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) 2004-2006 Sage Weil <sage@newdream.net>
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.
19 #include "MDSContext.h"
21 #include "osdc/Journaler.h"
22 #include "mds/JournalPointer.h"
24 #include "common/entity_name.h"
25 #include "common/perf_counters.h"
26 #include "common/Cond.h"
28 #include "events/ESubtreeMap.h"
30 #include "common/config.h"
31 #include "common/errno.h"
32 #include "include/ceph_assert.h"
34 #define dout_context g_ceph_context
35 #define dout_subsys ceph_subsys_mds
37 #define dout_prefix *_dout << "mds." << mds->get_nodeid() << ".log "
42 if (journaler
) { delete journaler
; journaler
= 0; }
44 g_ceph_context
->get_perfcounters_collection()->remove(logger
);
51 void MDLog::create_logger()
53 PerfCountersBuilder
plb(g_ceph_context
, "mds_log", l_mdl_first
, l_mdl_last
);
55 plb
.add_u64_counter(l_mdl_evadd
, "evadd", "Events submitted", "subm",
56 PerfCountersBuilder::PRIO_INTERESTING
);
57 plb
.add_u64(l_mdl_ev
, "ev", "Events", "evts",
58 PerfCountersBuilder::PRIO_INTERESTING
);
59 plb
.add_u64(l_mdl_seg
, "seg", "Segments", "segs",
60 PerfCountersBuilder::PRIO_INTERESTING
);
62 plb
.set_prio_default(PerfCountersBuilder::PRIO_USEFUL
);
63 plb
.add_u64(l_mdl_evexg
, "evexg", "Expiring events");
64 plb
.add_u64(l_mdl_evexd
, "evexd", "Current expired events");
65 plb
.add_u64(l_mdl_segexg
, "segexg", "Expiring segments");
66 plb
.add_u64(l_mdl_segexd
, "segexd", "Current expired segments");
67 plb
.add_u64_counter(l_mdl_replayed
, "replayed", "Events replayed",
68 "repl", PerfCountersBuilder::PRIO_INTERESTING
);
69 plb
.add_time_avg(l_mdl_jlat
, "jlat", "Journaler flush latency");
70 plb
.add_u64_counter(l_mdl_evex
, "evex", "Total expired events");
71 plb
.add_u64_counter(l_mdl_evtrm
, "evtrm", "Trimmed events");
72 plb
.add_u64_counter(l_mdl_segadd
, "segadd", "Segments added");
73 plb
.add_u64_counter(l_mdl_segex
, "segex", "Total expired segments");
74 plb
.add_u64_counter(l_mdl_segtrm
, "segtrm", "Trimmed segments");
76 plb
.set_prio_default(PerfCountersBuilder::PRIO_DEBUGONLY
);
77 plb
.add_u64(l_mdl_expos
, "expos", "Journaler xpire position");
78 plb
.add_u64(l_mdl_wrpos
, "wrpos", "Journaler write position");
79 plb
.add_u64(l_mdl_rdpos
, "rdpos", "Journaler read position");
82 logger
= plb
.create_perf_counters();
83 g_ceph_context
->get_perfcounters_collection()->add(logger
);
86 void MDLog::set_write_iohint(unsigned iohint_flags
)
88 journaler
->set_write_iohint(iohint_flags
);
91 class C_MDL_WriteError
: public MDSIOContextBase
{
94 MDSRank
*get_mds() override
{return mdlog
->mds
;}
96 void finish(int r
) override
{
97 MDSRank
*mds
= get_mds();
98 // assume journal is reliable, so don't choose action based on
99 // g_conf()->mds_action_on_write_error.
100 if (r
== -EBLACKLISTED
) {
101 derr
<< "we have been blacklisted (fenced), respawning..." << dendl
;
104 derr
<< "unhandled error " << cpp_strerror(r
) << ", shutting down..." << dendl
;
105 // Although it's possible that this could be something transient,
106 // it's severe and scary, so disable this rank until an administrator
108 mds
->clog
->error() << "Unhandled journal write error on MDS rank " <<
109 mds
->get_nodeid() << ": " << cpp_strerror(r
) << ", shutting down.";
111 ceph_abort(); // damaged should never return
116 explicit C_MDL_WriteError(MDLog
*m
) :
117 MDSIOContextBase(false), mdlog(m
) {}
118 void print(ostream
& out
) const override
{
119 out
<< "mdlog_write_error";
124 void MDLog::write_head(MDSContext
*c
)
128 fin
= new C_IO_Wrapper(mds
, c
);
130 journaler
->write_head(fin
);
133 uint64_t MDLog::get_read_pos() const
135 return journaler
->get_read_pos();
138 uint64_t MDLog::get_write_pos() const
140 return journaler
->get_write_pos();
143 uint64_t MDLog::get_safe_pos() const
145 return journaler
->get_write_safe_pos();
150 void MDLog::create(MDSContext
*c
)
152 dout(5) << "create empty log" << dendl
;
154 C_GatherBuilder
gather(g_ceph_context
);
155 // This requires an OnFinisher wrapper because Journaler will call back the completion for write_head inside its own lock
156 // XXX but should maybe that be handled inside Journaler?
157 gather
.set_finisher(new C_IO_Wrapper(mds
, c
));
159 // The inode of the default Journaler we will create
160 ino
= MDS_INO_LOG_OFFSET
+ mds
->get_nodeid();
162 // Instantiate Journaler and start async write to RADOS
163 ceph_assert(journaler
== NULL
);
164 journaler
= new Journaler("mdlog", ino
, mds
->mdsmap
->get_metadata_pool(),
165 CEPH_FS_ONDISK_MAGIC
, mds
->objecter
, logger
,
166 l_mdl_jlat
, mds
->finisher
);
167 ceph_assert(journaler
->is_readonly());
168 journaler
->set_write_error_handler(new C_MDL_WriteError(this));
169 journaler
->set_writeable();
170 journaler
->create(&mds
->mdcache
->default_log_layout
, g_conf()->mds_journal_format
);
171 journaler
->write_head(gather
.new_sub());
173 // Async write JournalPointer to RADOS
174 JournalPointer
jp(mds
->get_nodeid(), mds
->mdsmap
->get_metadata_pool());
177 jp
.save(mds
->objecter
, gather
.new_sub());
181 logger
->set(l_mdl_expos
, journaler
->get_expire_pos());
182 logger
->set(l_mdl_wrpos
, journaler
->get_write_pos());
184 submit_thread
.create("md_submit");
187 void MDLog::open(MDSContext
*c
)
189 dout(5) << "open discovering log bounds" << dendl
;
191 ceph_assert(!recovery_thread
.is_started());
192 recovery_thread
.set_completion(c
);
193 recovery_thread
.create("md_recov_open");
195 submit_thread
.create("md_submit");
196 // either append() or replay() will follow.
200 * Final part of reopen() procedure, after recovery_thread
201 * has done its thing we call append()
203 class C_ReopenComplete
: public MDSInternalContext
{
205 MDSContext
*on_complete
;
207 C_ReopenComplete(MDLog
*mdlog_
, MDSContext
*on_complete_
) : MDSInternalContext(mdlog_
->mds
), mdlog(mdlog_
), on_complete(on_complete_
) {}
208 void finish(int r
) override
{
210 on_complete
->complete(r
);
215 * Given that open() has been called in the past, go through the journal
216 * recovery procedure again, potentially reformatting the journal if it
217 * was in an old format.
219 void MDLog::reopen(MDSContext
*c
)
221 dout(5) << "reopen" << dendl
;
223 // Because we will call append() at the completion of this, check that we have already
224 // read the whole journal.
225 ceph_assert(journaler
!= NULL
);
226 ceph_assert(journaler
->get_read_pos() == journaler
->get_write_pos());
231 // recovery_thread was started at some point in the past. Although
232 // it has called it's completion if we made it back here, it might
233 // still not have been cleaned up: join it.
234 recovery_thread
.join();
236 recovery_thread
.set_completion(new C_ReopenComplete(this, c
));
237 recovery_thread
.create("md_recov_reopen");
242 dout(5) << "append positioning at end and marking writeable" << dendl
;
243 journaler
->set_read_pos(journaler
->get_write_pos());
244 journaler
->set_expire_pos(journaler
->get_write_pos());
246 journaler
->set_writeable();
248 logger
->set(l_mdl_expos
, journaler
->get_write_pos());
253 // -------------------------------------------------
255 void MDLog::_start_entry(LogEvent
*e
)
257 ceph_assert(submit_mutex
.is_locked_by_me());
259 ceph_assert(cur_event
== NULL
);
264 EMetaBlob
*metablob
= e
->get_metablob();
266 metablob
->event_seq
= event_seq
;
267 metablob
->last_subtree_map
= get_last_segment_seq();
271 void MDLog::cancel_entry(LogEvent
*le
)
273 ceph_assert(le
== cur_event
);
278 void MDLog::_submit_entry(LogEvent
*le
, MDSLogContextBase
*c
)
280 ceph_assert(submit_mutex
.is_locked_by_me());
281 ceph_assert(!mds
->is_any_replay());
282 ceph_assert(!capped
);
284 ceph_assert(le
== cur_event
);
287 // let the event register itself in the segment
288 ceph_assert(!segments
.empty());
289 LogSegment
*ls
= segments
.rbegin()->second
;
293 le
->update_segment();
294 le
->set_stamp(ceph_clock_now());
296 mdsmap_up_features
= mds
->mdsmap
->get_up_features();
297 pending_events
[ls
->seq
].push_back(PendingEvent(le
, c
));
301 logger
->inc(l_mdl_evadd
);
302 logger
->set(l_mdl_ev
, num_events
);
307 uint64_t period
= journaler
->get_layout_period();
308 // start a new segment?
309 if (le
->get_type() == EVENT_SUBTREEMAP
||
310 (le
->get_type() == EVENT_IMPORTFINISH
&& mds
->is_resolve())) {
311 // avoid infinite loop when ESubtreeMap is very large.
312 // do not insert ESubtreeMap among EImportFinish events that finish
313 // disambiguate imports. Because the ESubtreeMap reflects the subtree
314 // state when all EImportFinish events are replayed.
315 } else if (ls
->end
/period
!= ls
->offset
/period
||
316 ls
->num_events
>= g_conf()->mds_log_events_per_segment
) {
317 dout(10) << "submit_entry also starting new segment: last = "
318 << ls
->seq
<< "/" << ls
->offset
<< ", event seq = " << event_seq
<< dendl
;
319 _start_new_segment();
320 } else if (g_conf()->mds_debug_subtrees
&&
321 le
->get_type() != EVENT_SUBTREEMAP_TEST
) {
322 // debug: journal this every time to catch subtree replay bugs.
323 // use a different event id so it doesn't get interpreted as a
324 // LogSegment boundary on replay.
325 LogEvent
*sle
= mds
->mdcache
->create_subtree_map();
326 sle
->set_type(EVENT_SUBTREEMAP_TEST
);
327 _submit_entry(sle
, NULL
);
332 * Invoked on the flush after each entry submitted
334 class C_MDL_Flushed
: public MDSLogContextBase
{
337 MDSRank
*get_mds() override
{return mdlog
->mds
;}
340 void finish(int r
) override
{
342 wrapped
->complete(r
);
346 C_MDL_Flushed(MDLog
*m
, MDSContext
*w
)
347 : mdlog(m
), wrapped(w
) {}
348 C_MDL_Flushed(MDLog
*m
, uint64_t wp
) : mdlog(m
), wrapped(NULL
) {
353 void MDLog::_submit_thread()
355 dout(10) << "_submit_thread start" << dendl
;
359 while (!mds
->is_daemon_stopping()) {
360 if (g_conf()->mds_log_pause
) {
361 submit_cond
.Wait(submit_mutex
);
365 map
<uint64_t,list
<PendingEvent
> >::iterator it
= pending_events
.begin();
366 if (it
== pending_events
.end()) {
367 submit_cond
.Wait(submit_mutex
);
371 if (it
->second
.empty()) {
372 pending_events
.erase(it
);
376 int64_t features
= mdsmap_up_features
;
377 PendingEvent data
= it
->second
.front();
378 it
->second
.pop_front();
380 submit_mutex
.Unlock();
383 LogEvent
*le
= data
.le
;
384 LogSegment
*ls
= le
->_segment
;
385 // encode it, with event type
387 le
->encode_with_header(bl
, features
);
389 uint64_t write_pos
= journaler
->get_write_pos();
391 le
->set_start_off(write_pos
);
392 if (le
->get_type() == EVENT_SUBTREEMAP
)
393 ls
->offset
= write_pos
;
395 dout(5) << "_submit_thread " << write_pos
<< "~" << bl
.length()
396 << " : " << *le
<< dendl
;
399 const uint64_t new_write_pos
= journaler
->append_entry(bl
); // bl is destroyed.
400 ls
->end
= new_write_pos
;
402 MDSLogContextBase
*fin
;
404 fin
= dynamic_cast<MDSLogContextBase
*>(data
.fin
);
406 fin
->set_write_pos(new_write_pos
);
408 fin
= new C_MDL_Flushed(this, new_write_pos
);
411 journaler
->wait_for_flush(fin
);
417 logger
->set(l_mdl_wrpos
, ls
->end
);
423 dynamic_cast<MDSContext
*>(data
.fin
);
425 C_MDL_Flushed
*fin2
= new C_MDL_Flushed(this, fin
);
426 fin2
->set_write_pos(journaler
->get_write_pos());
427 journaler
->wait_for_flush(fin2
);
440 submit_mutex
.Unlock();
443 void MDLog::wait_for_safe(MDSContext
*c
)
447 bool no_pending
= true;
448 if (!pending_events
.empty()) {
449 pending_events
.rbegin()->second
.push_back(PendingEvent(NULL
, c
));
451 submit_cond
.Signal();
454 submit_mutex
.Unlock();
457 journaler
->wait_for_flush(new C_IO_Wrapper(mds
, c
));
464 bool do_flush
= unflushed
> 0;
466 if (!pending_events
.empty()) {
467 pending_events
.rbegin()->second
.push_back(PendingEvent(NULL
, NULL
, true));
469 submit_cond
.Signal();
472 submit_mutex
.Unlock();
478 void MDLog::kick_submitter()
480 std::lock_guard
l(submit_mutex
);
481 submit_cond
.Signal();
486 dout(5) << "cap" << dendl
;
490 void MDLog::shutdown()
492 ceph_assert(mds
->mds_lock
.is_locked_by_me());
494 dout(5) << "shutdown" << dendl
;
495 if (submit_thread
.is_started()) {
496 ceph_assert(mds
->is_daemon_stopping());
498 if (submit_thread
.am_self()) {
499 // Called suicide from the thread: trust it to do no work after
500 // returning from suicide, and subsequently respect mds->is_daemon_stopping()
501 // and fall out of its loop.
503 mds
->mds_lock
.Unlock();
504 // Because MDS::stopping is true, it's safe to drop mds_lock: nobody else
505 // picking it up will do anything with it.
508 submit_cond
.Signal();
509 submit_mutex
.Unlock();
511 mds
->mds_lock
.Lock();
513 submit_thread
.join();
517 // Replay thread can be stuck inside e.g. Journaler::wait_for_readable,
518 // so we need to shutdown the journaler first.
520 journaler
->shutdown();
523 if (replay_thread
.is_started() && !replay_thread
.am_self()) {
524 mds
->mds_lock
.Unlock();
525 replay_thread
.join();
526 mds
->mds_lock
.Lock();
529 if (recovery_thread
.is_started() && !recovery_thread
.am_self()) {
530 mds
->mds_lock
.Unlock();
531 recovery_thread
.join();
532 mds
->mds_lock
.Lock();
537 // -----------------------------
540 void MDLog::_start_new_segment()
542 _prepare_new_segment();
543 _journal_segment_subtree_map(NULL
);
546 void MDLog::_prepare_new_segment()
548 ceph_assert(submit_mutex
.is_locked_by_me());
550 uint64_t seq
= event_seq
+ 1;
551 dout(7) << __func__
<< " seq " << seq
<< dendl
;
553 segments
[seq
] = new LogSegment(seq
);
555 logger
->inc(l_mdl_segadd
);
556 logger
->set(l_mdl_seg
, segments
.size());
558 // Adjust to next stray dir
559 dout(10) << "Advancing to next stray directory on mds " << mds
->get_nodeid()
561 mds
->mdcache
->advance_stray();
564 void MDLog::_journal_segment_subtree_map(MDSContext
*onsync
)
566 ceph_assert(submit_mutex
.is_locked_by_me());
568 dout(7) << __func__
<< dendl
;
569 ESubtreeMap
*sle
= mds
->mdcache
->create_subtree_map();
570 sle
->event_seq
= get_last_segment_seq();
572 _submit_entry(sle
, new C_MDL_Flushed(this, onsync
));
575 class C_OFT_Committed
: public MDSInternalContext
{
579 C_OFT_Committed(MDLog
*l
, uint64_t s
) :
580 MDSInternalContext(l
->mds
), mdlog(l
), seq(s
) {}
581 void finish(int ret
) override
{
582 mdlog
->trim_expired_segments();
586 void MDLog::trim(int m
)
588 unsigned max_segments
= g_conf()->mds_log_max_segments
;
589 int max_events
= g_conf()->mds_log_max_events
;
593 if (mds
->mdcache
->is_readonly()) {
594 dout(10) << "trim, ignoring read-only FS" << dendl
;
598 // Clamp max_events to not be smaller than events per segment
599 if (max_events
> 0 && max_events
<= g_conf()->mds_log_events_per_segment
) {
600 max_events
= g_conf()->mds_log_events_per_segment
+ 1;
607 << segments
.size() << " / " << max_segments
<< " segments, "
608 << num_events
<< " / " << max_events
<< " events"
609 << ", " << expiring_segments
.size() << " (" << expiring_events
<< ") expiring"
610 << ", " << expired_segments
.size() << " (" << expired_events
<< ") expired"
613 if (segments
.empty()) {
614 submit_mutex
.Unlock();
618 // hack: only trim for a few seconds at a time
619 utime_t stop
= ceph_clock_now();
622 int op_prio
= CEPH_MSG_PRIO_LOW
+
623 (CEPH_MSG_PRIO_HIGH
- CEPH_MSG_PRIO_LOW
) *
624 expiring_segments
.size() / max_segments
;
625 if (op_prio
> CEPH_MSG_PRIO_HIGH
)
626 op_prio
= CEPH_MSG_PRIO_HIGH
;
628 unsigned new_expiring_segments
= 0;
630 map
<uint64_t,LogSegment
*>::iterator p
= segments
.begin();
631 while (p
!= segments
.end()) {
632 if (stop
< ceph_clock_now())
635 unsigned num_remaining_segments
= (segments
.size() - expired_segments
.size() - expiring_segments
.size());
636 if ((num_remaining_segments
<= max_segments
) &&
637 (max_events
< 0 || num_events
- expiring_events
- expired_events
<= max_events
))
640 // Do not trim too many segments at once for peak workload. If mds keeps creating N segments each tick,
641 // the upper bound of 'num_remaining_segments - max_segments' is '2 * N'
642 if (new_expiring_segments
* 2 > num_remaining_segments
)
645 // look at first segment
646 LogSegment
*ls
= p
->second
;
650 if (pending_events
.count(ls
->seq
) ||
651 ls
->end
> safe_pos
) {
652 dout(5) << "trim segment " << ls
->seq
<< "/" << ls
->offset
<< ", not fully flushed yet, safe "
653 << journaler
->get_write_safe_pos() << " < end " << ls
->end
<< dendl
;
657 if (expiring_segments
.count(ls
)) {
658 dout(5) << "trim already expiring segment " << ls
->seq
<< "/" << ls
->offset
659 << ", " << ls
->num_events
<< " events" << dendl
;
660 } else if (expired_segments
.count(ls
)) {
661 dout(5) << "trim already expired segment " << ls
->seq
<< "/" << ls
->offset
662 << ", " << ls
->num_events
<< " events" << dendl
;
664 ceph_assert(expiring_segments
.count(ls
) == 0);
665 new_expiring_segments
++;
666 expiring_segments
.insert(ls
);
667 expiring_events
+= ls
->num_events
;
668 submit_mutex
.Unlock();
670 uint64_t last_seq
= ls
->seq
;
671 try_expire(ls
, op_prio
);
674 p
= segments
.lower_bound(last_seq
+ 1);
679 !mds
->mdcache
->open_file_table
.is_any_committing()) {
680 uint64_t last_seq
= get_last_segment_seq();
681 if (mds
->mdcache
->open_file_table
.is_any_dirty() ||
682 last_seq
> mds
->mdcache
->open_file_table
.get_committed_log_seq()) {
683 submit_mutex
.Unlock();
684 mds
->mdcache
->open_file_table
.commit(new C_OFT_Committed(this, last_seq
),
685 last_seq
, CEPH_MSG_PRIO_HIGH
);
690 // discard expired segments and unlock submit_mutex
691 _trim_expired_segments();
694 class C_MaybeExpiredSegment
: public MDSInternalContext
{
699 C_MaybeExpiredSegment(MDLog
*mdl
, LogSegment
*s
, int p
) :
700 MDSInternalContext(mdl
->mds
), mdlog(mdl
), ls(s
), op_prio(p
) {}
701 void finish(int res
) override
{
703 mdlog
->mds
->handle_write_error(res
);
704 mdlog
->_maybe_expired(ls
, op_prio
);
709 * Like MDLog::trim, but instead of trimming to max_segments, trim all but the latest
712 int MDLog::trim_all()
716 dout(10) << __func__
<< ": "
718 << "/" << expiring_segments
.size()
719 << "/" << expired_segments
.size() << dendl
;
721 uint64_t last_seq
= 0;
722 if (!segments
.empty()) {
723 last_seq
= get_last_segment_seq();
725 !mds
->mdcache
->open_file_table
.is_any_committing() &&
726 last_seq
> mds
->mdcache
->open_file_table
.get_committing_log_seq()) {
727 submit_mutex
.Unlock();
728 mds
->mdcache
->open_file_table
.commit(new C_OFT_Committed(this, last_seq
),
729 last_seq
, CEPH_MSG_PRIO_DEFAULT
);
734 map
<uint64_t,LogSegment
*>::iterator p
= segments
.begin();
735 while (p
!= segments
.end() &&
736 p
->first
< last_seq
&&
737 p
->second
->end
< safe_pos
) { // next segment should have been started
738 LogSegment
*ls
= p
->second
;
741 // Caller should have flushed journaler before calling this
742 if (pending_events
.count(ls
->seq
)) {
743 dout(5) << __func__
<< ": segment " << ls
->seq
<< " has pending events" << dendl
;
744 submit_mutex
.Unlock();
748 if (expiring_segments
.count(ls
)) {
749 dout(5) << "trim already expiring segment " << ls
->seq
<< "/" << ls
->offset
750 << ", " << ls
->num_events
<< " events" << dendl
;
751 } else if (expired_segments
.count(ls
)) {
752 dout(5) << "trim already expired segment " << ls
->seq
<< "/" << ls
->offset
753 << ", " << ls
->num_events
<< " events" << dendl
;
755 ceph_assert(expiring_segments
.count(ls
) == 0);
756 expiring_segments
.insert(ls
);
757 expiring_events
+= ls
->num_events
;
758 submit_mutex
.Unlock();
760 uint64_t next_seq
= ls
->seq
+ 1;
761 try_expire(ls
, CEPH_MSG_PRIO_DEFAULT
);
764 p
= segments
.lower_bound(next_seq
);
768 _trim_expired_segments();
774 void MDLog::try_expire(LogSegment
*ls
, int op_prio
)
776 MDSGatherBuilder
gather_bld(g_ceph_context
);
777 ls
->try_to_expire(mds
, gather_bld
, op_prio
);
779 if (gather_bld
.has_subs()) {
780 dout(5) << "try_expire expiring segment " << ls
->seq
<< "/" << ls
->offset
<< dendl
;
781 gather_bld
.set_finisher(new C_MaybeExpiredSegment(this, ls
, op_prio
));
782 gather_bld
.activate();
784 dout(10) << "try_expire expired segment " << ls
->seq
<< "/" << ls
->offset
<< dendl
;
786 ceph_assert(expiring_segments
.count(ls
));
787 expiring_segments
.erase(ls
);
788 expiring_events
-= ls
->num_events
;
790 submit_mutex
.Unlock();
793 logger
->set(l_mdl_segexg
, expiring_segments
.size());
794 logger
->set(l_mdl_evexg
, expiring_events
);
797 void MDLog::_maybe_expired(LogSegment
*ls
, int op_prio
)
799 if (mds
->mdcache
->is_readonly()) {
800 dout(10) << "_maybe_expired, ignoring read-only FS" << dendl
;
804 dout(10) << "_maybe_expired segment " << ls
->seq
<< "/" << ls
->offset
805 << ", " << ls
->num_events
<< " events" << dendl
;
806 try_expire(ls
, op_prio
);
809 void MDLog::_trim_expired_segments()
811 ceph_assert(submit_mutex
.is_locked_by_me());
813 uint64_t oft_committed_seq
= mds
->mdcache
->open_file_table
.get_committed_log_seq();
815 // trim expired segments?
816 bool trimmed
= false;
817 while (!segments
.empty()) {
818 LogSegment
*ls
= segments
.begin()->second
;
819 if (!expired_segments
.count(ls
)) {
820 dout(10) << "_trim_expired_segments waiting for " << ls
->seq
<< "/" << ls
->offset
821 << " to expire" << dendl
;
825 if (!capped
&& ls
->seq
>= oft_committed_seq
) {
826 dout(10) << "_trim_expired_segments open file table committedseq " << oft_committed_seq
827 << " <= " << ls
->seq
<< "/" << ls
->offset
<< dendl
;
831 dout(10) << "_trim_expired_segments trimming expired "
832 << ls
->seq
<< "/0x" << std::hex
<< ls
->offset
<< std::dec
<< dendl
;
833 expired_events
-= ls
->num_events
;
834 expired_segments
.erase(ls
);
835 num_events
-= ls
->num_events
;
837 // this was the oldest segment, adjust expire pos
838 if (journaler
->get_expire_pos() < ls
->end
) {
839 journaler
->set_expire_pos(ls
->end
);
840 logger
->set(l_mdl_expos
, ls
->end
);
842 logger
->set(l_mdl_expos
, ls
->offset
);
845 logger
->inc(l_mdl_segtrm
);
846 logger
->inc(l_mdl_evtrm
, ls
->num_events
);
848 segments
.erase(ls
->seq
);
853 submit_mutex
.Unlock();
856 journaler
->write_head(0);
859 void MDLog::trim_expired_segments()
862 _trim_expired_segments();
865 void MDLog::_expired(LogSegment
*ls
)
867 ceph_assert(submit_mutex
.is_locked_by_me());
869 dout(5) << "_expired segment " << ls
->seq
<< "/" << ls
->offset
870 << ", " << ls
->num_events
<< " events" << dendl
;
872 if (!capped
&& ls
== peek_current_segment()) {
873 dout(5) << "_expired not expiring " << ls
->seq
<< "/" << ls
->offset
874 << ", last one and !capped" << dendl
;
877 expired_segments
.insert(ls
);
878 expired_events
+= ls
->num_events
;
880 // Trigger all waiters
881 finish_contexts(g_ceph_context
, ls
->expiry_waiters
);
883 logger
->inc(l_mdl_evex
, ls
->num_events
);
884 logger
->inc(l_mdl_segex
);
887 logger
->set(l_mdl_ev
, num_events
);
888 logger
->set(l_mdl_evexd
, expired_events
);
889 logger
->set(l_mdl_seg
, segments
.size());
890 logger
->set(l_mdl_segexd
, expired_segments
.size());
895 void MDLog::replay(MDSContext
*c
)
897 ceph_assert(journaler
->is_active());
898 ceph_assert(journaler
->is_readonly());
901 if (journaler
->get_read_pos() == journaler
->get_write_pos()) {
902 dout(10) << "replay - journal empty, done." << dendl
;
903 mds
->mdcache
->trim();
904 if (mds
->is_standby_replay())
905 mds
->update_mlogger();
914 waitfor_replay
.push_back(c
);
917 dout(10) << "replay start, from " << journaler
->get_read_pos()
918 << " to " << journaler
->get_write_pos() << dendl
;
920 ceph_assert(num_events
== 0 || already_replayed
);
921 if (already_replayed
) {
922 // Ensure previous instance of ReplayThread is joined before
923 // we create another one
924 replay_thread
.join();
926 already_replayed
= true;
928 replay_thread
.create("md_log_replay");
933 * Resolve the JournalPointer object to a journal file, and
934 * instantiate a Journaler object. This may re-write the journal
935 * if the journal in RADOS appears to be in an old format.
937 * This is a separate thread because of the way it is initialized from inside
938 * the mds lock, which is also the global objecter lock -- rather than split
939 * it up into hard-to-read async operations linked up by contexts,
941 * When this function completes, the `journaler` attribute will be set to
942 * a Journaler instance using the latest available serialization format.
944 void MDLog::_recovery_thread(MDSContext
*completion
)
946 ceph_assert(journaler
== NULL
);
947 if (g_conf()->mds_journal_format
> JOURNAL_FORMAT_MAX
) {
948 dout(0) << "Configuration value for mds_journal_format is out of bounds, max is "
949 << JOURNAL_FORMAT_MAX
<< dendl
;
951 // Oh dear, something unreadable in the store for this rank: require
952 // operator intervention.
954 ceph_abort(); // damaged should not return
957 // First, read the pointer object.
958 // If the pointer object is not present, then create it with
959 // front = default ino and back = null
960 JournalPointer
jp(mds
->get_nodeid(), mds
->mdsmap
->get_metadata_pool());
961 const int read_result
= jp
.load(mds
->objecter
);
962 if (read_result
== -ENOENT
) {
963 inodeno_t
const default_log_ino
= MDS_INO_LOG_OFFSET
+ mds
->get_nodeid();
964 jp
.front
= default_log_ino
;
965 int write_result
= jp
.save(mds
->objecter
);
966 // Nothing graceful we can do for this
967 ceph_assert(write_result
>= 0);
968 } else if (read_result
== -EBLACKLISTED
) {
969 derr
<< "Blacklisted during JournalPointer read! Respawning..." << dendl
;
971 ceph_abort(); // Should be unreachable because respawn calls execv
972 } else if (read_result
!= 0) {
973 mds
->clog
->error() << "failed to read JournalPointer: " << read_result
974 << " (" << cpp_strerror(read_result
) << ")";
975 mds
->damaged_unlocked();
976 ceph_abort(); // Should be unreachable because damaged() calls respawn()
979 // If the back pointer is non-null, that means that a journal
980 // rewrite failed part way through. Erase the back journal
983 if (mds
->is_standby_replay()) {
984 dout(1) << "Journal " << jp
.front
<< " is being rewritten, "
985 << "cannot replay in standby until an active MDS completes rewrite" << dendl
;
986 std::lock_guard
l(mds
->mds_lock
);
987 if (mds
->is_daemon_stopping()) {
990 completion
->complete(-EAGAIN
);
993 dout(1) << "Erasing journal " << jp
.back
<< dendl
;
994 C_SaferCond erase_waiter
;
995 Journaler
back("mdlog", jp
.back
, mds
->mdsmap
->get_metadata_pool(),
996 CEPH_FS_ONDISK_MAGIC
, mds
->objecter
, logger
, l_mdl_jlat
,
999 // Read all about this journal (header + extents)
1000 C_SaferCond recover_wait
;
1001 back
.recover(&recover_wait
);
1002 int recovery_result
= recover_wait
.wait();
1003 if (recovery_result
== -EBLACKLISTED
) {
1004 derr
<< "Blacklisted during journal recovery! Respawning..." << dendl
;
1006 ceph_abort(); // Should be unreachable because respawn calls execv
1007 } else if (recovery_result
!= 0) {
1008 // Journaler.recover succeeds if no journal objects are present: an error
1009 // means something worse like a corrupt header, which we can't handle here.
1010 mds
->clog
->error() << "Error recovering journal " << jp
.front
<< ": "
1011 << cpp_strerror(recovery_result
);
1012 mds
->damaged_unlocked();
1013 ceph_assert(recovery_result
== 0); // Unreachable because damaged() calls respawn()
1016 // We could read journal, so we can erase it.
1017 back
.erase(&erase_waiter
);
1018 int erase_result
= erase_waiter
.wait();
1020 // If we are successful, or find no data, we can update the JournalPointer to
1021 // reflect that the back journal is gone.
1022 if (erase_result
!= 0 && erase_result
!= -ENOENT
) {
1023 derr
<< "Failed to erase journal " << jp
.back
<< ": " << cpp_strerror(erase_result
) << dendl
;
1025 dout(1) << "Successfully erased journal, updating journal pointer" << dendl
;
1027 int write_result
= jp
.save(mds
->objecter
);
1028 // Nothing graceful we can do for this
1029 ceph_assert(write_result
>= 0);
1033 /* Read the header from the front journal */
1034 Journaler
*front_journal
= new Journaler("mdlog", jp
.front
,
1035 mds
->mdsmap
->get_metadata_pool(), CEPH_FS_ONDISK_MAGIC
, mds
->objecter
,
1036 logger
, l_mdl_jlat
, mds
->finisher
);
1038 // Assign to ::journaler so that we can be aborted by ::shutdown while
1039 // waiting for journaler recovery
1041 std::lock_guard
l(mds
->mds_lock
);
1042 journaler
= front_journal
;
1045 C_SaferCond recover_wait
;
1046 front_journal
->recover(&recover_wait
);
1047 dout(4) << "Waiting for journal " << jp
.front
<< " to recover..." << dendl
;
1048 int recovery_result
= recover_wait
.wait();
1049 dout(4) << "Journal " << jp
.front
<< " recovered." << dendl
;
1051 if (recovery_result
== -EBLACKLISTED
) {
1052 derr
<< "Blacklisted during journal recovery! Respawning..." << dendl
;
1054 ceph_abort(); // Should be unreachable because respawn calls execv
1055 } else if (recovery_result
!= 0) {
1056 mds
->clog
->error() << "Error recovering journal " << jp
.front
<< ": "
1057 << cpp_strerror(recovery_result
);
1058 mds
->damaged_unlocked();
1059 ceph_assert(recovery_result
== 0); // Unreachable because damaged() calls respawn()
1062 /* Check whether the front journal format is acceptable or needs re-write */
1063 if (front_journal
->get_stream_format() > JOURNAL_FORMAT_MAX
) {
1064 dout(0) << "Journal " << jp
.front
<< " is in unknown format " << front_journal
->get_stream_format()
1065 << ", does this MDS daemon require upgrade?" << dendl
;
1067 std::lock_guard
l(mds
->mds_lock
);
1068 if (mds
->is_daemon_stopping()) {
1070 delete front_journal
;
1073 completion
->complete(-EINVAL
);
1075 } else if (mds
->is_standby_replay() || front_journal
->get_stream_format() >= g_conf()->mds_journal_format
) {
1076 /* The journal is of configured format, or we are in standbyreplay and will
1077 * tolerate replaying old journals until we have to go active. Use front_journal as
1078 * our journaler attribute and complete */
1079 dout(4) << "Recovered journal " << jp
.front
<< " in format " << front_journal
->get_stream_format() << dendl
;
1080 journaler
->set_write_error_handler(new C_MDL_WriteError(this));
1082 std::lock_guard
l(mds
->mds_lock
);
1083 if (mds
->is_daemon_stopping()) {
1086 completion
->complete(0);
1089 /* Hand off to reformat routine, which will ultimately set the
1090 * completion when it has done its thing */
1091 dout(1) << "Journal " << jp
.front
<< " has old format "
1092 << front_journal
->get_stream_format() << ", it will now be updated" << dendl
;
1093 _reformat_journal(jp
, front_journal
, completion
);
1098 * Blocking rewrite of the journal to a new file, followed by
1099 * swap of journal pointer to point to the new one.
1101 * We write the new journal to the 'back' journal from the JournalPointer,
1102 * swapping pointers to make that one the front journal only when we have
1105 void MDLog::_reformat_journal(JournalPointer
const &jp_in
, Journaler
*old_journal
, MDSContext
*completion
)
1107 ceph_assert(!jp_in
.is_null());
1108 ceph_assert(completion
!= NULL
);
1109 ceph_assert(old_journal
!= NULL
);
1111 JournalPointer jp
= jp_in
;
1113 /* Set JournalPointer.back to the location we will write the new journal */
1114 inodeno_t primary_ino
= MDS_INO_LOG_OFFSET
+ mds
->get_nodeid();
1115 inodeno_t secondary_ino
= MDS_INO_LOG_BACKUP_OFFSET
+ mds
->get_nodeid();
1116 jp
.back
= (jp
.front
== primary_ino
? secondary_ino
: primary_ino
);
1117 int write_result
= jp
.save(mds
->objecter
);
1118 ceph_assert(write_result
== 0);
1120 /* Create the new Journaler file */
1121 Journaler
*new_journal
= new Journaler("mdlog", jp
.back
,
1122 mds
->mdsmap
->get_metadata_pool(), CEPH_FS_ONDISK_MAGIC
, mds
->objecter
, logger
, l_mdl_jlat
, mds
->finisher
);
1123 dout(4) << "Writing new journal header " << jp
.back
<< dendl
;
1124 file_layout_t new_layout
= old_journal
->get_layout();
1125 new_journal
->set_writeable();
1126 new_journal
->create(&new_layout
, g_conf()->mds_journal_format
);
1128 /* Write the new journal header to RADOS */
1129 C_SaferCond write_head_wait
;
1130 new_journal
->write_head(&write_head_wait
);
1131 write_head_wait
.wait();
1133 // Read in the old journal, and whenever we have readable events,
1134 // write them to the new journal.
1137 // In old format journals before event_seq was introduced, the serialized
1138 // offset of a SubtreeMap message in the log is used as the unique ID for
1139 // a log segment. Because we change serialization, this will end up changing
1140 // for us, so we have to explicitly update the fields that point back to that
1142 std::map
<log_segment_seq_t
, log_segment_seq_t
> segment_pos_rewrite
;
1144 // The logic in here borrowed from replay_thread expects mds_lock to be held,
1145 // e.g. between checking readable and doing wait_for_readable so that journaler
1146 // state doesn't change in between.
1147 uint32_t events_transcribed
= 0;
1149 while (!old_journal
->is_readable() &&
1150 old_journal
->get_read_pos() < old_journal
->get_write_pos() &&
1151 !old_journal
->get_error()) {
1153 // Issue a journal prefetch
1154 C_SaferCond readable_waiter
;
1155 old_journal
->wait_for_readable(&readable_waiter
);
1157 // Wait for a journal prefetch to complete
1158 readable_waiter
.wait();
1160 if (old_journal
->get_error()) {
1161 r
= old_journal
->get_error();
1162 dout(0) << "_replay journaler got error " << r
<< ", aborting" << dendl
;
1166 if (!old_journal
->is_readable() &&
1167 old_journal
->get_read_pos() == old_journal
->get_write_pos())
1170 // Read one serialized LogEvent
1171 ceph_assert(old_journal
->is_readable());
1173 uint64_t le_pos
= old_journal
->get_read_pos();
1174 bool r
= old_journal
->try_read_entry(bl
);
1175 if (!r
&& old_journal
->get_error())
1179 // Update segment_pos_rewrite
1180 auto le
= LogEvent::decode_event(bl
.cbegin());
1182 bool modified
= false;
1184 if (le
->get_type() == EVENT_SUBTREEMAP
||
1185 le
->get_type() == EVENT_RESETJOURNAL
) {
1186 auto sle
= dynamic_cast<ESubtreeMap
*>(le
.get());
1187 if (sle
== NULL
|| sle
->event_seq
== 0) {
1188 // A non-explicit event seq: the effective sequence number
1189 // of this segment is it's position in the old journal and
1190 // the new effective sequence number will be its position
1191 // in the new journal.
1192 segment_pos_rewrite
[le_pos
] = new_journal
->get_write_pos();
1193 dout(20) << __func__
<< " discovered segment seq mapping "
1194 << le_pos
<< " -> " << new_journal
->get_write_pos() << dendl
;
1200 // Rewrite segment references if necessary
1201 EMetaBlob
*blob
= le
->get_metablob();
1203 modified
= blob
->rewrite_truncate_finish(mds
, segment_pos_rewrite
);
1206 // Zero-out expire_pos in subtreemap because offsets have changed
1207 // (expire_pos is just an optimization so it's safe to eliminate it)
1208 if (le
->get_type() == EVENT_SUBTREEMAP
1209 || le
->get_type() == EVENT_SUBTREEMAP_TEST
) {
1210 auto& sle
= dynamic_cast<ESubtreeMap
&>(*le
);
1211 dout(20) << __func__
<< " zeroing expire_pos in subtreemap event at "
1212 << le_pos
<< " seq=" << sle
.event_seq
<< dendl
;
1219 le
->encode_with_header(bl
, mds
->mdsmap
->get_up_features());
1222 // Failure from LogEvent::decode, our job is to change the journal wrapper,
1223 // not validate the contents, so pass it through.
1224 dout(1) << __func__
<< " transcribing un-decodable LogEvent at old position "
1225 << old_journal
->get_read_pos() << ", new position " << new_journal
->get_write_pos()
1229 // Write (buffered, synchronous) one serialized LogEvent
1230 events_transcribed
+= 1;
1231 new_journal
->append_entry(bl
);
1234 dout(1) << "Transcribed " << events_transcribed
<< " events, flushing new journal" << dendl
;
1235 C_SaferCond flush_waiter
;
1236 new_journal
->flush(&flush_waiter
);
1237 flush_waiter
.wait();
1239 // If failed to rewrite journal, leave the part written journal
1240 // as garbage to be cleaned up next startup.
1241 ceph_assert(r
== 0);
1243 /* Now that the new journal is safe, we can flip the pointers */
1244 inodeno_t
const tmp
= jp
.front
;
1247 write_result
= jp
.save(mds
->objecter
);
1248 ceph_assert(write_result
== 0);
1250 /* Delete the old journal to free space */
1251 dout(1) << "New journal flushed, erasing old journal" << dendl
;
1252 C_SaferCond erase_waiter
;
1253 old_journal
->erase(&erase_waiter
);
1254 int erase_result
= erase_waiter
.wait();
1255 ceph_assert(erase_result
== 0);
1257 std::lock_guard
l(mds
->mds_lock
);
1258 if (mds
->is_daemon_stopping()) {
1262 ceph_assert(journaler
== old_journal
);
1267 /* Update the pointer to reflect we're back in clean single journal state. */
1269 write_result
= jp
.save(mds
->objecter
);
1270 ceph_assert(write_result
== 0);
1272 /* Reset the Journaler object to its default state */
1273 dout(1) << "Journal rewrite complete, continuing with normal startup" << dendl
;
1275 std::lock_guard
l(mds
->mds_lock
);
1276 if (mds
->is_daemon_stopping()) {
1280 journaler
= new_journal
;
1281 journaler
->set_readonly();
1282 journaler
->set_write_error_handler(new C_MDL_WriteError(this));
1285 /* Trigger completion */
1287 std::lock_guard
l(mds
->mds_lock
);
1288 if (mds
->is_daemon_stopping()) {
1291 completion
->complete(0);
1296 // i am a separate thread
1297 void MDLog::_replay_thread()
1299 dout(10) << "_replay_thread start" << dendl
;
1305 while (!journaler
->is_readable() &&
1306 journaler
->get_read_pos() < journaler
->get_write_pos() &&
1307 !journaler
->get_error()) {
1308 C_SaferCond readable_waiter
;
1309 journaler
->wait_for_readable(&readable_waiter
);
1310 r
= readable_waiter
.wait();
1312 if (journaler
->get_error()) {
1313 r
= journaler
->get_error();
1314 dout(0) << "_replay journaler got error " << r
<< ", aborting" << dendl
;
1316 if (mds
->is_standby_replay()) {
1317 // journal has been trimmed by somebody else
1320 mds
->clog
->error() << "missing journal object";
1321 mds
->damaged_unlocked();
1322 ceph_abort(); // Should be unreachable because damaged() calls respawn()
1324 } else if (r
== -EINVAL
) {
1325 if (journaler
->get_read_pos() < journaler
->get_expire_pos()) {
1326 // this should only happen if you're following somebody else
1327 if(journaler
->is_readonly()) {
1328 dout(0) << "expire_pos is higher than read_pos, returning EAGAIN" << dendl
;
1331 mds
->clog
->error() << "invalid journaler offsets";
1332 mds
->damaged_unlocked();
1333 ceph_abort(); // Should be unreachable because damaged() calls respawn()
1336 /* re-read head and check it
1337 * Given that replay happens in a separate thread and
1338 * the MDS is going to either shut down or restart when
1339 * we return this error, doing it synchronously is fine
1340 * -- as long as we drop the main mds lock--. */
1341 C_SaferCond reread_fin
;
1342 journaler
->reread_head(&reread_fin
);
1343 int err
= reread_fin
.wait();
1345 if (err
== -ENOENT
&& mds
->is_standby_replay()) {
1347 dout(1) << "Journal header went away while in standby replay, journal rewritten?"
1351 dout(0) << "got error while reading head: " << cpp_strerror(err
)
1354 mds
->clog
->error() << "error reading journal header";
1355 mds
->damaged_unlocked();
1356 ceph_abort(); // Should be unreachable because damaged() calls
1360 standby_trim_segments();
1361 if (journaler
->get_read_pos() < journaler
->get_expire_pos()) {
1362 dout(0) << "expire_pos is higher than read_pos, returning EAGAIN" << dendl
;
1370 if (!journaler
->is_readable() &&
1371 journaler
->get_read_pos() == journaler
->get_write_pos())
1374 ceph_assert(journaler
->is_readable() || mds
->is_daemon_stopping());
1377 uint64_t pos
= journaler
->get_read_pos();
1379 bool r
= journaler
->try_read_entry(bl
);
1380 if (!r
&& journaler
->get_error())
1385 auto le
= LogEvent::decode_event(bl
.cbegin());
1387 dout(0) << "_replay " << pos
<< "~" << bl
.length() << " / " << journaler
->get_write_pos()
1388 << " -- unable to decode event" << dendl
;
1389 dout(0) << "dump of unknown or corrupt event:\n";
1393 mds
->clog
->error() << "corrupt journal event at " << pos
<< "~"
1394 << bl
.length() << " / "
1395 << journaler
->get_write_pos();
1396 if (g_conf()->mds_log_skip_corrupt_events
) {
1399 mds
->damaged_unlocked();
1400 ceph_abort(); // Should be unreachable because damaged() calls
1405 le
->set_start_off(pos
);
1408 if (le
->get_type() == EVENT_SUBTREEMAP
||
1409 le
->get_type() == EVENT_RESETJOURNAL
) {
1410 auto sle
= dynamic_cast<ESubtreeMap
*>(le
.get());
1411 if (sle
&& sle
->event_seq
> 0)
1412 event_seq
= sle
->event_seq
;
1415 segments
[event_seq
] = new LogSegment(event_seq
, pos
);
1416 logger
->set(l_mdl_seg
, segments
.size());
1421 // have we seen an import map yet?
1422 if (segments
.empty()) {
1423 dout(10) << "_replay " << pos
<< "~" << bl
.length() << " / " << journaler
->get_write_pos()
1424 << " " << le
->get_stamp() << " -- waiting for subtree_map. (skipping " << *le
<< ")" << dendl
;
1426 dout(10) << "_replay " << pos
<< "~" << bl
.length() << " / " << journaler
->get_write_pos()
1427 << " " << le
->get_stamp() << ": " << *le
<< dendl
;
1428 le
->_segment
= get_current_segment(); // replay may need this
1429 le
->_segment
->num_events
++;
1430 le
->_segment
->end
= journaler
->get_read_pos();
1434 std::lock_guard
l(mds
->mds_lock
);
1435 if (mds
->is_daemon_stopping()) {
1438 logger
->inc(l_mdl_replayed
);
1443 logger
->set(l_mdl_rdpos
, pos
);
1448 ceph_assert(journaler
->get_read_pos() == journaler
->get_write_pos());
1449 dout(10) << "_replay - complete, " << num_events
1450 << " events" << dendl
;
1452 logger
->set(l_mdl_expos
, journaler
->get_expire_pos());
1455 safe_pos
= journaler
->get_write_safe_pos();
1457 dout(10) << "_replay_thread kicking waiters" << dendl
;
1459 std::lock_guard
l(mds
->mds_lock
);
1460 if (mds
->is_daemon_stopping()) {
1463 finish_contexts(g_ceph_context
, waitfor_replay
, r
);
1466 dout(10) << "_replay_thread finish" << dendl
;
1469 void MDLog::standby_trim_segments()
1471 dout(10) << "standby_trim_segments" << dendl
;
1472 uint64_t expire_pos
= journaler
->get_expire_pos();
1473 dout(10) << " expire_pos=" << expire_pos
<< dendl
;
1475 mds
->mdcache
->open_file_table
.trim_destroyed_inos(expire_pos
);
1477 bool removed_segment
= false;
1478 while (have_any_segments()) {
1479 LogSegment
*seg
= get_oldest_segment();
1480 dout(10) << " segment seq=" << seg
->seq
<< " " << seg
->offset
<<
1481 "~" << seg
->end
- seg
->offset
<< dendl
;
1483 if (seg
->end
> expire_pos
) {
1484 dout(10) << " won't remove, not expired!" << dendl
;
1488 if (segments
.size() == 1) {
1489 dout(10) << " won't remove, last segment!" << dendl
;
1493 dout(10) << " removing segment" << dendl
;
1494 mds
->mdcache
->standby_trim_segment(seg
);
1495 remove_oldest_segment();
1496 removed_segment
= true;
1499 if (removed_segment
) {
1500 dout(20) << " calling mdcache->trim!" << dendl
;
1501 mds
->mdcache
->trim();
1503 dout(20) << " removed no segments!" << dendl
;
1507 void MDLog::dump_replay_status(Formatter
*f
) const
1509 f
->open_object_section("replay_status");
1510 f
->dump_unsigned("journal_read_pos", journaler
? journaler
->get_read_pos() : 0);
1511 f
->dump_unsigned("journal_write_pos", journaler
? journaler
->get_write_pos() : 0);
1512 f
->dump_unsigned("journal_expire_pos", journaler
? journaler
->get_expire_pos() : 0);
1513 f
->dump_unsigned("num_events", get_num_events());
1514 f
->dump_unsigned("num_segments", get_num_segments());