 | std::ostream &ss, | |
434 | Formatter *f); | |
435 | int _command_export_dir(const std::string &path, mds_rank_t dest); | |
436 | int _command_flush_journal(std::stringstream *ss); | |
437 | CDir *_command_dirfrag_get( | |
438 | const cmdmap_t &cmdmap, | |
439 | std::ostream &ss); | |
440 | ||
441 | protected: | |
442 | Messenger *messenger; | |
443 | MonClient *monc; | |
444 | ||
445 | Context *respawn_hook; | |
446 | Context *suicide_hook; | |
447 | ||
448 | // Friended to access retry_dispatch | |
449 | friend class C_MDS_RetryMessage; | |
450 | ||
451 | // FIXME the state machine logic should be separable from the dispatch | |
452 | // logic that calls it. | |
453 | // >>> | |
454 | void calc_recovery_set(); | |
455 | void request_state(MDSMap::DaemonState s); | |
456 | ||
457 | bool standby_replaying; // true if current replay pass is in standby-replay mode | |
458 | ||
459 | typedef enum { | |
460 | // The MDSMap is available, configure default layouts and structures | |
461 | MDS_BOOT_INITIAL = 0, | |
462 | // We are ready to open some inodes | |
463 | MDS_BOOT_OPEN_ROOT, | |
464 | // We are ready to do a replay if needed | |
465 | MDS_BOOT_PREPARE_LOG, | |
466 | // Replay is complete | |
467 | MDS_BOOT_REPLAY_DONE | |
468 | } BootStep; | |
469 | friend class C_MDS_BootStart; | |
470 | friend class C_MDS_InternalBootStart; | |
471 | void boot_create(); // i am new mds. | |
472 | void boot_start(BootStep step=MDS_BOOT_INITIAL, int r=0); // starting|replay | |
473 | ||
474 | void replay_start(); | |
475 | void creating_done(); | |
476 | void starting_done(); | |
477 | void replay_done(); | |
478 | void standby_replay_restart(); | |
479 | void _standby_replay_restart_finish(int r, uint64_t old_read_pos); | |
480 | class C_MDS_StandbyReplayRestart; | |
481 | class C_MDS_StandbyReplayRestartFinish; | |
482 | ||
483 | void reopen_log(); | |
484 | ||
485 | void resolve_start(); | |
486 | void resolve_done(); | |
487 | void reconnect_start(); | |
488 | void reconnect_done(); | |
489 | void rejoin_joint_start(); | |
490 | void rejoin_start(); | |
491 | void rejoin_done(); | |
492 | void recovery_done(int oldstate); | |
493 | void clientreplay_start(); | |
494 | void clientreplay_done(); | |
495 | void active_start(); | |
496 | void stopping_start(); | |
497 | void stopping_done(); | |
498 | ||
499 | void validate_sessions(); | |
500 | // <<< | |
501 | ||
502 | // >>> | |
503 | void handle_mds_recovery(mds_rank_t who); | |
504 | void handle_mds_failure(mds_rank_t who); | |
505 | // <<< | |
506 | ||
507 | /* Update MDSMap export_targets for this rank. Called on ::tick(). */ | |
508 | void update_targets(utime_t now); | |
509 | }; | |
510 | ||
511 | /* This expects to be given a reference which it is responsible for. | |
512 | * The finish function calls functions which | |
513 | * will put the Message exactly once.*/ | |
514 | class C_MDS_RetryMessage : public MDSInternalContext { | |
515 | protected: | |
516 | Message *m; | |
517 | public: | |
518 | C_MDS_RetryMessage(MDSRank *mds, Message *m) | |
519 | : MDSInternalContext(mds) | |
520 | { | |
521 | assert(m); | |
522 | this->m = m; | |
523 | } | |
524 | void finish(int r) override { | |
525 | mds->retry_dispatch(m); | |
526 | } | |
527 | }; | |
528 | ||
529 | /** | |
530 | * The aspect of MDSRank exposed to MDSDaemon but not subsystems: i.e. | |
531 | * the service/dispatcher stuff like init/shutdown that subsystems should | |
532 | * never touch. | |
533 | */ | |
534 | class MDSRankDispatcher : public MDSRank | |
535 | { | |
536 | public: | |
537 | void init(); | |
538 | void tick(); | |
539 | void shutdown(); | |
540 | bool handle_asok_command(std::string command, cmdmap_t& cmdmap, | |
541 | Formatter *f, std::ostream& ss); | |
542 | void handle_mds_map(MMDSMap *m, MDSMap *oldmap); | |
543 | void handle_osd_map(); | |
7c673cae FG |
544 | void update_log_config(); |
545 | ||
546 | bool handle_command( | |
547 | const cmdmap_t &cmdmap, | |
548 | MCommand *m, | |
549 | int *r, | |
550 | std::stringstream *ds, | |
551 | std::stringstream *ss, | |
552 | bool *need_reply); | |
553 | ||
554 | void dump_sessions(const SessionFilter &filter, Formatter *f) const; | |
31f18b77 | 555 | void evict_clients(const SessionFilter &filter, MCommand *m); |
7c673cae FG |
556 | |
557 | // Call into me from MDS::ms_dispatch | |
558 | bool ms_dispatch(Message *m); | |
559 | ||
560 | MDSRankDispatcher( | |
561 | mds_rank_t whoami_, | |
562 | Mutex &mds_lock_, | |
563 | LogChannelRef &clog_, | |
564 | SafeTimer &timer_, | |
565 | Beacon &beacon_, | |
566 | MDSMap *& mdsmap_, | |
567 | Messenger *msgr, | |
568 | MonClient *monc_, | |
569 | Context *respawn_hook_, | |
570 | Context *suicide_hook_); | |
571 | }; | |
572 | ||
573 | // This utility for MDS and MDSRank dispatchers. | |
574 | #define ALLOW_MESSAGES_FROM(peers) \ | |
575 | do { \ | |
576 | if (m->get_connection() && (m->get_connection()->get_peer_type() & (peers)) == 0) { \ | |
577 | dout(0) << __FILE__ << "." << __LINE__ << ": filtered out request, peer=" << m->get_connection()->get_peer_type() \ | |
578 | << " allowing=" << #peers << " message=" << *m << dendl; \ | |
579 | m->put(); \ | |
580 | return true; \ | |
581 | } \ | |
582 | } while (0) | |
583 | ||
584 | #endif // MDS_RANK_H_ | |
585 |