--- /dev/null
+// -*- 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) 2012 Red Hat
+ *
+ * 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 "common/dout.h"
+#include "common/HeartbeatMap.h"
+
+#include "include/stringify.h"
+#include "include/util.h"
+
+#include "messages/MMDSBeacon.h"
+#include "mon/MonClient.h"
+#include "mds/MDLog.h"
+#include "mds/MDSRank.h"
+#include "mds/MDSMap.h"
+#include "mds/Locker.h"
+
+#include "Beacon.h"
+
+#define dout_context g_ceph_context
+#define dout_subsys ceph_subsys_mds
+#undef dout_prefix
+#define dout_prefix *_dout << "mds.beacon." << name << ' '
+
+
+Beacon::Beacon(CephContext *cct_, MonClient *monc_, std::string name_) :
+ Dispatcher(cct_), lock("Beacon"), monc(monc_), timer(g_ceph_context, lock),
+ name(name_), standby_for_rank(MDS_RANK_NONE),
+ standby_for_fscid(FS_CLUSTER_ID_NONE), want_state(MDSMap::STATE_BOOT),
+ awaiting_seq(-1)
+{
+ last_seq = 0;
+ was_laggy = false;
+
+ epoch = 0;
+}
+
+
+Beacon::~Beacon()
+{
+}
+
+
+void Beacon::init(MDSMap const *mdsmap)
+{
+ Mutex::Locker l(lock);
+ assert(mdsmap != NULL);
+
+ _notify_mdsmap(mdsmap);
+ standby_for_rank = mds_rank_t(g_conf->mds_standby_for_rank);
+ standby_for_name = g_conf->mds_standby_for_name;
+ standby_for_fscid = fs_cluster_id_t(g_conf->mds_standby_for_fscid);
+ standby_replay = g_conf->mds_standby_replay;
+
+ // Spawn threads and start messaging
+ timer.init();
+ _send();
+}
+
+
+void Beacon::shutdown()
+{
+ Mutex::Locker l(lock);
+ if (sender) {
+ timer.cancel_event(sender);
+ sender = NULL;
+ }
+ timer.shutdown();
+}
+
+
+bool Beacon::ms_dispatch(Message *m)
+{
+ if (m->get_type() == MSG_MDS_BEACON) {
+ if (m->get_connection()->get_peer_type() == CEPH_ENTITY_TYPE_MON) {
+ handle_mds_beacon(static_cast<MMDSBeacon*>(m));
+ }
+ return true;
+ }
+
+ return false;
+}
+
+
+/**
+ * Update lagginess state based on response from remote MDSMonitor
+ *
+ * This function puts the passed message before returning
+ */
+void Beacon::handle_mds_beacon(MMDSBeacon *m)
+{
+ Mutex::Locker l(lock);
+ assert(m != NULL);
+
+ version_t seq = m->get_seq();
+
+ // update lab
+ if (seq_stamp.count(seq)) {
+ utime_t now = ceph_clock_now();
+ if (seq_stamp[seq] > last_acked_stamp) {
+ last_acked_stamp = seq_stamp[seq];
+ utime_t rtt = now - last_acked_stamp;
+
+ dout(10) << "handle_mds_beacon " << ceph_mds_state_name(m->get_state())
+ << " seq " << m->get_seq() << " rtt " << rtt << dendl;
+
+ if (was_laggy && rtt < g_conf->mds_beacon_grace) {
+ dout(0) << "handle_mds_beacon no longer laggy" << dendl;
+ was_laggy = false;
+ laggy_until = now;
+ }
+ } else {
+ // Mark myself laggy if system clock goes backwards. Hopping
+ // later beacons will clear it.
+ dout(1) << "handle_mds_beacon system clock goes backwards, "
+ << "mark myself laggy" << dendl;
+ last_acked_stamp = now - utime_t(g_conf->mds_beacon_grace + 1, 0);
+ was_laggy = true;
+ }
+
+ // clean up seq_stamp map
+ while (!seq_stamp.empty() &&
+ seq_stamp.begin()->first <= seq)
+ seq_stamp.erase(seq_stamp.begin());
+
+ // Wake a waiter up if present
+ if (awaiting_seq == seq) {
+ waiting_cond.Signal();
+ }
+ } else {
+ dout(10) << "handle_mds_beacon " << ceph_mds_state_name(m->get_state())
+ << " seq " << m->get_seq() << " dne" << dendl;
+ }
+}
+
+
+void Beacon::send()
+{
+ Mutex::Locker l(lock);
+ _send();
+}
+
+
+void Beacon::send_and_wait(const double duration)
+{
+ Mutex::Locker l(lock);
+ _send();
+ awaiting_seq = last_seq;
+ dout(20) << __func__ << ": awaiting " << awaiting_seq
+ << " for up to " << duration << "s" << dendl;
+
+ utime_t timeout;
+ timeout.set_from_double(ceph_clock_now() + duration);
+ while ((!seq_stamp.empty() && seq_stamp.begin()->first <= awaiting_seq)
+ && ceph_clock_now() < timeout) {
+ waiting_cond.WaitUntil(lock, timeout);
+ }
+
+ awaiting_seq = -1;
+}
+
+
+/**
+ * Call periodically, or when you have updated the desired state
+ */
+void Beacon::_send()
+{
+ if (sender) {
+ timer.cancel_event(sender);
+ }
+ sender = timer.add_event_after(
+ g_conf->mds_beacon_interval,
+ new FunctionContext([this](int) {
+ assert(lock.is_locked_by_me());
+ sender = nullptr;
+ _send();
+ }));
+
+ if (!cct->get_heartbeat_map()->is_healthy()) {
+ /* If anything isn't progressing, let avoid sending a beacon so that
+ * the MDS will consider us laggy */
+ dout(1) << __func__ << " skipping beacon, heartbeat map not healthy" << dendl;
+ return;
+ }
+
+ ++last_seq;
+ dout(10) << __func__ << " " << ceph_mds_state_name(want_state)
+ << " seq " << last_seq
+ << dendl;
+
+ seq_stamp[last_seq] = ceph_clock_now();
+
+ assert(want_state != MDSMap::STATE_NULL);
+
+ MMDSBeacon *beacon = new MMDSBeacon(
+ monc->get_fsid(), mds_gid_t(monc->get_global_id()),
+ name,
+ epoch,
+ want_state,
+ last_seq,
+ CEPH_FEATURES_SUPPORTED_DEFAULT);
+
+ beacon->set_standby_for_rank(standby_for_rank);
+ beacon->set_standby_for_name(standby_for_name);
+ beacon->set_standby_for_fscid(standby_for_fscid);
+ beacon->set_standby_replay(standby_replay);
+ beacon->set_health(health);
+ beacon->set_compat(compat);
+ // piggyback the sys info on beacon msg
+ if (want_state == MDSMap::STATE_BOOT) {
+ map<string, string> sys_info;
+ collect_sys_info(&sys_info, cct);
+ sys_info["addr"] = stringify(monc->get_myaddr());
+ beacon->set_sys_info(sys_info);
+ }
+ monc->send_mon_message(beacon);
+}
+
+/**
+ * Call this when there is a new MDSMap available
+ */
+void Beacon::notify_mdsmap(MDSMap const *mdsmap)
+{
+ Mutex::Locker l(lock);
+ assert(mdsmap != NULL);
+
+ _notify_mdsmap(mdsmap);
+}
+
+void Beacon::_notify_mdsmap(MDSMap const *mdsmap)
+{
+ assert(mdsmap != NULL);
+ assert(mdsmap->get_epoch() >= epoch);
+
+ if (mdsmap->get_epoch() != epoch) {
+ epoch = mdsmap->get_epoch();
+ compat = get_mdsmap_compat_set_default();
+ compat.merge(mdsmap->compat);
+ }
+}
+
+
+bool Beacon::is_laggy()
+{
+ Mutex::Locker l(lock);
+
+ if (last_acked_stamp == utime_t())
+ return false;
+
+ utime_t now = ceph_clock_now();
+ utime_t since = now - last_acked_stamp;
+ if (since > g_conf->mds_beacon_grace) {
+ dout(5) << "is_laggy " << since << " > " << g_conf->mds_beacon_grace
+ << " since last acked beacon" << dendl;
+ was_laggy = true;
+ if (since > (g_conf->mds_beacon_grace*2) &&
+ now > last_mon_reconnect + g_conf->mds_beacon_interval) {
+ // maybe it's not us?
+ dout(5) << "initiating monitor reconnect; maybe we're not the slow one"
+ << dendl;
+ last_mon_reconnect = now;
+ monc->reopen_session();
+ }
+ return true;
+ }
+ return false;
+}
+
+utime_t Beacon::get_laggy_until() const
+{
+ Mutex::Locker l(lock);
+
+ return laggy_until;
+}
+
+void Beacon::set_want_state(MDSMap const *mdsmap, MDSMap::DaemonState const newstate)
+{
+ Mutex::Locker l(lock);
+
+ // Update mdsmap epoch atomically with updating want_state, so that when
+ // we send a beacon with the new want state it has the latest epoch, and
+ // once we have updated to the latest epoch, we are not sending out
+ // a stale want_state (i.e. one from before making it through MDSMap
+ // handling)
+ _notify_mdsmap(mdsmap);
+
+ if (want_state != newstate) {
+ dout(10) << __func__ << ": "
+ << ceph_mds_state_name(want_state) << " -> "
+ << ceph_mds_state_name(newstate) << dendl;
+ want_state = newstate;
+ }
+}
+
+
+/**
+ * We are 'shown' an MDS briefly in order to update
+ * some health metrics that we will send in the next
+ * beacon.
+ */
+void Beacon::notify_health(MDSRank const *mds)
+{
+ Mutex::Locker l(lock);
+ if (!mds) {
+ // No MDS rank held
+ return;
+ }
+
+ // I'm going to touch this MDS, so it must be locked
+ assert(mds->mds_lock.is_locked_by_me());
+
+ health.metrics.clear();
+
+ // Detect presence of entries in DamageTable
+ if (!mds->damage_table.empty()) {
+ MDSHealthMetric m(MDS_HEALTH_DAMAGE, HEALTH_ERR, std::string(
+ "Metadata damage detected"));
+ health.metrics.push_back(m);
+ }
+
+ // Detect MDS_HEALTH_TRIM condition
+ // Arbitrary factor of 2, indicates MDS is not trimming promptly
+ {
+ if (mds->mdlog->get_num_segments() > (size_t)(g_conf->mds_log_max_segments * 2)) {
+ std::ostringstream oss;
+ oss << "Behind on trimming (" << mds->mdlog->get_num_segments()
+ << "/" << g_conf->mds_log_max_segments << ")";
+
+ MDSHealthMetric m(MDS_HEALTH_TRIM, HEALTH_WARN, oss.str());
+ m.metadata["num_segments"] = stringify(mds->mdlog->get_num_segments());
+ m.metadata["max_segments"] = stringify(g_conf->mds_log_max_segments);
+ health.metrics.push_back(m);
+ }
+ }
+
+ // Detect clients failing to respond to modifications to capabilities in
+ // CLIENT_CAPS messages.
+ {
+ std::list<client_t> late_clients;
+ mds->locker->get_late_revoking_clients(&late_clients);
+ std::list<MDSHealthMetric> late_cap_metrics;
+
+ for (std::list<client_t>::iterator i = late_clients.begin(); i != late_clients.end(); ++i) {
+
+ // client_t is equivalent to session.info.inst.name.num
+ // Construct an entity_name_t to lookup into SessionMap
+ entity_name_t ename(CEPH_ENTITY_TYPE_CLIENT, i->v);
+ Session const *s = mds->sessionmap.get_session(ename);
+ if (s == NULL) {
+ // Shouldn't happen, but not worth crashing if it does as this is
+ // just health-reporting code.
+ derr << "Client ID without session: " << i->v << dendl;
+ continue;
+ }
+
+ std::ostringstream oss;
+ oss << "Client " << s->get_human_name() << " failing to respond to capability release";
+ MDSHealthMetric m(MDS_HEALTH_CLIENT_LATE_RELEASE, HEALTH_WARN, oss.str());
+ m.metadata["client_id"] = stringify(i->v);
+ late_cap_metrics.push_back(m);
+ }
+
+ if (late_cap_metrics.size() <= (size_t)g_conf->mds_health_summarize_threshold) {
+ health.metrics.splice(health.metrics.end(), late_cap_metrics);
+ } else {
+ std::ostringstream oss;
+ oss << "Many clients (" << late_cap_metrics.size()
+ << ") failing to respond to capability release";
+ MDSHealthMetric m(MDS_HEALTH_CLIENT_LATE_RELEASE_MANY, HEALTH_WARN, oss.str());
+ m.metadata["client_count"] = stringify(late_cap_metrics.size());
+ health.metrics.push_back(m);
+ late_cap_metrics.clear();
+ }
+ }
+
+ // Detect clients failing to generate cap releases from CEPH_SESSION_RECALL_STATE
+ // messages. May be due to buggy client or resource-hogging application.
+ //
+ // Detect clients failing to advance their old_client_tid
+ {
+ set<Session*> sessions;
+ mds->sessionmap.get_client_session_set(sessions);
+
+ utime_t cutoff = ceph_clock_now();
+ cutoff -= g_conf->mds_recall_state_timeout;
+ utime_t last_recall = mds->mdcache->last_recall_state;
+
+ std::list<MDSHealthMetric> late_recall_metrics;
+ std::list<MDSHealthMetric> large_completed_requests_metrics;
+ for (set<Session*>::iterator i = sessions.begin(); i != sessions.end(); ++i) {
+ Session *session = *i;
+ if (!session->recalled_at.is_zero()) {
+ dout(20) << "Session servicing RECALL " << session->info.inst
+ << ": " << session->recalled_at << " " << session->recall_release_count
+ << "/" << session->recall_count << dendl;
+ if (last_recall < cutoff || session->last_recall_sent < last_recall) {
+ dout(20) << " no longer recall" << dendl;
+ session->clear_recalled_at();
+ } else if (session->recalled_at < cutoff) {
+ dout(20) << " exceeded timeout " << session->recalled_at << " vs. " << cutoff << dendl;
+ std::ostringstream oss;
+ oss << "Client " << session->get_human_name() << " failing to respond to cache pressure";
+ MDSHealthMetric m(MDS_HEALTH_CLIENT_RECALL, HEALTH_WARN, oss.str());
+ m.metadata["client_id"] = stringify(session->info.inst.name.num());
+ late_recall_metrics.push_back(m);
+ } else {
+ dout(20) << " within timeout " << session->recalled_at << " vs. " << cutoff << dendl;
+ }
+ }
+ if ((session->get_num_trim_requests_warnings() > 0 &&
+ session->get_num_completed_requests() >= g_conf->mds_max_completed_requests) ||
+ (session->get_num_trim_flushes_warnings() > 0 &&
+ session->get_num_completed_flushes() >= g_conf->mds_max_completed_flushes)) {
+ std::ostringstream oss;
+ oss << "Client " << session->get_human_name() << " failing to advance its oldest client/flush tid";
+ MDSHealthMetric m(MDS_HEALTH_CLIENT_OLDEST_TID, HEALTH_WARN, oss.str());
+ m.metadata["client_id"] = stringify(session->info.inst.name.num());
+ large_completed_requests_metrics.push_back(m);
+ }
+ }
+
+ if (late_recall_metrics.size() <= (size_t)g_conf->mds_health_summarize_threshold) {
+ health.metrics.splice(health.metrics.end(), late_recall_metrics);
+ } else {
+ std::ostringstream oss;
+ oss << "Many clients (" << late_recall_metrics.size()
+ << ") failing to respond to cache pressure";
+ MDSHealthMetric m(MDS_HEALTH_CLIENT_RECALL_MANY, HEALTH_WARN, oss.str());
+ m.metadata["client_count"] = stringify(late_recall_metrics.size());
+ health.metrics.push_back(m);
+ late_recall_metrics.clear();
+ }
+
+ if (large_completed_requests_metrics.size() <= (size_t)g_conf->mds_health_summarize_threshold) {
+ health.metrics.splice(health.metrics.end(), large_completed_requests_metrics);
+ } else {
+ std::ostringstream oss;
+ oss << "Many clients (" << large_completed_requests_metrics.size()
+ << ") failing to advance their oldest client/flush tid";
+ MDSHealthMetric m(MDS_HEALTH_CLIENT_OLDEST_TID_MANY, HEALTH_WARN, oss.str());
+ m.metadata["client_count"] = stringify(large_completed_requests_metrics.size());
+ health.metrics.push_back(m);
+ large_completed_requests_metrics.clear();
+ }
+ }
+
+ // Detect MDS_HEALTH_SLOW_REQUEST condition
+ {
+ int slow = mds->get_mds_slow_req_count();
+ dout(20) << slow << " slow request found" << dendl;
+ if (slow) {
+ std::ostringstream oss;
+ oss << slow << " slow requests are blocked > " << g_conf->mds_op_complaint_time << " sec";
+
+ MDSHealthMetric m(MDS_HEALTH_SLOW_REQUEST, HEALTH_WARN, oss.str());
+ health.metrics.push_back(m);
+ }
+ }
+
+ // Report a health warning if we are readonly
+ if (mds->mdcache->is_readonly()) {
+ MDSHealthMetric m(MDS_HEALTH_READ_ONLY, HEALTH_WARN,
+ "MDS in read-only mode");
+ health.metrics.push_back(m);
+ }
+
+ // Report if we have significantly exceeded our cache size limit
+ if (mds->mdcache->cache_overfull()) {
+ std::ostringstream oss;
+ oss << "MDS cache is too large (" << bytes2str(mds->mdcache->cache_size())
+ << "/" << bytes2str(mds->mdcache->cache_limit_memory()) << "); "
+ << mds->mdcache->num_inodes_with_caps << " inodes in use by clients, "
+ << mds->mdcache->get_num_strays() << " stray files";
+
+ MDSHealthMetric m(MDS_HEALTH_CACHE_OVERSIZED, HEALTH_WARN, oss.str());
+ health.metrics.push_back(m);
+ }
+}
+
+MDSMap::DaemonState Beacon::get_want_state() const
+{
+ Mutex::Locker l(lock);
+ return want_state;
+}
+
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