1 // -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
2 // vim: ts=8 sw=2 smarttab
4 * Ceph - scalable distributed file system
6 * Copyright (C) 2015 Red Hat
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.
18 #include "common/DecayCounter.h"
19 #include "common/LogClient.h"
20 #include "common/Timer.h"
21 #include "common/TrackedOp.h"
23 #include "messages/MCommand.h"
26 #include "DamageTable.h"
28 #include "SessionMap.h"
32 #include "PurgeQueue.h"
33 #include "osdc/Journaler.h"
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"
53 l_mds_inodes_pin_tail
,
56 l_mds_inodes_with_caps
,
61 l_mds_traverse_forward
,
62 l_mds_traverse_discover
,
63 l_mds_traverse_dir_fetch
,
64 l_mds_traverse_remote_ino
,
67 l_mds_dispatch_queue_len
,
69 l_mds_exported_inodes
,
71 l_mds_imported_inodes
,
97 struct heartbeat_handle_d
;
108 class MDSTableServer
;
109 class MDSTableClient
;
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.
124 const mds_rank_t whoami
;
126 // Incarnation as seen in MDSMap at the point where a rank is
131 mds_rank_t
get_nodeid() const { return whoami
; }
132 int64_t get_metadata_pool();
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.
139 bool is_daemon_stopping() const;
141 // Reference to global cluster log client, just to avoid initialising
142 // a separate one here.
145 // Reference to global timer utility, because MDSRank and MDSDaemon
146 // currently both use the same mds_lock, so it makes sense for them
159 MDBalancer
*balancer
;
160 ScrubStack
*scrubstack
;
161 DamageTable damage_table
;
166 SnapServer
*snapserver
;
167 SnapClient
*snapclient
;
169 MDSTableClient
*get_table_client(int t
);
170 MDSTableServer
*get_table_server(int t
);
172 SessionMap sessionmap
;
173 Session
*get_session(client_t client
) {
174 return sessionmap
.get_session(entity_name_t::CLIENT(client
.v
));
177 PerfCounters
*logger
, *mlogger
;
178 OpTracker op_tracker
;
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
;
185 bool cluster_degraded
;
187 MDSMap::DaemonState
get_state() const { return state
; }
188 MDSMap::DaemonState
get_want_state() const { return beacon
.get_want_state(); }
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
; }
205 void handle_write_error(int err
);
207 void handle_conf_change(const struct md_config_t
*conf
,
208 const std::set
<std::string
> &changed
)
210 purge_queue
.handle_conf_change(conf
, changed
, *mdsmap
);
214 // Flag to indicate we entered shutdown: anyone seeing this to be true
215 // after taking mds_lock must drop out.
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
;
222 class ProgressThread
: public Thread
{
226 explicit ProgressThread(MDSRank
*mds_
) : mds(mds_
) {}
227 void * entry() override
;
229 void signal() {cond
.Signal();}
232 list
<Message
*> waiting_for_nolaggy
;
233 list
<MDSInternalContextBase
*> finished_queue
;
234 // Dispatch, retry, queues
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
);
243 ceph::heartbeat_handle_d
*hb
; // Heartbeat for threads using mds_lock
245 bool is_stale_message(Message
*m
) const;
247 map
<mds_rank_t
, version_t
> peer_mdsmap_epoch
;
249 ceph_tid_t last_tid
; // for mds-initiated requests (e.g. stray rename)
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
;
256 epoch_t osd_epoch_barrier
;
258 // Const reference to the beacon so that we can behave differently
263 * Emit clog warnings for any ops reported as warnings by optracker
265 void check_ops_in_flight();
267 int mds_slow_req_count
;
270 * Share MDSMap with clients
272 void bcast_mds_map(); // to mounted clients
273 epoch_t last_client_mdsmap_bcast
;
275 map
<mds_rank_t
,DecayCounter
> export_targets
; /* targets this MDS is exporting to or wants/tries to */
277 void create_logger();
280 void queue_waiter(MDSInternalContextBase
*c
) {
281 finished_queue
.push_back(c
);
282 progress_thread
.signal();
284 void queue_waiters(list
<MDSInternalContextBase
*>& ls
) {
285 finished_queue
.splice( finished_queue
.end(), ls
);
286 progress_thread
.signal();
292 LogChannelRef
&clog_
,
298 Context
*respawn_hook_
,
299 Context
*suicide_hook_
);
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.
317 * Call this periodically if inside a potentially long running piece
318 * of code while holding the mds_lock
320 void heartbeat_reset();
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.
329 * Callers must already hold mds_lock.
334 * Wrapper around `damaged` for users who are not
335 * already holding mds_lock.
337 * Callers must not already hold mds_lock.
339 void damaged_unlocked();
341 utime_t
get_laggy_until() const;
343 void send_message_mds(Message
*m
, mds_rank_t mds
);
344 void forward_message_mds(Message
*req
, mds_rank_t mds
);
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());
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());
358 void wait_for_active_peer(mds_rank_t who
, MDSInternalContextBase
*c
) {
359 waiting_for_active_peer
[who
].push_back(c
);
361 void wait_for_cluster_recovered(MDSInternalContextBase
*c
) {
362 assert(cluster_degraded
);
363 waiting_for_active_peer
[MDS_RANK_NONE
].push_back(c
);
366 void wait_for_active(MDSInternalContextBase
*c
) {
367 waiting_for_active
.push_back(c
);
369 void wait_for_replay(MDSInternalContextBase
*c
) {
370 waiting_for_replay
.push_back(c
);
372 void wait_for_reconnect(MDSInternalContextBase
*c
) {
373 waiting_for_reconnect
.push_back(c
);
375 void wait_for_resolve(MDSInternalContextBase
*c
) {
376 waiting_for_resolve
.push_back(c
);
378 void wait_for_mdsmap(epoch_t e
, MDSInternalContextBase
*c
) {
379 waiting_for_mdsmap
[e
].push_back(c
);
381 void enqueue_replay(MDSInternalContextBase
*c
) {
382 replay_queue
.push_back(c
);
385 bool queue_one_replay();
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;
391 ceph_tid_t
issue_tid() { return ++last_tid
; }
395 MDSMap
*get_mds_map() { return mdsmap
; }
397 int get_req_rate() const { return logger
->get(l_mds_request
); }
399 int get_mds_slow_req_count() const { return mds_slow_req_count
; }
401 void dump_status(Formatter
*f
) const;
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
);
409 bool evict_client(int64_t session_id
, bool wait
, bool blacklist
,
410 std::stringstream
& ss
, Context
*on_killed
=nullptr);
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
,
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(
425 bool command_dirfrag_merge(
428 bool command_dirfrag_ls(
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
,
439 Messenger
*messenger
;
442 Context
*respawn_hook
;
443 Context
*suicide_hook
;
445 // Friended to access retry_dispatch
446 friend class C_MDS_RetryMessage
;
448 // FIXME the state machine logic should be separable from the dispatch
449 // logic that calls it.
451 void calc_recovery_set();
452 void request_state(MDSMap::DaemonState s
);
454 bool standby_replaying
; // true if current replay pass is in standby-replay mode
457 // The MDSMap is available, configure default layouts and structures
458 MDS_BOOT_INITIAL
= 0,
459 // We are ready to open some inodes
461 // We are ready to do a replay if needed
462 MDS_BOOT_PREPARE_LOG
,
463 // Replay is complete
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
472 void creating_done();
473 void starting_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
;
482 void resolve_start();
484 void reconnect_start();
485 void reconnect_done();
486 void rejoin_joint_start();
489 void recovery_done(int oldstate
);
490 void clientreplay_start();
491 void clientreplay_done();
493 void stopping_start();
494 void stopping_done();
496 void validate_sessions();
500 void handle_mds_recovery(mds_rank_t who
);
501 void handle_mds_failure(mds_rank_t who
);
504 /* Update MDSMap export_targets for this rank. Called on ::tick(). */
505 void update_targets(utime_t now
);
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
{
515 C_MDS_RetryMessage(MDSRank
*mds
, Message
*m
)
516 : MDSInternalContext(mds
)
521 void finish(int r
) override
{
522 mds
->retry_dispatch(m
);
527 * The aspect of MDSRank exposed to MDSDaemon but not subsystems: i.e.
528 * the service/dispatcher stuff like init/shutdown that subsystems should
531 class MDSRankDispatcher
: public MDSRank
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();
541 void update_log_config();
544 const cmdmap_t
&cmdmap
,
547 std::stringstream
*ds
,
548 std::stringstream
*ss
,
551 void dump_sessions(const SessionFilter
&filter
, Formatter
*f
) const;
552 void evict_clients(const SessionFilter
&filter
, MCommand
*m
);
554 // Call into me from MDS::ms_dispatch
555 bool ms_dispatch(Message
*m
);
560 LogChannelRef
&clog_
,
566 Context
*respawn_hook_
,
567 Context
*suicide_hook_
);
570 // This utility for MDS and MDSRank dispatchers.
571 #define ALLOW_MESSAGES_FROM(peers) \
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; \
581 #endif // MDS_RANK_H_