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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 | ||
139 | bool is_daemon_stopping() const; | |
140 | ||
141 | // Reference to global cluster log client, just to avoid initialising | |
142 | // a separate one here. | |
143 | LogChannelRef &clog; | |
144 | ||
145 | // Reference to global timer utility, because MDSRank and MDSDaemon | |
146 | // currently both use the same mds_lock, so it makes sense for them | |
147 | // to share a timer. | |
148 | SafeTimer &timer; | |
149 | ||
150 | MDSMap *&mdsmap; | |
151 | ||
152 | Objecter *objecter; | |
153 | ||
154 | // sub systems | |
155 | Server *server; | |
156 | MDCache *mdcache; | |
157 | Locker *locker; | |
158 | MDLog *mdlog; | |
159 | MDBalancer *balancer; | |
160 | ScrubStack *scrubstack; | |
161 | DamageTable damage_table; | |
162 | ||
163 | ||
164 | InoTable *inotable; | |
165 | ||
166 | SnapServer *snapserver; | |
167 | SnapClient *snapclient; | |
168 | ||
169 | MDSTableClient *get_table_client(int t); | |
170 | MDSTableServer *get_table_server(int t); | |
171 | ||
172 | SessionMap sessionmap; | |
173 | Session *get_session(client_t client) { | |
174 | return sessionmap.get_session(entity_name_t::CLIENT(client.v)); | |
175 | } | |
176 | ||
177 | PerfCounters *logger, *mlogger; | |
178 | OpTracker op_tracker; | |
179 | ||
180 | // The last different state I held before current | |
181 | MDSMap::DaemonState last_state; | |
182 | // The state assigned to me by the MDSMap | |
183 | MDSMap::DaemonState state; | |
184 | ||
185 | bool cluster_degraded; | |
186 | ||
187 | MDSMap::DaemonState get_state() const { return state; } | |
188 | MDSMap::DaemonState get_want_state() const { return beacon.get_want_state(); } | |
189 | ||
190 | bool is_creating() const { return state == MDSMap::STATE_CREATING; } | |
191 | bool is_starting() const { return state == MDSMap::STATE_STARTING; } | |
192 | bool is_standby() const { return state == MDSMap::STATE_STANDBY; } | |
193 | bool is_replay() const { return state == MDSMap::STATE_REPLAY; } | |
194 | bool is_standby_replay() const { return state == MDSMap::STATE_STANDBY_REPLAY; } | |
195 | bool is_resolve() const { return state == MDSMap::STATE_RESOLVE; } | |
196 | bool is_reconnect() const { return state == MDSMap::STATE_RECONNECT; } | |
197 | bool is_rejoin() const { return state == MDSMap::STATE_REJOIN; } | |
198 | bool is_clientreplay() const { return state == MDSMap::STATE_CLIENTREPLAY; } | |
199 | bool is_active() const { return state == MDSMap::STATE_ACTIVE; } | |
200 | bool is_stopping() const { return state == MDSMap::STATE_STOPPING; } | |
201 | bool is_any_replay() const { return (is_replay() || is_standby_replay()); } | |
202 | bool is_stopped() const { return mdsmap->is_stopped(whoami); } | |
203 | bool is_cluster_degraded() const { return cluster_degraded; } | |
204 | ||
205 | void handle_write_error(int err); | |
206 | ||
207 | void handle_conf_change(const struct md_config_t *conf, | |
208 | const std::set <std::string> &changed) | |
209 | { | |
210 | purge_queue.handle_conf_change(conf, changed, *mdsmap); | |
211 | } | |
212 | ||
213 | protected: | |
214 | // Flag to indicate we entered shutdown: anyone seeing this to be true | |
215 | // after taking mds_lock must drop out. | |
216 | bool stopping; | |
217 | ||
218 | // PurgeQueue is only used by StrayManager, but it is owned by MDSRank | |
219 | // because its init/shutdown happens at the top level. | |
220 | PurgeQueue purge_queue; | |
221 | ||
222 | class ProgressThread : public Thread { | |
223 | MDSRank *mds; | |
224 | Cond cond; | |
225 | public: | |
226 | explicit ProgressThread(MDSRank *mds_) : mds(mds_) {} | |
227 | void * entry() override; | |
228 | void shutdown(); | |
229 | void signal() {cond.Signal();} | |
230 | } progress_thread; | |
231 | ||
232 | list<Message*> waiting_for_nolaggy; | |
233 | list<MDSInternalContextBase*> finished_queue; | |
234 | // Dispatch, retry, queues | |
235 | int dispatch_depth; | |
236 | void inc_dispatch_depth() { ++dispatch_depth; } | |
237 | void dec_dispatch_depth() { --dispatch_depth; } | |
238 | void retry_dispatch(Message *m); | |
239 | bool handle_deferrable_message(Message *m); | |
240 | void _advance_queues(); | |
241 | bool _dispatch(Message *m, bool new_msg); | |
242 | ||
243 | ceph::heartbeat_handle_d *hb; // Heartbeat for threads using mds_lock | |
244 | ||
245 | bool is_stale_message(Message *m) const; | |
246 | ||
247 | map<mds_rank_t, version_t> peer_mdsmap_epoch; | |
248 | ||
249 | ceph_tid_t last_tid; // for mds-initiated requests (e.g. stray rename) | |
250 | ||
251 | list<MDSInternalContextBase*> waiting_for_active, waiting_for_replay, waiting_for_reconnect, waiting_for_resolve; | |
252 | list<MDSInternalContextBase*> replay_queue; | |
253 | map<mds_rank_t, list<MDSInternalContextBase*> > waiting_for_active_peer; | |
254 | map<epoch_t, list<MDSInternalContextBase*> > waiting_for_mdsmap; | |
255 | ||
256 | epoch_t osd_epoch_barrier; | |
257 | ||
258 | // Const reference to the beacon so that we can behave differently | |
259 | // when it's laggy. | |
260 | Beacon &beacon; | |
261 | ||
262 | /** | |
263 | * Emit clog warnings for any ops reported as warnings by optracker | |
264 | */ | |
265 | void check_ops_in_flight(); | |
266 | ||
267 | int mds_slow_req_count; | |
268 | ||
269 | /** | |
270 | * Share MDSMap with clients | |
271 | */ | |
272 | void bcast_mds_map(); // to mounted clients | |
273 | epoch_t last_client_mdsmap_bcast; | |
274 | ||
275 | map<mds_rank_t,DecayCounter> export_targets; /* targets this MDS is exporting to or wants/tries to */ | |
276 | ||
277 | void create_logger(); | |
278 | public: | |
279 | ||
280 | void queue_waiter(MDSInternalContextBase *c) { | |
281 | finished_queue.push_back(c); | |
282 | progress_thread.signal(); | |
283 | } | |
284 | void queue_waiters(list<MDSInternalContextBase*>& ls) { | |
285 | finished_queue.splice( finished_queue.end(), ls ); | |
286 | progress_thread.signal(); | |
287 | } | |
288 | ||
289 | MDSRank( | |
290 | mds_rank_t whoami_, | |
291 | Mutex &mds_lock_, | |
292 | LogChannelRef &clog_, | |
293 | SafeTimer &timer_, | |
294 | Beacon &beacon_, | |
295 | MDSMap *& mdsmap_, | |
296 | Messenger *msgr, | |
297 | MonClient *monc_, | |
298 | Context *respawn_hook_, | |
299 | Context *suicide_hook_); | |
300 | ||
301 | protected: | |
302 | ~MDSRank(); | |
303 | ||
304 | public: | |
305 | ||
306 | // Daemon lifetime functions: these guys break the abstraction | |
307 | // and call up into the parent MDSDaemon instance. It's kind | |
308 | // of unavoidable: if we want any depth into our calls | |
309 | // to be able to e.g. tear down the whole process, we have to | |
310 | // have a reference going all the way down. | |
311 | // >>> | |
312 | void suicide(); | |
313 | void respawn(); | |
314 | // <<< | |
315 | ||
316 | /** | |
317 | * Call this periodically if inside a potentially long running piece | |
318 | * of code while holding the mds_lock | |
319 | */ | |
320 | void heartbeat_reset(); | |
321 | ||
322 | /** | |
323 | * Report state DAMAGED to the mon, and then pass on to respawn(). Call | |
324 | * this when an unrecoverable error is encountered while attempting | |
325 | * to load an MDS rank's data structures. This is *not* for use with | |
326 | * errors affecting normal dirfrag/inode objects -- they should be handled | |
327 | * through cleaner scrub/repair mechanisms. | |
328 | * | |
329 | * Callers must already hold mds_lock. | |
330 | */ | |
331 | void damaged(); | |
332 | ||
333 | /** | |
334 | * Wrapper around `damaged` for users who are not | |
335 | * already holding mds_lock. | |
336 | * | |
337 | * Callers must not already hold mds_lock. | |
338 | */ | |
339 | void damaged_unlocked(); | |
340 | ||
341 | utime_t get_laggy_until() const; | |
342 | ||
343 | void send_message_mds(Message *m, mds_rank_t mds); | |
344 | void forward_message_mds(Message *req, mds_rank_t mds); | |
345 | ||
346 | void send_message_client_counted(Message *m, client_t client); | |
347 | void send_message_client_counted(Message *m, Session *session); | |
348 | void send_message_client_counted(Message *m, Connection *connection); | |
349 | void send_message_client_counted(Message *m, const ConnectionRef& con) { | |
350 | send_message_client_counted(m, con.get()); | |
351 | } | |
352 | void send_message_client(Message *m, Session *session); | |
353 | void send_message(Message *m, Connection *c); | |
354 | void send_message(Message *m, const ConnectionRef& c) { | |
355 | send_message(m, c.get()); | |
356 | } | |
357 | ||
358 | void wait_for_active_peer(mds_rank_t who, MDSInternalContextBase *c) { | |
359 | waiting_for_active_peer[who].push_back(c); | |
360 | } | |
361 | void wait_for_cluster_recovered(MDSInternalContextBase *c) { | |
362 | assert(cluster_degraded); | |
363 | waiting_for_active_peer[MDS_RANK_NONE].push_back(c); | |
364 | } | |
365 | ||
366 | void wait_for_active(MDSInternalContextBase *c) { | |
367 | waiting_for_active.push_back(c); | |
368 | } | |
369 | void wait_for_replay(MDSInternalContextBase *c) { | |
370 | waiting_for_replay.push_back(c); | |
371 | } | |
372 | void wait_for_reconnect(MDSInternalContextBase *c) { | |
373 | waiting_for_reconnect.push_back(c); | |
374 | } | |
375 | void wait_for_resolve(MDSInternalContextBase *c) { | |
376 | waiting_for_resolve.push_back(c); | |
377 | } | |
378 | void wait_for_mdsmap(epoch_t e, MDSInternalContextBase *c) { | |
379 | waiting_for_mdsmap[e].push_back(c); | |
380 | } | |
381 | void enqueue_replay(MDSInternalContextBase *c) { | |
382 | replay_queue.push_back(c); | |
383 | } | |
384 | ||
385 | bool queue_one_replay(); | |
386 | ||
387 | void set_osd_epoch_barrier(epoch_t e); | |
388 | epoch_t get_osd_epoch_barrier() const {return osd_epoch_barrier;} | |
389 | epoch_t get_osd_epoch() const; | |
390 | ||
391 | ceph_tid_t issue_tid() { return ++last_tid; } | |
392 | ||
393 | Finisher *finisher; | |
394 | ||
395 | MDSMap *get_mds_map() { return mdsmap; } | |
396 | ||
397 | int get_req_rate() const { return logger->get(l_mds_request); } | |
398 | ||
399 | int get_mds_slow_req_count() const { return mds_slow_req_count; } | |
400 | ||
401 | void dump_status(Formatter *f) const; | |
402 | ||
403 | void hit_export_target(utime_t now, mds_rank_t rank, double amount=-1.0); | |
404 | bool is_export_target(mds_rank_t rank) { | |
405 | const set<mds_rank_t>& map_targets = mdsmap->get_mds_info(get_nodeid()).export_targets; | |
406 | return map_targets.count(rank); | |
407 | } | |
408 | ||
31f18b77 FG |
409 | bool evict_client(int64_t session_id, bool wait, bool blacklist, |
410 | std::stringstream& ss, Context *on_killed=nullptr); | |
411 | ||
7c673cae FG |
412 | protected: |
413 | void dump_clientreplay_status(Formatter *f) const; | |
414 | void command_scrub_path(Formatter *f, const string& path, vector<string>& scrubop_vec); | |
415 | void command_tag_path(Formatter *f, const string& path, | |
416 | const string &tag); | |
417 | void command_flush_path(Formatter *f, const string& path); | |
418 | void command_flush_journal(Formatter *f); | |
419 | void command_get_subtrees(Formatter *f); | |
420 | void command_export_dir(Formatter *f, | |
421 | const std::string &path, mds_rank_t dest); | |
422 | bool command_dirfrag_split( | |
423 | cmdmap_t cmdmap, | |
424 | std::ostream &ss); | |
425 | bool command_dirfrag_merge( | |
426 | cmdmap_t cmdmap, | |
427 | std::ostream &ss); | |
428 | bool command_dirfrag_ls( | |
429 | cmdmap_t cmdmap, | |
430 | std::ostream &ss, | |
431 | Formatter *f); | |
432 | int _command_export_dir(const std::string &path, mds_rank_t dest); | |
433 | int _command_flush_journal(std::stringstream *ss); | |
434 | CDir *_command_dirfrag_get( | |
435 | const cmdmap_t &cmdmap, | |
436 | std::ostream &ss); | |
437 | ||
438 | protected: | |
439 | Messenger *messenger; | |
440 | MonClient *monc; | |
441 | ||
442 | Context *respawn_hook; | |
443 | Context *suicide_hook; | |
444 | ||
445 | // Friended to access retry_dispatch | |
446 | friend class C_MDS_RetryMessage; | |
447 | ||
448 | // FIXME the state machine logic should be separable from the dispatch | |
449 | // logic that calls it. | |
450 | // >>> | |
451 | void calc_recovery_set(); | |
452 | void request_state(MDSMap::DaemonState s); | |
453 | ||
454 | bool standby_replaying; // true if current replay pass is in standby-replay mode | |
455 | ||
456 | typedef enum { | |
457 | // The MDSMap is available, configure default layouts and structures | |
458 | MDS_BOOT_INITIAL = 0, | |
459 | // We are ready to open some inodes | |
460 | MDS_BOOT_OPEN_ROOT, | |
461 | // We are ready to do a replay if needed | |
462 | MDS_BOOT_PREPARE_LOG, | |
463 | // Replay is complete | |
464 | MDS_BOOT_REPLAY_DONE | |
465 | } BootStep; | |
466 | friend class C_MDS_BootStart; | |
467 | friend class C_MDS_InternalBootStart; | |
468 | void boot_create(); // i am new mds. | |
469 | void boot_start(BootStep step=MDS_BOOT_INITIAL, int r=0); // starting|replay | |
470 | ||
471 | void replay_start(); | |
472 | void creating_done(); | |
473 | void starting_done(); | |
474 | void replay_done(); | |
475 | void standby_replay_restart(); | |
476 | void _standby_replay_restart_finish(int r, uint64_t old_read_pos); | |
477 | class C_MDS_StandbyReplayRestart; | |
478 | class C_MDS_StandbyReplayRestartFinish; | |
479 | ||
480 | void reopen_log(); | |
481 | ||
482 | void resolve_start(); | |
483 | void resolve_done(); | |
484 | void reconnect_start(); | |
485 | void reconnect_done(); | |
486 | void rejoin_joint_start(); | |
487 | void rejoin_start(); | |
488 | void rejoin_done(); | |
489 | void recovery_done(int oldstate); | |
490 | void clientreplay_start(); | |
491 | void clientreplay_done(); | |
492 | void active_start(); | |
493 | void stopping_start(); | |
494 | void stopping_done(); | |
495 | ||
496 | void validate_sessions(); | |
497 | // <<< | |
498 | ||
499 | // >>> | |
500 | void handle_mds_recovery(mds_rank_t who); | |
501 | void handle_mds_failure(mds_rank_t who); | |
502 | // <<< | |
503 | ||
504 | /* Update MDSMap export_targets for this rank. Called on ::tick(). */ | |
505 | void update_targets(utime_t now); | |
506 | }; | |
507 | ||
508 | /* This expects to be given a reference which it is responsible for. | |
509 | * The finish function calls functions which | |
510 | * will put the Message exactly once.*/ | |
511 | class C_MDS_RetryMessage : public MDSInternalContext { | |
512 | protected: | |
513 | Message *m; | |
514 | public: | |
515 | C_MDS_RetryMessage(MDSRank *mds, Message *m) | |
516 | : MDSInternalContext(mds) | |
517 | { | |
518 | assert(m); | |
519 | this->m = m; | |
520 | } | |
521 | void finish(int r) override { | |
522 | mds->retry_dispatch(m); | |
523 | } | |
524 | }; | |
525 | ||
526 | /** | |
527 | * The aspect of MDSRank exposed to MDSDaemon but not subsystems: i.e. | |
528 | * the service/dispatcher stuff like init/shutdown that subsystems should | |
529 | * never touch. | |
530 | */ | |
531 | class MDSRankDispatcher : public MDSRank | |
532 | { | |
533 | public: | |
534 | void init(); | |
535 | void tick(); | |
536 | void shutdown(); | |
537 | bool handle_asok_command(std::string command, cmdmap_t& cmdmap, | |
538 | Formatter *f, std::ostream& ss); | |
539 | void handle_mds_map(MMDSMap *m, MDSMap *oldmap); | |
540 | void handle_osd_map(); | |
7c673cae FG |
541 | void update_log_config(); |
542 | ||
543 | bool handle_command( | |
544 | const cmdmap_t &cmdmap, | |
545 | MCommand *m, | |
546 | int *r, | |
547 | std::stringstream *ds, | |
548 | std::stringstream *ss, | |
549 | bool *need_reply); | |
550 | ||
551 | void dump_sessions(const SessionFilter &filter, Formatter *f) const; | |
31f18b77 | 552 | void evict_clients(const SessionFilter &filter, MCommand *m); |
7c673cae FG |
553 | |
554 | // Call into me from MDS::ms_dispatch | |
555 | bool ms_dispatch(Message *m); | |
556 | ||
557 | MDSRankDispatcher( | |
558 | mds_rank_t whoami_, | |
559 | Mutex &mds_lock_, | |
560 | LogChannelRef &clog_, | |
561 | SafeTimer &timer_, | |
562 | Beacon &beacon_, | |
563 | MDSMap *& mdsmap_, | |
564 | Messenger *msgr, | |
565 | MonClient *monc_, | |
566 | Context *respawn_hook_, | |
567 | Context *suicide_hook_); | |
568 | }; | |
569 | ||
570 | // This utility for MDS and MDSRank dispatchers. | |
571 | #define ALLOW_MESSAGES_FROM(peers) \ | |
572 | do { \ | |
573 | if (m->get_connection() && (m->get_connection()->get_peer_type() & (peers)) == 0) { \ | |
574 | dout(0) << __FILE__ << "." << __LINE__ << ": filtered out request, peer=" << m->get_connection()->get_peer_type() \ | |
575 | << " allowing=" << #peers << " message=" << *m << dendl; \ | |
576 | m->put(); \ | |
577 | return true; \ | |
578 | } \ | |
579 | } while (0) | |
580 | ||
581 | #endif // MDS_RANK_H_ | |
582 |