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-rw-r--r--src/mon/MDSMonitor.cc2102
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diff --git a/src/mon/MDSMonitor.cc b/src/mon/MDSMonitor.cc
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+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software
+ * Foundation. See file COPYING.
+ *
+ */
+
+#include <regex>
+#include <sstream>
+#include <boost/utility.hpp>
+
+#include "MDSMonitor.h"
+#include "FSCommands.h"
+#include "Monitor.h"
+#include "MonitorDBStore.h"
+#include "OSDMonitor.h"
+
+#include "common/strtol.h"
+#include "common/perf_counters.h"
+#include "common/config.h"
+#include "common/cmdparse.h"
+#include "messages/MMDSMap.h"
+#include "messages/MFSMap.h"
+#include "messages/MFSMapUser.h"
+#include "messages/MMDSLoadTargets.h"
+#include "messages/MMonCommand.h"
+#include "messages/MGenericMessage.h"
+
+#include "include/ceph_assert.h"
+#include "include/str_list.h"
+#include "include/stringify.h"
+#include "mds/mdstypes.h"
+#include "Session.h"
+
+#define dout_subsys ceph_subsys_mon
+#undef dout_prefix
+#define dout_prefix _prefix(_dout, mon, get_fsmap())
+static ostream& _prefix(std::ostream *_dout, Monitor *mon, const FSMap& fsmap) {
+ return *_dout << "mon." << mon->name << "@" << mon->rank
+ << "(" << mon->get_state_name()
+ << ").mds e" << fsmap.get_epoch() << " ";
+}
+
+static const string MDS_METADATA_PREFIX("mds_metadata");
+static const string MDS_HEALTH_PREFIX("mds_health");
+
+
+/*
+ * Specialized implementation of cmd_getval to allow us to parse
+ * out strongly-typedef'd types
+ */
+template<> bool cmd_getval(CephContext *cct, const cmdmap_t& cmdmap,
+ const std::string& k, mds_gid_t &val)
+{
+ return cmd_getval(cct, cmdmap, k, (int64_t&)val);
+}
+
+template<> bool cmd_getval(CephContext *cct, const cmdmap_t& cmdmap,
+ const std::string& k, mds_rank_t &val)
+{
+ return cmd_getval(cct, cmdmap, k, (int64_t&)val);
+}
+
+template<> bool cmd_getval(CephContext *cct, const cmdmap_t& cmdmap,
+ const std::string& k, MDSMap::DaemonState &val)
+{
+ return cmd_getval(cct, cmdmap, k, (int64_t&)val);
+}
+
+// my methods
+
+template <int dblV>
+void MDSMonitor::print_map(const FSMap& m)
+{
+ dout(dblV) << "print_map\n";
+ m.print(*_dout);
+ *_dout << dendl;
+}
+
+// service methods
+void MDSMonitor::create_initial()
+{
+ dout(10) << "create_initial" << dendl;
+}
+
+void MDSMonitor::get_store_prefixes(std::set<string>& s) const
+{
+ s.insert(service_name);
+ s.insert(MDS_METADATA_PREFIX);
+ s.insert(MDS_HEALTH_PREFIX);
+}
+
+void MDSMonitor::update_from_paxos(bool *need_bootstrap)
+{
+ version_t version = get_last_committed();
+ if (version == get_fsmap().epoch)
+ return;
+
+ dout(10) << __func__ << " version " << version
+ << ", my e " << get_fsmap().epoch << dendl;
+ ceph_assert(version > get_fsmap().epoch);
+
+ load_health();
+
+ // read and decode
+ bufferlist fsmap_bl;
+ fsmap_bl.clear();
+ int err = get_version(version, fsmap_bl);
+ ceph_assert(err == 0);
+
+ ceph_assert(fsmap_bl.length() > 0);
+ dout(10) << __func__ << " got " << version << dendl;
+ PaxosFSMap::decode(fsmap_bl);
+
+ // new map
+ dout(0) << "new map" << dendl;
+ print_map<0>(get_fsmap());
+ if (!g_conf()->mon_mds_skip_sanity) {
+ get_fsmap().sanity();
+ }
+
+ check_subs();
+}
+
+void MDSMonitor::init()
+{
+ (void)load_metadata(pending_metadata);
+}
+
+void MDSMonitor::create_pending()
+{
+ auto &fsmap = PaxosFSMap::create_pending();
+
+ if (mon->osdmon()->is_readable()) {
+ const auto &osdmap = mon->osdmon()->osdmap;
+ fsmap.sanitize([&osdmap](int64_t pool){return osdmap.have_pg_pool(pool);});
+ }
+
+ dout(10) << "create_pending e" << fsmap.epoch << dendl;
+}
+
+void MDSMonitor::encode_pending(MonitorDBStore::TransactionRef t)
+{
+ auto &pending = get_pending_fsmap_writeable();
+ auto &epoch = pending.epoch;
+
+ dout(10) << "encode_pending e" << epoch << dendl;
+
+ // print map iff 'debug mon = 30' or higher
+ print_map<30>(pending);
+ if (!g_conf()->mon_mds_skip_sanity) {
+ pending.sanity();
+ }
+
+ // Set 'modified' on maps modified this epoch
+ for (auto &p : pending.filesystems) {
+ if (p.second->mds_map.epoch == epoch) {
+ p.second->mds_map.modified = ceph_clock_now();
+ }
+ }
+
+ // apply to paxos
+ ceph_assert(get_last_committed() + 1 == pending.epoch);
+ bufferlist pending_bl;
+ pending.encode(pending_bl, mon->get_quorum_con_features());
+
+ /* put everything in the transaction */
+ put_version(t, pending.epoch, pending_bl);
+ put_last_committed(t, pending.epoch);
+
+ // Encode MDSHealth data
+ for (std::map<uint64_t, MDSHealth>::iterator i = pending_daemon_health.begin();
+ i != pending_daemon_health.end(); ++i) {
+ bufferlist bl;
+ i->second.encode(bl);
+ t->put(MDS_HEALTH_PREFIX, stringify(i->first), bl);
+ }
+
+ for (std::set<uint64_t>::iterator i = pending_daemon_health_rm.begin();
+ i != pending_daemon_health_rm.end(); ++i) {
+ t->erase(MDS_HEALTH_PREFIX, stringify(*i));
+ }
+ pending_daemon_health_rm.clear();
+ remove_from_metadata(pending, t);
+
+ // health
+ health_check_map_t new_checks;
+ const auto &info_map = pending.get_mds_info();
+ for (const auto &i : info_map) {
+ const auto &gid = i.first;
+ const auto &info = i.second;
+ if (pending_daemon_health_rm.count(gid)) {
+ continue;
+ }
+ MDSHealth health;
+ auto p = pending_daemon_health.find(gid);
+ if (p != pending_daemon_health.end()) {
+ health = p->second;
+ } else {
+ bufferlist bl;
+ mon->store->get(MDS_HEALTH_PREFIX, stringify(gid), bl);
+ if (!bl.length()) {
+ derr << "Missing health data for MDS " << gid << dendl;
+ continue;
+ }
+ auto bl_i = bl.cbegin();
+ health.decode(bl_i);
+ }
+ for (const auto &metric : health.metrics) {
+ const int rank = info.rank;
+ health_check_t *check = &new_checks.get_or_add(
+ mds_metric_name(metric.type),
+ metric.sev,
+ mds_metric_summary(metric.type));
+ ostringstream ss;
+ ss << "mds." << info.name << "(mds." << rank << "): " << metric.message;
+ bool first = true;
+ for (auto &p : metric.metadata) {
+ if (first) {
+ ss << " ";
+ } else {
+ ss << ", ";
+ }
+ ss << p.first << ": " << p.second;
+ first = false;
+ }
+ check->detail.push_back(ss.str());
+ }
+ }
+ pending.get_health_checks(&new_checks);
+ for (auto& p : new_checks.checks) {
+ p.second.summary = std::regex_replace(
+ p.second.summary,
+ std::regex("%num%"),
+ stringify(p.second.detail.size()));
+ p.second.summary = std::regex_replace(
+ p.second.summary,
+ std::regex("%plurals%"),
+ p.second.detail.size() > 1 ? "s" : "");
+ p.second.summary = std::regex_replace(
+ p.second.summary,
+ std::regex("%isorare%"),
+ p.second.detail.size() > 1 ? "are" : "is");
+ p.second.summary = std::regex_replace(
+ p.second.summary,
+ std::regex("%hasorhave%"),
+ p.second.detail.size() > 1 ? "have" : "has");
+ }
+ encode_health(new_checks, t);
+}
+
+version_t MDSMonitor::get_trim_to() const
+{
+ version_t floor = 0;
+ if (g_conf()->mon_mds_force_trim_to > 0 &&
+ g_conf()->mon_mds_force_trim_to < (int)get_last_committed()) {
+ floor = g_conf()->mon_mds_force_trim_to;
+ dout(10) << __func__ << " explicit mon_mds_force_trim_to = "
+ << floor << dendl;
+ }
+
+ unsigned max = g_conf()->mon_max_mdsmap_epochs;
+ version_t last = get_last_committed();
+
+ if (last - get_first_committed() > max && floor < last - max)
+ return last - max;
+ return floor;
+}
+
+bool MDSMonitor::preprocess_query(MonOpRequestRef op)
+{
+ op->mark_mdsmon_event(__func__);
+ PaxosServiceMessage *m = static_cast<PaxosServiceMessage*>(op->get_req());
+ dout(10) << "preprocess_query " << *m << " from " << m->get_orig_source()
+ << " " << m->get_orig_source_addrs() << dendl;
+
+ switch (m->get_type()) {
+
+ case MSG_MDS_BEACON:
+ return preprocess_beacon(op);
+
+ case MSG_MON_COMMAND:
+ try {
+ return preprocess_command(op);
+ } catch (const bad_cmd_get& e) {
+ bufferlist bl;
+ mon->reply_command(op, -EINVAL, e.what(), bl, get_last_committed());
+ return true;
+ }
+
+ case MSG_MDS_OFFLOAD_TARGETS:
+ return preprocess_offload_targets(op);
+
+ default:
+ ceph_abort();
+ return true;
+ }
+}
+
+void MDSMonitor::_note_beacon(MMDSBeacon *m)
+{
+ mds_gid_t gid = mds_gid_t(m->get_global_id());
+ version_t seq = m->get_seq();
+
+ dout(5) << "_note_beacon " << *m << " noting time" << dendl;
+ auto &beacon = last_beacon[gid];
+ beacon.stamp = mono_clock::now();
+ beacon.seq = seq;
+}
+
+bool MDSMonitor::preprocess_beacon(MonOpRequestRef op)
+{
+ op->mark_mdsmon_event(__func__);
+ MMDSBeacon *m = static_cast<MMDSBeacon*>(op->get_req());
+ MDSMap::DaemonState state = m->get_state();
+ mds_gid_t gid = m->get_global_id();
+ version_t seq = m->get_seq();
+ MDSMap::mds_info_t info;
+ epoch_t effective_epoch = 0;
+
+ const auto &fsmap = get_fsmap();
+
+ // check privileges, ignore if fails
+ MonSession *session = op->get_session();
+ if (!session)
+ goto ignore;
+ if (!session->is_capable("mds", MON_CAP_X)) {
+ dout(0) << "preprocess_beacon got MMDSBeacon from entity with insufficient privileges "
+ << session->caps << dendl;
+ goto ignore;
+ }
+
+ if (m->get_fsid() != mon->monmap->fsid) {
+ dout(0) << "preprocess_beacon on fsid " << m->get_fsid() << " != " << mon->monmap->fsid << dendl;
+ goto ignore;
+ }
+
+ dout(5) << "preprocess_beacon " << *m
+ << " from " << m->get_orig_source()
+ << " " << m->get_orig_source_addrs()
+ << " " << m->get_compat()
+ << dendl;
+
+ // make sure the address has a port
+ if (m->get_orig_source_addr().get_port() == 0) {
+ dout(1) << " ignoring boot message without a port" << dendl;
+ goto ignore;
+ }
+
+ // check compat
+ if (!m->get_compat().writeable(fsmap.compat)) {
+ dout(1) << " mds " << m->get_orig_source()
+ << " " << m->get_orig_source_addrs()
+ << " can't write to fsmap " << fsmap.compat << dendl;
+ goto ignore;
+ }
+
+ // fw to leader?
+ if (!is_leader())
+ return false;
+
+ // booted, but not in map?
+ if (!fsmap.gid_exists(gid)) {
+ if (state != MDSMap::STATE_BOOT) {
+ dout(7) << "mds_beacon " << *m << " is not in fsmap (state "
+ << ceph_mds_state_name(state) << ")" << dendl;
+
+ /* We can't send an MDSMap this MDS was a part of because we no longer
+ * know which FS it was part of. Nor does this matter. Sending an empty
+ * MDSMap is sufficient for getting the MDS to respawn.
+ */
+ MDSMap null_map;
+ null_map.epoch = fsmap.epoch;
+ null_map.compat = fsmap.compat;
+ auto m = MMDSMap::create(mon->monmap->fsid, null_map);
+ mon->send_reply(op, m.detach());
+ return true;
+ } else {
+ return false; // not booted yet.
+ }
+ }
+ dout(10) << __func__ << ": GID exists in map: " << gid << dendl;
+ info = fsmap.get_info_gid(gid);
+
+ if (state == MDSMap::STATE_DNE) {
+ return false;
+ }
+
+ // old seq?
+ if (info.state_seq > seq) {
+ dout(7) << "mds_beacon " << *m << " has old seq, ignoring" << dendl;
+ goto ignore;
+ }
+
+ // Work out the latest epoch that this daemon should have seen
+ {
+ fs_cluster_id_t fscid = fsmap.mds_roles.at(gid);
+ if (fscid == FS_CLUSTER_ID_NONE) {
+ effective_epoch = fsmap.standby_epochs.at(gid);
+ } else {
+ effective_epoch = fsmap.get_filesystem(fscid)->mds_map.epoch;
+ }
+ if (effective_epoch != m->get_last_epoch_seen()) {
+ dout(10) << "mds_beacon " << *m
+ << " ignoring requested state, because mds hasn't seen latest map" << dendl;
+ goto reply;
+ }
+ }
+
+ if (info.laggy()) {
+ _note_beacon(m);
+ return false; // no longer laggy, need to update map.
+ }
+ if (state == MDSMap::STATE_BOOT) {
+ // ignore, already booted.
+ goto ignore;
+ }
+ // is there a state change here?
+ if (info.state != state) {
+ // legal state change?
+ if ((info.state == MDSMap::STATE_STANDBY ||
+ info.state == MDSMap::STATE_STANDBY_REPLAY) && state > 0) {
+ dout(10) << "mds_beacon mds can't activate itself (" << ceph_mds_state_name(info.state)
+ << " -> " << ceph_mds_state_name(state) << ")" << dendl;
+ goto reply;
+ }
+
+ if ((state == MDSMap::STATE_STANDBY || state == MDSMap::STATE_STANDBY_REPLAY)
+ && info.rank != MDS_RANK_NONE)
+ {
+ dout(4) << "mds_beacon MDS can't go back into standby after taking rank: "
+ "held rank " << info.rank << " while requesting state "
+ << ceph_mds_state_name(state) << dendl;
+ goto reply;
+ }
+
+ _note_beacon(m);
+ return false;
+ }
+
+ // Comparing known daemon health with m->get_health()
+ // and return false (i.e. require proposal) if they
+ // do not match, to update our stored
+ if (!(pending_daemon_health[gid] == m->get_health())) {
+ dout(10) << __func__ << " health metrics for gid " << gid << " were updated" << dendl;
+ _note_beacon(m);
+ return false;
+ }
+
+ reply:
+ // note time and reply
+ ceph_assert(effective_epoch > 0);
+ _note_beacon(m);
+ {
+ auto beacon = MMDSBeacon::create(mon->monmap->fsid,
+ m->get_global_id(), m->get_name(), effective_epoch,
+ state, seq, CEPH_FEATURES_SUPPORTED_DEFAULT);
+ mon->send_reply(op, beacon.detach());
+ }
+ return true;
+
+ ignore:
+ // I won't reply this beacon, drop it.
+ mon->no_reply(op);
+ return true;
+}
+
+bool MDSMonitor::preprocess_offload_targets(MonOpRequestRef op)
+{
+ op->mark_mdsmon_event(__func__);
+ MMDSLoadTargets *m = static_cast<MMDSLoadTargets*>(op->get_req());
+ dout(10) << "preprocess_offload_targets " << *m << " from " << m->get_orig_source() << dendl;
+
+ const auto &fsmap = get_fsmap();
+
+ // check privileges, ignore message if fails
+ MonSession *session = op->get_session();
+ if (!session)
+ goto ignore;
+ if (!session->is_capable("mds", MON_CAP_X)) {
+ dout(0) << "preprocess_offload_targets got MMDSLoadTargets from entity with insufficient caps "
+ << session->caps << dendl;
+ goto ignore;
+ }
+
+ if (fsmap.gid_exists(m->global_id) &&
+ m->targets == fsmap.get_info_gid(m->global_id).export_targets)
+ goto ignore;
+
+ return false;
+
+ ignore:
+ mon->no_reply(op);
+ return true;
+}
+
+
+bool MDSMonitor::prepare_update(MonOpRequestRef op)
+{
+ op->mark_mdsmon_event(__func__);
+ PaxosServiceMessage *m = static_cast<PaxosServiceMessage*>(op->get_req());
+ dout(7) << "prepare_update " << *m << dendl;
+
+ switch (m->get_type()) {
+
+ case MSG_MDS_BEACON:
+ return prepare_beacon(op);
+
+ case MSG_MON_COMMAND:
+ try {
+ return prepare_command(op);
+ } catch (const bad_cmd_get& e) {
+ bufferlist bl;
+ mon->reply_command(op, -EINVAL, e.what(), bl, get_last_committed());
+ return true;
+ }
+
+ case MSG_MDS_OFFLOAD_TARGETS:
+ return prepare_offload_targets(op);
+
+ default:
+ ceph_abort();
+ }
+
+ return true;
+}
+
+bool MDSMonitor::prepare_beacon(MonOpRequestRef op)
+{
+ op->mark_mdsmon_event(__func__);
+ MMDSBeacon *m = static_cast<MMDSBeacon*>(op->get_req());
+ // -- this is an update --
+ dout(12) << "prepare_beacon " << *m << " from " << m->get_orig_source()
+ << " " << m->get_orig_source_addrs() << dendl;
+ entity_addrvec_t addrs = m->get_orig_source_addrs();
+ mds_gid_t gid = m->get_global_id();
+ MDSMap::DaemonState state = m->get_state();
+ version_t seq = m->get_seq();
+
+ auto &pending = get_pending_fsmap_writeable();
+
+ dout(15) << __func__ << " got health from gid " << gid << " with " << m->get_health().metrics.size() << " metrics." << dendl;
+
+ // Calculate deltas of health metrics created and removed
+ // Do this by type rather than MDSHealthMetric equality, because messages can
+ // change a lot when they include e.g. a number of items.
+ const auto &old_health = pending_daemon_health[gid].metrics;
+ const auto &new_health = m->get_health().metrics;
+
+ std::set<mds_metric_t> old_types;
+ for (const auto &i : old_health) {
+ old_types.insert(i.type);
+ }
+
+ std::set<mds_metric_t> new_types;
+ for (const auto &i : new_health) {
+ new_types.insert(i.type);
+ }
+
+ for (const auto &new_metric: new_health) {
+ if (old_types.count(new_metric.type) == 0) {
+ dout(10) << "MDS health message (" << m->get_orig_source()
+ << "): " << new_metric.sev << " " << new_metric.message << dendl;
+ }
+ }
+
+ // Log the disappearance of health messages at INFO
+ for (const auto &old_metric : old_health) {
+ if (new_types.count(old_metric.type) == 0) {
+ mon->clog->info() << "MDS health message cleared ("
+ << m->get_orig_source() << "): " << old_metric.message;
+ }
+ }
+
+ // Store health
+ pending_daemon_health[gid] = m->get_health();
+
+ // boot?
+ if (state == MDSMap::STATE_BOOT) {
+ // zap previous instance of this name?
+ if (g_conf()->mds_enforce_unique_name) {
+ bool failed_mds = false;
+ while (mds_gid_t existing = pending.find_mds_gid_by_name(m->get_name())) {
+ if (!mon->osdmon()->is_writeable()) {
+ mon->osdmon()->wait_for_writeable(op, new C_RetryMessage(this, op));
+ return false;
+ }
+ const MDSMap::mds_info_t &existing_info =
+ pending.get_info_gid(existing);
+ mon->clog->info() << existing_info.human_name() << " restarted";
+ fail_mds_gid(pending, existing);
+ failed_mds = true;
+ }
+ if (failed_mds) {
+ ceph_assert(mon->osdmon()->is_writeable());
+ request_proposal(mon->osdmon());
+ }
+ }
+
+ // Add this daemon to the map
+ if (pending.mds_roles.count(gid) == 0) {
+ MDSMap::mds_info_t new_info;
+ new_info.global_id = gid;
+ new_info.name = m->get_name();
+ new_info.addrs = addrs;
+ new_info.mds_features = m->get_mds_features();
+ new_info.state = MDSMap::STATE_STANDBY;
+ new_info.state_seq = seq;
+ pending.insert(new_info);
+ }
+
+ // initialize the beacon timer
+ auto &beacon = last_beacon[gid];
+ beacon.stamp = mono_clock::now();
+ beacon.seq = seq;
+
+ // new incompat?
+ if (!pending.compat.writeable(m->get_compat())) {
+ dout(10) << " fsmap " << pending.compat
+ << " can't write to new mds' " << m->get_compat()
+ << ", updating fsmap and killing old mds's"
+ << dendl;
+ pending.update_compat(m->get_compat());
+ }
+
+ update_metadata(m->get_global_id(), m->get_sys_info());
+ } else {
+ // state update
+
+ if (!pending.gid_exists(gid)) {
+ /* gid has been removed from pending, send null map */
+ dout(5) << "mds_beacon " << *m << " is not in fsmap (state "
+ << ceph_mds_state_name(state) << ")" << dendl;
+
+ /* We can't send an MDSMap this MDS was a part of because we no longer
+ * know which FS it was part of. Nor does this matter. Sending an empty
+ * MDSMap is sufficient for getting the MDS to respawn.
+ */
+ wait_for_finished_proposal(op, new FunctionContext([op, this](int r){
+ if (r >= 0) {
+ const auto& fsmap = get_fsmap();
+ MDSMap null_map;
+ null_map.epoch = fsmap.epoch;
+ null_map.compat = fsmap.compat;
+ auto m = MMDSMap::create(mon->monmap->fsid, null_map);
+ mon->send_reply(op, m.detach());
+ } else {
+ dispatch(op); // try again
+ }
+ }));
+ return true;
+ }
+
+ const auto& info = pending.get_info_gid(gid);
+ if (info.state == MDSMap::STATE_STOPPING &&
+ state != MDSMap::STATE_STOPPING &&
+ state != MDSMap::STATE_STOPPED) {
+ // we can't transition to any other states from STOPPING
+ dout(0) << "got beacon for MDS in STATE_STOPPING, ignoring requested state change"
+ << dendl;
+ _note_beacon(m);
+ return true;
+ }
+
+ if (info.laggy()) {
+ dout(1) << "prepare_beacon clearing laggy flag on " << addrs << dendl;
+ pending.modify_daemon(info.global_id, [](auto& info)
+ {
+ info.clear_laggy();
+ }
+ );
+ }
+
+ dout(5) << "prepare_beacon mds." << info.rank
+ << " " << ceph_mds_state_name(info.state)
+ << " -> " << ceph_mds_state_name(state)
+ << dendl;
+ if (state == MDSMap::STATE_STOPPED) {
+ const auto fscid = pending.mds_roles.at(gid);
+ const auto &fs = pending.get_filesystem(fscid);
+
+ mon->clog->info() << info.human_name() << " finished "
+ << "stopping rank " << info.rank << " in filesystem "
+ << fs->mds_map.fs_name << " (now has "
+ << fs->mds_map.get_num_in_mds() - 1 << " ranks)";
+
+ auto erased = pending.stop(gid);
+ erased.push_back(gid);
+
+ for (const auto &erased_gid : erased) {
+ last_beacon.erase(erased_gid);
+ if (pending_daemon_health.count(erased_gid)) {
+ pending_daemon_health.erase(erased_gid);
+ pending_daemon_health_rm.insert(erased_gid);
+ }
+ }
+
+
+ } else if (state == MDSMap::STATE_DAMAGED) {
+ if (!mon->osdmon()->is_writeable()) {
+ dout(1) << __func__ << ": DAMAGED from rank " << info.rank
+ << " waiting for osdmon writeable to blacklist it" << dendl;
+ mon->osdmon()->wait_for_writeable(op, new C_RetryMessage(this, op));
+ return false;
+ }
+
+ // Record this MDS rank as damaged, so that other daemons
+ // won't try to run it.
+ dout(0) << __func__ << ": marking rank "
+ << info.rank << " damaged" << dendl;
+
+ utime_t until = ceph_clock_now();
+ until += g_conf().get_val<double>("mon_mds_blacklist_interval");
+ const auto blacklist_epoch = mon->osdmon()->blacklist(info.addrs, until);
+ request_proposal(mon->osdmon());
+ pending.damaged(gid, blacklist_epoch);
+ last_beacon.erase(gid);
+
+ // Respond to MDS, so that it knows it can continue to shut down
+ auto beacon = MMDSBeacon::create(
+ mon->monmap->fsid, m->get_global_id(),
+ m->get_name(), pending.get_epoch(), state, seq,
+ CEPH_FEATURES_SUPPORTED_DEFAULT);
+ mon->send_reply(op, beacon.detach());
+ } else if (state == MDSMap::STATE_DNE) {
+ if (!mon->osdmon()->is_writeable()) {
+ dout(1) << __func__ << ": DNE from rank " << info.rank
+ << " waiting for osdmon writeable to blacklist it" << dendl;
+ mon->osdmon()->wait_for_writeable(op, new C_RetryMessage(this, op));
+ return false;
+ }
+
+ fail_mds_gid(pending, gid);
+ ceph_assert(mon->osdmon()->is_writeable());
+ request_proposal(mon->osdmon());
+
+ // Respond to MDS, so that it knows it can continue to shut down
+ auto beacon = MMDSBeacon::create(mon->monmap->fsid,
+ m->get_global_id(), m->get_name(), pending.get_epoch(), state, seq,
+ CEPH_FEATURES_SUPPORTED_DEFAULT);
+ mon->send_reply(op, beacon.detach());
+ } else if (info.state == MDSMap::STATE_STANDBY && state != info.state) {
+ // Standby daemons should never modify their own
+ // state. Reject any attempts to do so.
+ derr << "standby " << gid << " attempted to change state to "
+ << ceph_mds_state_name(state) << ", rejecting" << dendl;
+ return true;
+ } else if (info.state != MDSMap::STATE_STANDBY && state != info.state &&
+ !MDSMap::state_transition_valid(info.state, state)) {
+ // Validate state transitions for daemons that hold a rank
+ derr << "daemon " << gid << " (rank " << info.rank << ") "
+ << "reported invalid state transition "
+ << ceph_mds_state_name(info.state) << " -> "
+ << ceph_mds_state_name(state) << dendl;
+ return true;
+ } else {
+ if (info.state != MDSMap::STATE_ACTIVE && state == MDSMap::STATE_ACTIVE) {
+ const auto &fscid = pending.mds_roles.at(gid);
+ const auto &fs = pending.get_filesystem(fscid);
+ mon->clog->info() << info.human_name() << " is now active in "
+ << "filesystem " << fs->mds_map.fs_name << " as rank "
+ << info.rank;
+ }
+
+ // Made it through special cases and validations, record the
+ // daemon's reported state to the FSMap.
+ pending.modify_daemon(gid, [state, seq](auto& info) {
+ info.state = state;
+ info.state_seq = seq;
+ });
+ }
+ }
+
+ dout(5) << "prepare_beacon pending map now:" << dendl;
+ print_map(pending);
+
+ wait_for_finished_proposal(op, new FunctionContext([op, this](int r){
+ if (r >= 0)
+ _updated(op); // success
+ else if (r == -ECANCELED) {
+ mon->no_reply(op);
+ } else {
+ dispatch(op); // try again
+ }
+ }));
+
+ return true;
+}
+
+bool MDSMonitor::prepare_offload_targets(MonOpRequestRef op)
+{
+ auto &pending = get_pending_fsmap_writeable();
+
+ op->mark_mdsmon_event(__func__);
+ MMDSLoadTargets *m = static_cast<MMDSLoadTargets*>(op->get_req());
+ mds_gid_t gid = m->global_id;
+ if (pending.gid_has_rank(gid)) {
+ dout(10) << "prepare_offload_targets " << gid << " " << m->targets << dendl;
+ pending.update_export_targets(gid, m->targets);
+ } else {
+ dout(10) << "prepare_offload_targets " << gid << " not in map" << dendl;
+ }
+ mon->no_reply(op);
+ return true;
+}
+
+bool MDSMonitor::should_propose(double& delay)
+{
+ // delegate to PaxosService to assess whether we should propose
+ return PaxosService::should_propose(delay);
+}
+
+void MDSMonitor::_updated(MonOpRequestRef op)
+{
+ const auto &fsmap = get_fsmap();
+ op->mark_mdsmon_event(__func__);
+ MMDSBeacon *m = static_cast<MMDSBeacon*>(op->get_req());
+ dout(10) << "_updated " << m->get_orig_source() << " " << *m << dendl;
+ mon->clog->debug() << m->get_orig_source() << " "
+ << m->get_orig_source_addrs() << " "
+ << ceph_mds_state_name(m->get_state());
+
+ if (m->get_state() == MDSMap::STATE_STOPPED) {
+ // send the map manually (they're out of the map, so they won't get it automatic)
+ MDSMap null_map;
+ null_map.epoch = fsmap.epoch;
+ null_map.compat = fsmap.compat;
+ auto m = MMDSMap::create(mon->monmap->fsid, null_map);
+ mon->send_reply(op, m.detach());
+ } else {
+ auto beacon = MMDSBeacon::create(mon->monmap->fsid,
+ m->get_global_id(), m->get_name(), fsmap.get_epoch(),
+ m->get_state(), m->get_seq(), CEPH_FEATURES_SUPPORTED_DEFAULT);
+ mon->send_reply(op, beacon.detach());
+ }
+}
+
+void MDSMonitor::on_active()
+{
+ tick();
+
+ if (is_leader()) {
+ mon->clog->debug() << "fsmap " << get_fsmap();
+ }
+}
+
+void MDSMonitor::dump_info(Formatter *f)
+{
+ f->open_object_section("fsmap");
+ get_fsmap().dump(f);
+ f->close_section();
+
+ f->dump_unsigned("mdsmap_first_committed", get_first_committed());
+ f->dump_unsigned("mdsmap_last_committed", get_last_committed());
+}
+
+bool MDSMonitor::preprocess_command(MonOpRequestRef op)
+{
+ op->mark_mdsmon_event(__func__);
+ MMonCommand *m = static_cast<MMonCommand*>(op->get_req());
+ int r = -1;
+ bufferlist rdata;
+ stringstream ss, ds;
+
+ const auto &fsmap = get_fsmap();
+
+ cmdmap_t cmdmap;
+ if (!cmdmap_from_json(m->cmd, &cmdmap, ss)) {
+ // ss has reason for failure
+ string rs = ss.str();
+ mon->reply_command(op, -EINVAL, rs, rdata, get_last_committed());
+ return true;
+ }
+
+ string prefix;
+ cmd_getval(g_ceph_context, cmdmap, "prefix", prefix);
+ string format;
+ cmd_getval(g_ceph_context, cmdmap, "format", format, string("plain"));
+ std::unique_ptr<Formatter> f(Formatter::create(format));
+
+ MonSession *session = op->get_session();
+ if (!session) {
+ mon->reply_command(op, -EACCES, "access denied", rdata, get_last_committed());
+ return true;
+ }
+
+ if (prefix == "mds stat") {
+ if (f) {
+ f->open_object_section("mds_stat");
+ dump_info(f.get());
+ f->close_section();
+ f->flush(ds);
+ } else {
+ ds << fsmap;
+ }
+ r = 0;
+ } else if (prefix == "mds ok-to-stop") {
+ vector<string> ids;
+ if (!cmd_getval(g_ceph_context, cmdmap, "ids", ids)) {
+ r = -EINVAL;
+ ss << "must specify mds id";
+ goto out;
+ }
+ if (fsmap.is_any_degraded()) {
+ ss << "one or more filesystems is currently degraded";
+ r = -EBUSY;
+ goto out;
+ }
+ set<mds_gid_t> stopping;
+ for (auto& id : ids) {
+ ostringstream ess;
+ mds_gid_t gid = gid_from_arg(fsmap, id, ess);
+ if (gid == MDS_GID_NONE) {
+ // the mds doesn't exist, but no file systems are unhappy, so losing it
+ // can't have any effect.
+ continue;
+ }
+ stopping.insert(gid);
+ }
+ set<mds_gid_t> active;
+ set<mds_gid_t> standby;
+ for (auto gid : stopping) {
+ if (fsmap.gid_has_rank(gid)) {
+ // ignore standby-replay daemons (at this level)
+ if (!fsmap.is_standby_replay(gid)) {
+ auto standby = fsmap.get_standby_replay(gid);
+ if (standby == MDS_GID_NONE ||
+ stopping.count(standby)) {
+ // no standby-replay, or we're also stopping the standby-replay
+ // for this mds
+ active.insert(gid);
+ }
+ }
+ } else {
+ // net loss of a standby
+ standby.insert(gid);
+ }
+ }
+ if (fsmap.get_num_standby() - standby.size() < active.size()) {
+ r = -EBUSY;
+ ss << "insufficent standby MDS daemons to stop active gids "
+ << stringify(active)
+ << " and/or standby gids " << stringify(standby);;
+ goto out;
+ }
+ r = 0;
+ ss << "should be safe to stop " << ids;
+ } else if (prefix == "fs dump") {
+ int64_t epocharg;
+ epoch_t epoch;
+
+ const FSMap *fsmapp = &fsmap;
+ FSMap dummy;
+ if (cmd_getval(g_ceph_context, cmdmap, "epoch", epocharg)) {
+ epoch = epocharg;
+ bufferlist b;
+ int err = get_version(epoch, b);
+ if (err == -ENOENT) {
+ r = -ENOENT;
+ goto out;
+ } else {
+ ceph_assert(err == 0);
+ ceph_assert(b.length());
+ dummy.decode(b);
+ fsmapp = &dummy;
+ }
+ }
+
+ stringstream ds;
+ if (f != NULL) {
+ f->open_object_section("fsmap");
+ fsmapp->dump(f.get());
+ f->close_section();
+ f->flush(ds);
+ r = 0;
+ } else {
+ fsmapp->print(ds);
+ r = 0;
+ }
+
+ rdata.append(ds);
+ ss << "dumped fsmap epoch " << fsmapp->get_epoch();
+ } else if (prefix == "mds metadata") {
+ if (!f)
+ f.reset(Formatter::create("json-pretty"));
+
+ string who;
+ bool all = !cmd_getval(g_ceph_context, cmdmap, "who", who);
+ dout(1) << "all = " << all << dendl;
+ if (all) {
+ r = 0;
+ // Dump all MDSs' metadata
+ const auto all_info = fsmap.get_mds_info();
+
+ f->open_array_section("mds_metadata");
+ for(const auto &i : all_info) {
+ const auto &info = i.second;
+
+ f->open_object_section("mds");
+ f->dump_string("name", info.name);
+ std::ostringstream get_err;
+ r = dump_metadata(fsmap, info.name, f.get(), get_err);
+ if (r == -EINVAL || r == -ENOENT) {
+ // Drop error, list what metadata we do have
+ dout(1) << get_err.str() << dendl;
+ r = 0;
+ } else if (r != 0) {
+ derr << "Unexpected error reading metadata: " << cpp_strerror(r)
+ << dendl;
+ ss << get_err.str();
+ f->close_section();
+ break;
+ }
+ f->close_section();
+ }
+ f->close_section();
+ } else {
+ // Dump a single daemon's metadata
+ f->open_object_section("mds_metadata");
+ r = dump_metadata(fsmap, who, f.get(), ss);
+ f->close_section();
+ }
+ f->flush(ds);
+ } else if (prefix == "mds versions") {
+ if (!f)
+ f.reset(Formatter::create("json-pretty"));
+ count_metadata("ceph_version", f.get());
+ f->flush(ds);
+ r = 0;
+ } else if (prefix == "mds count-metadata") {
+ if (!f)
+ f.reset(Formatter::create("json-pretty"));
+ string field;
+ cmd_getval(g_ceph_context, cmdmap, "property", field);
+ count_metadata(field, f.get());
+ f->flush(ds);
+ r = 0;
+ } else if (prefix == "mds compat show") {
+ if (f) {
+ f->open_object_section("mds_compat");
+ fsmap.compat.dump(f.get());
+ f->close_section();
+ f->flush(ds);
+ } else {
+ ds << fsmap.compat;
+ }
+ r = 0;
+ } else if (prefix == "fs get") {
+ string fs_name;
+ cmd_getval(g_ceph_context, cmdmap, "fs_name", fs_name);
+ const auto &fs = fsmap.get_filesystem(fs_name);
+ if (fs == nullptr) {
+ ss << "filesystem '" << fs_name << "' not found";
+ r = -ENOENT;
+ } else {
+ if (f != nullptr) {
+ f->open_object_section("filesystem");
+ fs->dump(f.get());
+ f->close_section();
+ f->flush(ds);
+ r = 0;
+ } else {
+ fs->print(ds);
+ r = 0;
+ }
+ }
+ } else if (prefix == "fs ls") {
+ if (f) {
+ f->open_array_section("filesystems");
+ for (const auto &p : fsmap.filesystems) {
+ const auto &fs = p.second;
+ f->open_object_section("filesystem");
+ {
+ const MDSMap &mds_map = fs->mds_map;
+ f->dump_string("name", mds_map.fs_name);
+ /* Output both the names and IDs of pools, for use by
+ * humans and machines respectively */
+ f->dump_string("metadata_pool", mon->osdmon()->osdmap.get_pool_name(
+ mds_map.metadata_pool));
+ f->dump_int("metadata_pool_id", mds_map.metadata_pool);
+ f->open_array_section("data_pool_ids");
+ for (const auto &id : mds_map.data_pools) {
+ f->dump_int("data_pool_id", id);
+ }
+ f->close_section();
+
+ f->open_array_section("data_pools");
+ for (const auto &id : mds_map.data_pools) {
+ const auto &name = mon->osdmon()->osdmap.get_pool_name(id);
+ f->dump_string("data_pool", name);
+ }
+ f->close_section();
+ }
+ f->close_section();
+ }
+ f->close_section();
+ f->flush(ds);
+ } else {
+ for (const auto &p : fsmap.filesystems) {
+ const auto &fs = p.second;
+ const MDSMap &mds_map = fs->mds_map;
+ const string &md_pool_name = mon->osdmon()->osdmap.get_pool_name(
+ mds_map.metadata_pool);
+
+ ds << "name: " << mds_map.fs_name << ", metadata pool: "
+ << md_pool_name << ", data pools: [";
+ for (const auto &id : mds_map.data_pools) {
+ const string &pool_name = mon->osdmon()->osdmap.get_pool_name(id);
+ ds << pool_name << " ";
+ }
+ ds << "]" << std::endl;
+ }
+
+ if (fsmap.filesystems.empty()) {
+ ds << "No filesystems enabled" << std::endl;
+ }
+ }
+ r = 0;
+ }
+
+out:
+ if (r != -1) {
+ rdata.append(ds);
+ string rs;
+ getline(ss, rs);
+ mon->reply_command(op, r, rs, rdata, get_last_committed());
+ return true;
+ } else
+ return false;
+}
+
+bool MDSMonitor::fail_mds_gid(FSMap &fsmap, mds_gid_t gid)
+{
+ const MDSMap::mds_info_t &info = fsmap.get_info_gid(gid);
+ dout(1) << "fail_mds_gid " << gid << " mds." << info.name << " role " << info.rank << dendl;
+
+ ceph_assert(mon->osdmon()->is_writeable());
+
+ epoch_t blacklist_epoch = 0;
+ if (info.rank >= 0 && info.state != MDSMap::STATE_STANDBY_REPLAY) {
+ utime_t until = ceph_clock_now();
+ until += g_conf().get_val<double>("mon_mds_blacklist_interval");
+ blacklist_epoch = mon->osdmon()->blacklist(info.addrs, until);
+ }
+
+ fsmap.erase(gid, blacklist_epoch);
+ last_beacon.erase(gid);
+ if (pending_daemon_health.count(gid)) {
+ pending_daemon_health.erase(gid);
+ pending_daemon_health_rm.insert(gid);
+ }
+
+ return blacklist_epoch != 0;
+}
+
+mds_gid_t MDSMonitor::gid_from_arg(const FSMap &fsmap, const std::string &arg, std::ostream &ss)
+{
+ // Try parsing as a role
+ mds_role_t role;
+ std::ostringstream ignore_err; // Don't spam 'ss' with parse_role errors
+ int r = fsmap.parse_role(arg, &role, ignore_err);
+ if (r == 0) {
+ // See if a GID is assigned to this role
+ const auto &fs = fsmap.get_filesystem(role.fscid);
+ ceph_assert(fs != nullptr); // parse_role ensures it exists
+ if (fs->mds_map.is_up(role.rank)) {
+ dout(10) << __func__ << ": validated rank/GID " << role
+ << " as a rank" << dendl;
+ return fs->mds_map.get_mds_info(role.rank).global_id;
+ }
+ }
+
+ // Try parsing as a gid
+ std::string err;
+ unsigned long long maybe_gid = strict_strtoll(arg.c_str(), 10, &err);
+ if (!err.empty()) {
+ // Not a role or a GID, try as a daemon name
+ const MDSMap::mds_info_t *mds_info = fsmap.find_by_name(arg);
+ if (!mds_info) {
+ ss << "MDS named '" << arg
+ << "' does not exist, or is not up";
+ return MDS_GID_NONE;
+ }
+ dout(10) << __func__ << ": resolved MDS name '" << arg
+ << "' to GID " << mds_info->global_id << dendl;
+ return mds_info->global_id;
+ } else {
+ // Not a role, but parses as a an integer, might be a GID
+ dout(10) << __func__ << ": treating MDS reference '" << arg
+ << "' as an integer " << maybe_gid << dendl;
+
+ if (fsmap.gid_exists(mds_gid_t(maybe_gid))) {
+ return mds_gid_t(maybe_gid);
+ }
+ }
+
+ dout(1) << __func__ << ": rank/GID " << arg
+ << " not a existent rank or GID" << dendl;
+ return MDS_GID_NONE;
+}
+
+int MDSMonitor::fail_mds(FSMap &fsmap, std::ostream &ss,
+ const std::string &arg, MDSMap::mds_info_t *failed_info)
+{
+ ceph_assert(failed_info != nullptr);
+
+ mds_gid_t gid = gid_from_arg(fsmap, arg, ss);
+ if (gid == MDS_GID_NONE) {
+ return 0;
+ }
+ if (!mon->osdmon()->is_writeable()) {
+ return -EAGAIN;
+ }
+
+ // Take a copy of the info before removing the MDS from the map,
+ // so that the caller knows which mds (if any) they ended up removing.
+ *failed_info = fsmap.get_info_gid(gid);
+
+ fail_mds_gid(fsmap, gid);
+ ss << "failed mds gid " << gid;
+ ceph_assert(mon->osdmon()->is_writeable());
+ request_proposal(mon->osdmon());
+ return 0;
+}
+
+bool MDSMonitor::prepare_command(MonOpRequestRef op)
+{
+ op->mark_mdsmon_event(__func__);
+ MMonCommand *m = static_cast<MMonCommand*>(op->get_req());
+ int r = -EINVAL;
+ stringstream ss;
+ bufferlist rdata;
+
+ cmdmap_t cmdmap;
+ if (!cmdmap_from_json(m->cmd, &cmdmap, ss)) {
+ string rs = ss.str();
+ mon->reply_command(op, -EINVAL, rs, rdata, get_last_committed());
+ return true;
+ }
+
+ string prefix;
+ cmd_getval(g_ceph_context, cmdmap, "prefix", prefix);
+
+ /* Refuse access if message not associated with a valid session */
+ MonSession *session = op->get_session();
+ if (!session) {
+ mon->reply_command(op, -EACCES, "access denied", rdata, get_last_committed());
+ return true;
+ }
+
+ auto &pending = get_pending_fsmap_writeable();
+
+ bool batched_propose = false;
+ for (const auto &h : handlers) {
+ if (h->can_handle(prefix)) {
+ batched_propose = h->batched_propose();
+ if (batched_propose) {
+ paxos->plug();
+ }
+ r = h->handle(mon, pending, op, cmdmap, ss);
+ if (batched_propose) {
+ paxos->unplug();
+ }
+
+ if (r == -EAGAIN) {
+ // message has been enqueued for retry; return.
+ dout(4) << __func__ << " enqueue for retry by prepare_command" << dendl;
+ return false;
+ } else {
+ if (r == 0) {
+ // On successful updates, print the updated map
+ print_map(pending);
+ }
+ // Successful or not, we're done: respond.
+ goto out;
+ }
+ }
+ }
+
+ r = filesystem_command(pending, op, prefix, cmdmap, ss);
+ if (r >= 0) {
+ goto out;
+ } else if (r == -EAGAIN) {
+ // Do not reply, the message has been enqueued for retry
+ dout(4) << __func__ << " enqueue for retry by filesystem_command" << dendl;
+ return false;
+ } else if (r != -ENOSYS) {
+ goto out;
+ }
+
+ if (r == -ENOSYS && ss.str().empty()) {
+ ss << "unrecognized command";
+ }
+
+out:
+ dout(4) << __func__ << " done, r=" << r << dendl;
+ /* Compose response */
+ string rs;
+ getline(ss, rs);
+
+ if (r >= 0) {
+ // success.. delay reply
+ wait_for_finished_proposal(op, new Monitor::C_Command(mon, op, r, rs,
+ get_last_committed() + 1));
+ if (batched_propose) {
+ force_immediate_propose();
+ }
+ return true;
+ } else {
+ // reply immediately
+ mon->reply_command(op, r, rs, rdata, get_last_committed());
+ return false;
+ }
+}
+
+int MDSMonitor::filesystem_command(
+ FSMap &fsmap,
+ MonOpRequestRef op,
+ std::string const &prefix,
+ const cmdmap_t& cmdmap,
+ std::stringstream &ss)
+{
+ dout(4) << __func__ << " prefix='" << prefix << "'" << dendl;
+ op->mark_mdsmon_event(__func__);
+ int r = 0;
+ string whostr;
+ cmd_getval(g_ceph_context, cmdmap, "role", whostr);
+
+ if (prefix == "mds set_state") {
+ mds_gid_t gid;
+ if (!cmd_getval(g_ceph_context, cmdmap, "gid", gid)) {
+ ss << "error parsing 'gid' value '"
+ << cmd_vartype_stringify(cmdmap.at("gid")) << "'";
+ return -EINVAL;
+ }
+ MDSMap::DaemonState state;
+ if (!cmd_getval(g_ceph_context, cmdmap, "state", state)) {
+ ss << "error parsing 'state' string value '"
+ << cmd_vartype_stringify(cmdmap.at("state")) << "'";
+ return -EINVAL;
+ }
+ if (fsmap.gid_exists(gid)) {
+ fsmap.modify_daemon(gid, [state](auto& info) {
+ info.state = state;
+ });
+ ss << "set mds gid " << gid << " to state " << state << " "
+ << ceph_mds_state_name(state);
+ return 0;
+ }
+ } else if (prefix == "mds fail") {
+ string who;
+ cmd_getval(g_ceph_context, cmdmap, "role_or_gid", who);
+
+ MDSMap::mds_info_t failed_info;
+ r = fail_mds(fsmap, ss, who, &failed_info);
+ if (r < 0 && r == -EAGAIN) {
+ mon->osdmon()->wait_for_writeable(op, new C_RetryMessage(this, op));
+ return -EAGAIN; // don't propose yet; wait for message to be retried
+ } else if (r == 0) {
+ // Only log if we really did something (not when was already gone)
+ if (failed_info.global_id != MDS_GID_NONE) {
+ mon->clog->info() << failed_info.human_name() << " marked failed by "
+ << op->get_session()->entity_name;
+ }
+ }
+ } else if (prefix == "mds rm") {
+ mds_gid_t gid;
+ if (!cmd_getval(g_ceph_context, cmdmap, "gid", gid)) {
+ ss << "error parsing 'gid' value '"
+ << cmd_vartype_stringify(cmdmap.at("gid")) << "'";
+ return -EINVAL;
+ }
+ if (!fsmap.gid_exists(gid)) {
+ ss << "mds gid " << gid << " does not exist";
+ r = 0;
+ } else {
+ const auto &info = fsmap.get_info_gid(gid);
+ MDSMap::DaemonState state = info.state;
+ if (state > 0) {
+ ss << "cannot remove active mds." << info.name
+ << " rank " << info.rank;
+ return -EBUSY;
+ } else {
+ fsmap.erase(gid, {});
+ ss << "removed mds gid " << gid;
+ return 0;
+ }
+ }
+ } else if (prefix == "mds rmfailed") {
+ bool confirm = false;
+ cmd_getval(g_ceph_context, cmdmap, "yes_i_really_mean_it", confirm);
+ if (!confirm) {
+ ss << "WARNING: this can make your filesystem inaccessible! "
+ "Add --yes-i-really-mean-it if you are sure you wish to continue.";
+ return -EPERM;
+ }
+
+ std::string role_str;
+ cmd_getval(g_ceph_context, cmdmap, "role", role_str);
+ mds_role_t role;
+ int r = fsmap.parse_role(role_str, &role, ss);
+ if (r < 0) {
+ ss << "invalid role '" << role_str << "'";
+ return -EINVAL;
+ }
+
+ fsmap.modify_filesystem(
+ role.fscid,
+ [role](std::shared_ptr<Filesystem> fs)
+ {
+ fs->mds_map.failed.erase(role.rank);
+ });
+
+ ss << "removed failed mds." << role;
+ return 0;
+ } else if (prefix == "mds compat rm_compat") {
+ int64_t f;
+ if (!cmd_getval(g_ceph_context, cmdmap, "feature", f)) {
+ ss << "error parsing feature value '"
+ << cmd_vartype_stringify(cmdmap.at("feature")) << "'";
+ return -EINVAL;
+ }
+ if (fsmap.compat.compat.contains(f)) {
+ ss << "removing compat feature " << f;
+ CompatSet modified = fsmap.compat;
+ modified.compat.remove(f);
+ fsmap.update_compat(modified);
+ } else {
+ ss << "compat feature " << f << " not present in " << fsmap.compat;
+ }
+ r = 0;
+ } else if (prefix == "mds compat rm_incompat") {
+ int64_t f;
+ if (!cmd_getval(g_ceph_context, cmdmap, "feature", f)) {
+ ss << "error parsing feature value '"
+ << cmd_vartype_stringify(cmdmap.at("feature")) << "'";
+ return -EINVAL;
+ }
+ if (fsmap.compat.incompat.contains(f)) {
+ ss << "removing incompat feature " << f;
+ CompatSet modified = fsmap.compat;
+ modified.incompat.remove(f);
+ fsmap.update_compat(modified);
+ } else {
+ ss << "incompat feature " << f << " not present in " << fsmap.compat;
+ }
+ r = 0;
+ } else if (prefix == "mds repaired") {
+ std::string role_str;
+ cmd_getval(g_ceph_context, cmdmap, "role", role_str);
+ mds_role_t role;
+ r = fsmap.parse_role(role_str, &role, ss);
+ if (r < 0) {
+ return r;
+ }
+
+ bool modified = fsmap.undamaged(role.fscid, role.rank);
+ if (modified) {
+ ss << "repaired: restoring rank " << role;
+ } else {
+ ss << "nothing to do: rank is not damaged";
+ }
+
+ r = 0;
+ } else if (prefix == "mds freeze") {
+ std::string who;
+ cmd_getval(g_ceph_context, cmdmap, "role_or_gid", who);
+ mds_gid_t gid = gid_from_arg(fsmap, who, ss);
+ if (gid == MDS_GID_NONE) {
+ return -EINVAL;
+ }
+
+ bool freeze = false;
+ {
+ std::string str;
+ cmd_getval(g_ceph_context, cmdmap, "val", str);
+ if ((r = parse_bool(str, &freeze, ss)) != 0) {
+ return r;
+ }
+ }
+
+ auto f = [freeze,gid,&ss](auto& info) {
+ if (freeze) {
+ ss << "freezing mds." << gid;
+ info.freeze();
+ } else {
+ ss << "unfreezing mds." << gid;
+ info.unfreeze();
+ }
+ };
+ fsmap.modify_daemon(gid, f);
+ r = 0;
+ } else {
+ return -ENOSYS;
+ }
+
+ return r;
+}
+
+void MDSMonitor::check_subs()
+{
+ std::list<std::string> types;
+
+ // Subscriptions may be to "mdsmap" (MDS and legacy clients),
+ // "mdsmap.<namespace>", or to "fsmap" for the full state of all
+ // filesystems. Build a list of all the types we service
+ // subscriptions for.
+ types.push_back("fsmap");
+ types.push_back("fsmap.user");
+ types.push_back("mdsmap");
+ for (const auto &p : get_fsmap().filesystems) {
+ const auto &fscid = p.first;
+ std::ostringstream oss;
+ oss << "mdsmap." << fscid;
+ types.push_back(oss.str());
+ }
+
+ for (const auto &type : types) {
+ if (mon->session_map.subs.count(type) == 0)
+ continue;
+ xlist<Subscription*>::iterator p = mon->session_map.subs[type]->begin();
+ while (!p.end()) {
+ Subscription *sub = *p;
+ ++p;
+ check_sub(sub);
+ }
+ }
+}
+
+
+void MDSMonitor::check_sub(Subscription *sub)
+{
+ dout(20) << __func__ << ": " << sub->type << dendl;
+
+ const auto &fsmap = get_fsmap();
+
+ if (sub->type == "fsmap") {
+ if (sub->next <= fsmap.get_epoch()) {
+ sub->session->con->send_message(new MFSMap(mon->monmap->fsid, fsmap));
+ if (sub->onetime) {
+ mon->session_map.remove_sub(sub);
+ } else {
+ sub->next = fsmap.get_epoch() + 1;
+ }
+ }
+ } else if (sub->type == "fsmap.user") {
+ if (sub->next <= fsmap.get_epoch()) {
+ FSMapUser fsmap_u;
+ fsmap_u.epoch = fsmap.get_epoch();
+ fsmap_u.legacy_client_fscid = fsmap.legacy_client_fscid;
+ for (const auto &p : fsmap.filesystems) {
+ FSMapUser::fs_info_t& fs_info = fsmap_u.filesystems[p.second->fscid];
+ fs_info.cid = p.second->fscid;
+ fs_info.name = p.second->mds_map.fs_name;
+ }
+ sub->session->con->send_message(new MFSMapUser(mon->monmap->fsid, fsmap_u));
+ if (sub->onetime) {
+ mon->session_map.remove_sub(sub);
+ } else {
+ sub->next = fsmap.get_epoch() + 1;
+ }
+ }
+ } else if (sub->type.compare(0, 6, "mdsmap") == 0) {
+ if (sub->next > fsmap.get_epoch()) {
+ return;
+ }
+
+ const bool is_mds = sub->session->name.is_mds();
+ mds_gid_t mds_gid = MDS_GID_NONE;
+ fs_cluster_id_t fscid = FS_CLUSTER_ID_NONE;
+ if (is_mds) {
+ // What (if any) namespace are you assigned to?
+ auto mds_info = fsmap.get_mds_info();
+ for (const auto &p : mds_info) {
+ if (p.second.addrs == sub->session->addrs) {
+ mds_gid = p.first;
+ fscid = fsmap.mds_roles.at(mds_gid);
+ }
+ }
+ } else {
+ // You're a client. Did you request a particular
+ // namespace?
+ if (sub->type.compare(0, 7, "mdsmap.") == 0) {
+ auto namespace_id_str = sub->type.substr(std::string("mdsmap.").size());
+ dout(10) << __func__ << ": namespace_id " << namespace_id_str << dendl;
+ std::string err;
+ fscid = strict_strtoll(namespace_id_str.c_str(), 10, &err);
+ if (!err.empty()) {
+ // Client asked for a non-existent namespace, send them nothing
+ dout(1) << "Invalid client subscription '" << sub->type
+ << "'" << dendl;
+ return;
+ }
+ if (fsmap.filesystems.count(fscid) == 0) {
+ // Client asked for a non-existent namespace, send them nothing
+ // TODO: something more graceful for when a client has a filesystem
+ // mounted, and the fileysstem is deleted. Add a "shut down you fool"
+ // flag to MMDSMap?
+ dout(1) << "Client subscribed to non-existent namespace '" <<
+ fscid << "'" << dendl;
+ return;
+ }
+ } else {
+ // Unqualified request for "mdsmap": give it the one marked
+ // for use by legacy clients.
+ if (fsmap.legacy_client_fscid != FS_CLUSTER_ID_NONE) {
+ fscid = fsmap.legacy_client_fscid;
+ } else {
+ dout(1) << "Client subscribed for legacy filesystem but "
+ "none is configured" << dendl;
+ return;
+ }
+ }
+ }
+ dout(10) << __func__ << ": is_mds=" << is_mds << ", fscid= " << fscid << dendl;
+
+ // Work out the effective latest epoch
+ const MDSMap *mds_map = nullptr;
+ MDSMap null_map;
+ null_map.compat = fsmap.compat;
+ if (fscid == FS_CLUSTER_ID_NONE) {
+ // For a client, we should have already dropped out
+ ceph_assert(is_mds);
+
+ auto it = fsmap.standby_daemons.find(mds_gid);
+ if (it != fsmap.standby_daemons.end()) {
+ // For an MDS, we need to feed it an MDSMap with its own state in
+ null_map.mds_info[mds_gid] = it->second;
+ null_map.epoch = fsmap.standby_epochs.at(mds_gid);
+ } else {
+ null_map.epoch = fsmap.epoch;
+ }
+ mds_map = &null_map;
+ } else {
+ // Check the effective epoch
+ mds_map = &fsmap.get_filesystem(fscid)->mds_map;
+ }
+
+ ceph_assert(mds_map != nullptr);
+ dout(10) << __func__ << " selected MDS map epoch " <<
+ mds_map->epoch << " for namespace " << fscid << " for subscriber "
+ << sub->session->name << " who wants epoch " << sub->next << dendl;
+
+ if (sub->next > mds_map->epoch) {
+ return;
+ }
+ auto msg = MMDSMap::create(mon->monmap->fsid, *mds_map);
+
+ sub->session->con->send_message(msg.detach());
+ if (sub->onetime) {
+ mon->session_map.remove_sub(sub);
+ } else {
+ sub->next = mds_map->get_epoch() + 1;
+ }
+ }
+}
+
+
+void MDSMonitor::update_metadata(mds_gid_t gid,
+ const map<string, string>& metadata)
+{
+ if (metadata.empty()) {
+ return;
+ }
+ pending_metadata[gid] = metadata;
+
+ MonitorDBStore::TransactionRef t = paxos->get_pending_transaction();
+ bufferlist bl;
+ encode(pending_metadata, bl);
+ t->put(MDS_METADATA_PREFIX, "last_metadata", bl);
+ paxos->trigger_propose();
+}
+
+void MDSMonitor::remove_from_metadata(const FSMap &fsmap, MonitorDBStore::TransactionRef t)
+{
+ bool update = false;
+ for (auto it = pending_metadata.begin(); it != pending_metadata.end(); ) {
+ if (!fsmap.gid_exists(it->first)) {
+ it = pending_metadata.erase(it);
+ update = true;
+ } else {
+ ++it;
+ }
+ }
+ if (!update)
+ return;
+ bufferlist bl;
+ encode(pending_metadata, bl);
+ t->put(MDS_METADATA_PREFIX, "last_metadata", bl);
+}
+
+int MDSMonitor::load_metadata(map<mds_gid_t, Metadata>& m)
+{
+ bufferlist bl;
+ int r = mon->store->get(MDS_METADATA_PREFIX, "last_metadata", bl);
+ if (r) {
+ dout(5) << "Unable to load 'last_metadata'" << dendl;
+ return r;
+ }
+
+ auto it = bl.cbegin();
+ ceph::decode(m, it);
+ return 0;
+}
+
+void MDSMonitor::count_metadata(const std::string &field, map<string,int> *out)
+{
+ map<mds_gid_t,Metadata> meta;
+ load_metadata(meta);
+ for (auto& p : meta) {
+ auto q = p.second.find(field);
+ if (q == p.second.end()) {
+ (*out)["unknown"]++;
+ } else {
+ (*out)[q->second]++;
+ }
+ }
+}
+
+void MDSMonitor::count_metadata(const std::string &field, Formatter *f)
+{
+ map<string,int> by_val;
+ count_metadata(field, &by_val);
+ f->open_object_section(field.c_str());
+ for (auto& p : by_val) {
+ f->dump_int(p.first.c_str(), p.second);
+ }
+ f->close_section();
+}
+
+int MDSMonitor::dump_metadata(const FSMap& fsmap, const std::string &who,
+ Formatter *f, ostream& err)
+{
+ ceph_assert(f);
+
+ mds_gid_t gid = gid_from_arg(fsmap, who, err);
+ if (gid == MDS_GID_NONE) {
+ return -EINVAL;
+ }
+
+ map<mds_gid_t, Metadata> metadata;
+ if (int r = load_metadata(metadata)) {
+ err << "Unable to load 'last_metadata'";
+ return r;
+ }
+
+ if (!metadata.count(gid)) {
+ return -ENOENT;
+ }
+ const Metadata& m = metadata[gid];
+ for (Metadata::const_iterator p = m.begin(); p != m.end(); ++p) {
+ f->dump_string(p->first.c_str(), p->second);
+ }
+ return 0;
+}
+
+int MDSMonitor::print_nodes(Formatter *f)
+{
+ ceph_assert(f);
+
+ const auto &fsmap = get_fsmap();
+
+ map<mds_gid_t, Metadata> metadata;
+ if (int r = load_metadata(metadata)) {
+ return r;
+ }
+
+ map<string, list<string> > mdses; // hostname => mds
+ for (const auto &p : metadata) {
+ const mds_gid_t& gid = p.first;
+ const Metadata& m = p.second;
+ Metadata::const_iterator hostname = m.find("hostname");
+ if (hostname == m.end()) {
+ // not likely though
+ continue;
+ }
+ if (!fsmap.gid_exists(gid)) {
+ dout(5) << __func__ << ": GID " << gid << " not existent" << dendl;
+ continue;
+ }
+ const MDSMap::mds_info_t& mds_info = fsmap.get_info_gid(gid);
+ mdses[hostname->second].push_back(mds_info.name);
+ }
+
+ dump_services(f, mdses, "mds");
+ return 0;
+}
+
+/**
+ * If a cluster is undersized (with respect to max_mds), then
+ * attempt to find daemons to grow it. If the cluster is oversized
+ * (with respect to max_mds) then shrink it by stopping its highest rank.
+ */
+bool MDSMonitor::maybe_resize_cluster(FSMap &fsmap, fs_cluster_id_t fscid)
+{
+ auto &current_mds_map = get_fsmap().get_filesystem(fscid)->mds_map;
+ auto&& fs = fsmap.get_filesystem(fscid);
+ auto &mds_map = fs->mds_map;
+
+ int in = mds_map.get_num_in_mds();
+ int max = mds_map.get_max_mds();
+
+ dout(20) << __func__ << " in " << in << " max " << max << dendl;
+
+ /* Check that both the current epoch mds_map is resizeable as well as the
+ * current batch of changes in pending. This is important if an MDS is
+ * becoming active in the next epoch.
+ */
+ if (!current_mds_map.is_resizeable() ||
+ !mds_map.is_resizeable()) {
+ dout(5) << __func__ << " mds_map is not currently resizeable" << dendl;
+ return false;
+ }
+
+ if (in < max && !mds_map.test_flag(CEPH_MDSMAP_NOT_JOINABLE)) {
+ mds_rank_t mds = mds_rank_t(0);
+ string name;
+ while (mds_map.is_in(mds)) {
+ mds++;
+ }
+ auto&& newgid = fsmap.find_replacement_for({fscid, mds}, name);
+ if (newgid == MDS_GID_NONE) {
+ return false;
+ }
+
+ const auto &new_info = fsmap.get_info_gid(newgid);
+ dout(1) << "assigned standby " << new_info.addrs
+ << " as mds." << mds << dendl;
+
+ mon->clog->info() << new_info.human_name() << " assigned to "
+ "filesystem " << mds_map.fs_name << " as rank "
+ << mds << " (now has " << mds_map.get_num_in_mds() + 1
+ << " ranks)";
+ fsmap.promote(newgid, *fs, mds);
+ return true;
+ } else if (in > max) {
+ mds_rank_t target = in - 1;
+ const auto &info = mds_map.get_info(target);
+ if (mds_map.is_active(target)) {
+ dout(1) << "stopping " << target << dendl;
+ mon->clog->info() << "stopping " << info.human_name();
+ auto f = [](auto& info) {
+ info.state = MDSMap::STATE_STOPPING;
+ };
+ fsmap.modify_daemon(info.global_id, f);
+ return true;
+ } else {
+ dout(20) << "skipping stop of " << target << dendl;
+ return false;
+ }
+ }
+
+ return false;
+}
+
+
+/**
+ * If a daemon is laggy, and a suitable replacement
+ * is available, fail this daemon (remove from map) and pass its
+ * role to another daemon.
+ */
+void MDSMonitor::maybe_replace_gid(FSMap &fsmap, mds_gid_t gid,
+ const MDSMap::mds_info_t& info, bool *mds_propose, bool *osd_propose)
+{
+ ceph_assert(mds_propose != nullptr);
+ ceph_assert(osd_propose != nullptr);
+
+ const auto fscid = fsmap.mds_roles.at(gid);
+
+ // We will only take decisive action (replacing/removing a daemon)
+ // if we have some indicating that some other daemon(s) are successfully
+ // getting beacons through recently.
+ mono_time latest_beacon = mono_clock::zero();
+ for (const auto &p : last_beacon) {
+ latest_beacon = std::max(p.second.stamp, latest_beacon);
+ }
+ mono_time now = mono_clock::now();
+ chrono::duration<double> since = now-latest_beacon;
+ const bool frozen = info.is_frozen();
+ const bool may_replace = since.count() <
+ std::max(g_conf()->mds_beacon_interval, g_conf()->mds_beacon_grace * 0.5);
+
+ // are we in?
+ // and is there a non-laggy standby that can take over for us?
+ mds_gid_t sgid;
+ if (info.rank >= 0 &&
+ info.state != MDSMap::STATE_STANDBY &&
+ info.state != MDSMap::STATE_STANDBY_REPLAY &&
+ may_replace &&
+ !frozen &&
+ !fsmap.get_filesystem(fscid)->mds_map.test_flag(CEPH_MDSMAP_NOT_JOINABLE) &&
+ (sgid = fsmap.find_replacement_for({fscid, info.rank}, info.name)) != MDS_GID_NONE)
+ {
+
+ MDSMap::mds_info_t si = fsmap.get_info_gid(sgid);
+ dout(1) << " replacing " << gid << " " << info.addrs
+ << " mds." << info.rank << "." << info.inc
+ << " " << ceph_mds_state_name(info.state)
+ << " with " << sgid << "/" << si.name << " " << si.addrs
+ << dendl;
+
+ mon->clog->warn() << info.human_name()
+ << " is not responding, replacing it "
+ << "as rank " << info.rank
+ << " with standby " << si.human_name();
+
+ // Remember what NS the old one was in
+ const fs_cluster_id_t fscid = fsmap.mds_roles.at(gid);
+
+ // Remove the old one
+ *osd_propose |= fail_mds_gid(fsmap, gid);
+
+ // Promote the replacement
+ auto&& fs = fsmap.filesystems.at(fscid);
+ fsmap.promote(sgid, *fs, info.rank);
+
+ *mds_propose = true;
+ } else if ((info.state == MDSMap::STATE_STANDBY_REPLAY ||
+ info.state == MDSMap::STATE_STANDBY) && may_replace && !frozen) {
+ dout(1) << " failing and removing " << gid << " " << info.addrs
+ << " mds." << info.rank
+ << "." << info.inc << " " << ceph_mds_state_name(info.state)
+ << dendl;
+ mon->clog->info() << "Standby " << info.human_name() << " is not "
+ "responding, dropping it";
+ fail_mds_gid(fsmap, gid);
+ *mds_propose = true;
+ } else if (!info.laggy()) {
+ dout(1) << " marking " << gid << " " << info.addrs
+ << " mds." << info.rank << "." << info.inc
+ << " " << ceph_mds_state_name(info.state)
+ << " laggy" << dendl;
+ fsmap.modify_daemon(info.global_id, [](auto& info) {
+ info.laggy_since = ceph_clock_now();
+ });
+ *mds_propose = true;
+ }
+}
+
+bool MDSMonitor::maybe_promote_standby(FSMap &fsmap, Filesystem& fs)
+{
+ if (fs.mds_map.test_flag(CEPH_MDSMAP_NOT_JOINABLE)) {
+ return false;
+ }
+
+ bool do_propose = false;
+
+ // have a standby take over?
+ set<mds_rank_t> failed;
+ fs.mds_map.get_failed_mds_set(failed);
+ for (const auto& rank : failed) {
+ auto&& sgid = fsmap.find_replacement_for({fs.fscid, rank}, {});
+ if (sgid) {
+ auto&& info = fsmap.get_info_gid(sgid);
+ dout(1) << " taking over failed mds." << rank << " with " << sgid
+ << "/" << info.name << " " << info.addrs << dendl;
+ mon->clog->info() << "Standby " << info.human_name()
+ << " assigned to filesystem " << fs.mds_map.fs_name
+ << " as rank " << rank;
+
+ fsmap.promote(sgid, fs, rank);
+ do_propose = true;
+ }
+ }
+
+ if (fs.mds_map.allows_standby_replay() && !fs.mds_map.is_degraded()) {
+ // There were no failures to replace, so try using any available standbys
+ // as standby-replay daemons. Don't do this when the cluster is degraded
+ // as a standby-replay daemon may try to read a journal being migrated.
+ for (;;) {
+ auto standby_gid = fsmap.get_available_standby();
+ if (standby_gid == MDS_GID_NONE) break;
+ dout(20) << "standby available mds." << standby_gid << dendl;
+ bool changed = false;
+ for (const auto& rank : fs.mds_map.in) {
+ dout(20) << "exmaining " << rank << dendl;
+ if (fs.mds_map.is_followable(rank)) {
+ dout(1) << " setting mds." << standby_gid
+ << " to follow mds rank " << rank << dendl;
+ fsmap.assign_standby_replay(standby_gid, fs.fscid, rank);
+ do_propose = true;
+ changed = true;
+ break;
+ }
+ }
+ if (!changed) break;
+ }
+ }
+
+ return do_propose;
+}
+
+void MDSMonitor::tick()
+{
+ // make sure mds's are still alive
+ // ...if i am an active leader
+
+ if (!is_active() || !is_leader()) return;
+
+ auto &pending = get_pending_fsmap_writeable();
+
+ bool do_propose = false;
+
+ do_propose |= pending.check_health();
+
+ // resize mds cluster (adjust @in)?
+ for (auto &p : pending.filesystems) {
+ do_propose |= maybe_resize_cluster(pending, p.second->fscid);
+ }
+
+ mono_time now = mono_clock::now();
+ if (mono_clock::is_zero(last_tick)) {
+ last_tick = now;
+ }
+ chrono::duration<double> since_last = now-last_tick;
+
+ if (since_last.count() >
+ (g_conf()->mds_beacon_grace - g_conf()->mds_beacon_interval)) {
+ // This case handles either local slowness (calls being delayed
+ // for whatever reason) or cluster election slowness (a long gap
+ // between calls while an election happened)
+ dout(1) << __func__ << ": resetting beacon timeouts due to mon delay "
+ "(slow election?) of " << now - last_tick << " seconds" << dendl;
+ for (auto &p : last_beacon) {
+ p.second.stamp = now;
+ }
+ }
+
+ last_tick = now;
+
+ // make sure last_beacon is fully populated
+ for (auto &p : pending.mds_roles) {
+ auto &gid = p.first;
+ last_beacon.emplace(std::piecewise_construct,
+ std::forward_as_tuple(gid),
+ std::forward_as_tuple(mono_clock::now(), 0));
+ }
+
+
+ // check beacon timestamps
+ bool propose_osdmap = false;
+ bool osdmap_writeable = mon->osdmon()->is_writeable();
+ for (auto it = last_beacon.begin(); it != last_beacon.end(); ) {
+ mds_gid_t gid = it->first;
+ auto beacon_info = it->second;
+ chrono::duration<double> since_last = now-beacon_info.stamp;
+
+ if (!pending.gid_exists(gid)) {
+ // clean it out
+ it = last_beacon.erase(it);
+ continue;
+ }
+
+
+ if (since_last.count() >= g_conf()->mds_beacon_grace) {
+ auto &info = pending.get_info_gid(gid);
+ dout(1) << "no beacon from mds." << info.rank << "." << info.inc
+ << " (gid: " << gid << " addr: " << info.addrs
+ << " state: " << ceph_mds_state_name(info.state) << ")"
+ << " since " << since_last.count() << "s" << dendl;
+ // If the OSDMap is writeable, we can blacklist things, so we can
+ // try failing any laggy MDS daemons. Consider each one for failure.
+ if (osdmap_writeable) {
+ maybe_replace_gid(pending, gid, info, &do_propose, &propose_osdmap);
+ }
+ }
+
+ ++it;
+ }
+ if (propose_osdmap) {
+ request_proposal(mon->osdmon());
+ }
+
+ for (auto &p : pending.filesystems) {
+ do_propose |= maybe_promote_standby(pending, *p.second);
+ }
+
+ if (do_propose) {
+ propose_pending();
+ }
+}
+
+MDSMonitor::MDSMonitor(Monitor *mn, Paxos *p, string service_name)
+ : PaxosService(mn, p, service_name)
+{
+ handlers = FileSystemCommandHandler::load(p);
+}
+
+void MDSMonitor::on_restart()
+{
+ // Clear out the leader-specific state.
+ last_tick = mono_clock::now();
+ last_beacon.clear();
+}
+
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