1 // -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
2 // vim: ts=8 sw=2 smarttab
4 * Ceph - scalable distributed file system
6 * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
8 * This is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License version 2.1, as published by the Free Software
11 * Foundation. See file COPYING.
15 /* Metadata Server Monitor
18 #ifndef CEPH_MDSMONITOR_H
19 #define CEPH_MDSMONITOR_H
25 #include "include/types.h"
26 #include "mds/FSMap.h"
27 #include "mds/MDSMap.h"
28 #include "PaxosService.h"
29 #include "msg/Messenger.h"
30 #include "messages/MMDSBeacon.h"
33 class MMDSLoadTargets;
35 class FileSystemCommandHandler;
37 class MDSMonitor : public PaxosService {
39 MDSMonitor(Monitor *mn, Paxos *p, string service_name);
42 void create_initial() override;
43 void get_store_prefixes(std::set<string>& s) override;
44 void update_from_paxos(bool *need_bootstrap) override;
46 void create_pending() override;
47 void encode_pending(MonitorDBStore::TransactionRef t) override;
48 // we don't require full versions; don't encode any.
49 void encode_full(MonitorDBStore::TransactionRef t) override { }
50 version_t get_trim_to() override;
52 bool preprocess_query(MonOpRequestRef op) override; // true if processed.
53 bool prepare_update(MonOpRequestRef op) override;
54 bool should_propose(double& delay) override;
56 void on_active() override;
57 void on_restart() override;
60 void check_sub(Subscription *sub);
62 const FSMap &get_pending() const { return pending_fsmap; }
63 const FSMap &get_fsmap() const { return fsmap; }
64 void dump_info(Formatter *f);
65 int print_nodes(Formatter *f);
68 * Return true if a blacklist was done (i.e. OSD propose needed)
70 bool fail_mds_gid(mds_gid_t gid);
73 FSMap fsmap; // current
74 FSMap pending_fsmap; // current + pending updates
77 void print_map(FSMap &m, int dbl=7);
80 void _updated(MonOpRequestRef op);
82 void _note_beacon(class MMDSBeacon *m);
83 bool preprocess_beacon(MonOpRequestRef op);
84 bool prepare_beacon(MonOpRequestRef op);
86 bool preprocess_offload_targets(MonOpRequestRef op);
87 bool prepare_offload_targets(MonOpRequestRef op);
89 void get_health(list<pair<health_status_t,string> >& summary,
90 list<pair<health_status_t,string> > *detail,
91 CephContext *cct) const override;
92 int fail_mds(std::ostream &ss, const std::string &arg,
93 MDSMap::mds_info_t *failed_info);
95 bool preprocess_command(MonOpRequestRef op);
96 bool prepare_command(MonOpRequestRef op);
99 const std::string &role_str,
103 void modify_legacy_filesystem(
104 std::function<void(std::shared_ptr<Filesystem> )> fn);
105 int legacy_filesystem_command(
107 std::string const &prefix,
108 map<string, cmd_vartype> &cmdmap,
109 std::stringstream &ss);
110 int filesystem_command(
112 std::string const &prefix,
113 map<string, cmd_vartype> &cmdmap,
114 std::stringstream &ss);
117 struct beacon_info_t {
121 map<mds_gid_t, beacon_info_t> last_beacon;
123 bool try_standby_replay(
124 const MDSMap::mds_info_t& finfo,
125 const Filesystem &leader_fs,
126 const MDSMap::mds_info_t& ainfo);
128 std::list<std::shared_ptr<FileSystemCommandHandler> > handlers;
130 bool maybe_promote_standby(std::shared_ptr<Filesystem> fs);
131 bool maybe_expand_cluster(std::shared_ptr<Filesystem> fs);
132 void maybe_replace_gid(mds_gid_t gid, const MDSMap::mds_info_t& info,
133 bool *mds_propose, bool *osd_propose);
134 void tick() override; // check state, take actions
136 int dump_metadata(const string& who, Formatter *f, ostream& err);
138 void update_metadata(mds_gid_t gid, const Metadata& metadata);
139 void remove_from_metadata(MonitorDBStore::TransactionRef t);
140 int load_metadata(map<mds_gid_t, Metadata>& m);
141 void count_metadata(const string& field, Formatter *f);
143 void count_metadata(const string& field, map<string,int> *out);
146 // MDS daemon GID to latest health state from that GID
147 std::map<uint64_t, MDSHealth> pending_daemon_health;
148 std::set<uint64_t> pending_daemon_health_rm;
151 map<mds_gid_t, Metadata> pending_metadata;
153 mds_gid_t gid_from_arg(const std::string& arg, std::ostream& err);
155 // When did the mon last call into our tick() method? Used for detecting
156 // when the mon was not updating us for some period (e.g. during slow
157 // election) to reset last_beacon timeouts