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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.
+ *
+ */
+
+/* Metadata Server Monitor
+ */
+
+#ifndef CEPH_MDSMONITOR_H
+#define CEPH_MDSMONITOR_H
+
+#include <map>
+#include <set>
+
+#include "include/types.h"
+#include "PaxosFSMap.h"
+#include "PaxosService.h"
+#include "msg/Messenger.h"
+#include "messages/MMDSBeacon.h"
+#include "CommandHandler.h"
+
+class FileSystemCommandHandler;
+
+class MDSMonitor : public PaxosService, public PaxosFSMap, protected CommandHandler {
+ public:
+ MDSMonitor(Monitor *mn, Paxos *p, string service_name);
+
+ // service methods
+ void create_initial() override;
+ void get_store_prefixes(std::set<string>& s) const override;
+ void update_from_paxos(bool *need_bootstrap) override;
+ void init() override;
+ void create_pending() override;
+ void encode_pending(MonitorDBStore::TransactionRef t) override;
+ // we don't require full versions; don't encode any.
+ void encode_full(MonitorDBStore::TransactionRef t) override { }
+ version_t get_trim_to() const override;
+
+ bool preprocess_query(MonOpRequestRef op) override; // true if processed.
+ bool prepare_update(MonOpRequestRef op) override;
+ bool should_propose(double& delay) override;
+
+ bool should_print_status() const {
+ auto& fs = get_fsmap();
+ auto fs_count = fs.filesystem_count();
+ auto standby_count = fs.get_num_standby();
+ return fs_count > 0 || standby_count > 0;
+ }
+
+ void on_active() override;
+ void on_restart() override;
+
+ void check_subs();
+ void check_sub(Subscription *sub);
+
+ void dump_info(Formatter *f);
+ int print_nodes(Formatter *f);
+
+ /**
+ * Return true if a blacklist was done (i.e. OSD propose needed)
+ */
+ bool fail_mds_gid(FSMap &fsmap, mds_gid_t gid);
+
+ bool is_leader() const override { return mon->is_leader(); }
+
+ protected:
+ // my helpers
+ template<int dblV = 7>
+ void print_map(const FSMap &m);
+
+ void _updated(MonOpRequestRef op);
+
+ void _note_beacon(class MMDSBeacon *m);
+ bool preprocess_beacon(MonOpRequestRef op);
+ bool prepare_beacon(MonOpRequestRef op);
+
+ bool preprocess_offload_targets(MonOpRequestRef op);
+ bool prepare_offload_targets(MonOpRequestRef op);
+
+ int fail_mds(FSMap &fsmap, std::ostream &ss,
+ const std::string &arg,
+ MDSMap::mds_info_t *failed_info);
+
+ bool preprocess_command(MonOpRequestRef op);
+ bool prepare_command(MonOpRequestRef op);
+
+ int filesystem_command(
+ FSMap &fsmap,
+ MonOpRequestRef op,
+ std::string const &prefix,
+ const cmdmap_t& cmdmap,
+ std::stringstream &ss);
+
+ // beacons
+ struct beacon_info_t {
+ mono_time stamp = mono_clock::zero();
+ uint64_t seq = 0;
+ beacon_info_t() {}
+ beacon_info_t(mono_time stamp, uint64_t seq) : stamp(stamp), seq(seq) {}
+ };
+ map<mds_gid_t, beacon_info_t> last_beacon;
+
+ std::list<std::shared_ptr<FileSystemCommandHandler> > handlers;
+
+ bool maybe_promote_standby(FSMap& fsmap, Filesystem& fs);
+ bool maybe_resize_cluster(FSMap &fsmap, fs_cluster_id_t fscid);
+ void maybe_replace_gid(FSMap &fsmap, mds_gid_t gid,
+ const MDSMap::mds_info_t& info, bool *mds_propose, bool *osd_propose);
+ void tick() override; // check state, take actions
+
+ int dump_metadata(const FSMap &fsmap, const std::string &who, Formatter *f,
+ ostream& err);
+
+ void update_metadata(mds_gid_t gid, const Metadata& metadata);
+ void remove_from_metadata(const FSMap &fsmap, MonitorDBStore::TransactionRef t);
+ int load_metadata(map<mds_gid_t, Metadata>& m);
+ void count_metadata(const std::string& field, Formatter *f);
+public:
+ void count_metadata(const std::string& field, map<string,int> *out);
+protected:
+
+ // MDS daemon GID to latest health state from that GID
+ std::map<uint64_t, MDSHealth> pending_daemon_health;
+ std::set<uint64_t> pending_daemon_health_rm;
+
+ map<mds_gid_t, Metadata> pending_metadata;
+
+ mds_gid_t gid_from_arg(const FSMap &fsmap, const std::string &arg, std::ostream& err);
+
+ // When did the mon last call into our tick() method? Used for detecting
+ // when the mon was not updating us for some period (e.g. during slow
+ // election) to reset last_beacon timeouts
+ mono_time last_tick = mono_clock::zero();
+};
+
+#endif