+++ /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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