ceph/src/mon/MDSMonitor.h

   1 // -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
   2 // vim: ts=8 sw=2 smarttab
   3 /*
   4  * Ceph - scalable distributed file system
   5  *
   6  * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
   7  *
   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.
  12  *
  13  */
  14
  15 /* Metadata Server Monitor
  16  */
  17
  18 #ifndef CEPH_MDSMONITOR_H
  19 #define CEPH_MDSMONITOR_H
  20
  21 #include <map>
  22 #include <set>
  23
  24 #include "include/types.h"
  25 #include "PaxosFSMap.h"
  26 #include "PaxosService.h"
  27 #include "msg/Messenger.h"
  28 #include "messages/MMDSBeacon.h"
  29 #include "CommandHandler.h"
  30
  31 class FileSystemCommandHandler;
  32
  33 class MDSMonitor : public PaxosService, public PaxosFSMap, protected CommandHandler {
  34  public:
  35   using clock = ceph::coarse_mono_clock;
  36   using time = ceph::coarse_mono_time;
  37
  38   MDSMonitor(Monitor &mn, Paxos &p, std::string service_name);
  39
  40   // service methods
  41   void create_initial() override;
  42   void get_store_prefixes(std::set<std::string>& s) const override;
  43   void update_from_paxos(bool *need_bootstrap) override;
  44   void init() override;
  45   void create_pending() override;
  46   void encode_pending(MonitorDBStore::TransactionRef t) override;
  47   // we don't require full versions; don't encode any.
  48   void encode_full(MonitorDBStore::TransactionRef t) override { }
  49   version_t get_trim_to() const override;
  50
  51   bool preprocess_query(MonOpRequestRef op) override;  // true if processed.
  52   bool prepare_update(MonOpRequestRef op) override;
  53   bool should_propose(double& delay) override;
  54
  55   bool should_print_status() const {
  56     auto& fs = get_fsmap();
  57     auto fs_count = fs.filesystem_count();
  58     auto standby_count = fs.get_num_standby();
  59     return fs_count > 0 || standby_count > 0;
  60   }
  61
  62   void on_active() override;
  63   void on_restart() override;
  64
  65   void check_subs();
  66   void check_sub(Subscription *sub);
  67
  68   void dump_info(ceph::Formatter *f);
  69   int print_nodes(ceph::Formatter *f);
  70
  71   /**
  72    * Return true if a blocklist was done (i.e. OSD propose needed)
  73    */
  74   bool fail_mds_gid(FSMap &fsmap, mds_gid_t gid);
  75
  76   bool is_leader() const override { return mon.is_leader(); }
  77
  78  protected:
  79   using mds_info_t = MDSMap::mds_info_t;
  80
  81   // my helpers
  82   template<int dblV = 7>
  83   void print_map(const FSMap &m);
  84
  85   void _updated(MonOpRequestRef op);
  86
  87   void _note_beacon(class MMDSBeacon *m);
  88   bool preprocess_beacon(MonOpRequestRef op);
  89   bool prepare_beacon(MonOpRequestRef op);
  90
  91   bool preprocess_offload_targets(MonOpRequestRef op);
  92   bool prepare_offload_targets(MonOpRequestRef op);
  93
  94   int fail_mds(FSMap &fsmap, std::ostream &ss,
  95       const std::string &arg, mds_info_t *failed_info);
  96
  97   bool preprocess_command(MonOpRequestRef op);
  98   bool prepare_command(MonOpRequestRef op);
  99
 100   int filesystem_command(
 101       FSMap &fsmap,
 102       MonOpRequestRef op,
 103       std::string const &prefix,
 104       const cmdmap_t& cmdmap,
 105       std::stringstream &ss);
 106
 107   // beacons
 108   struct beacon_info_t {
 109     ceph::mono_time stamp = ceph::mono_clock::zero();
 110     uint64_t seq = 0;
 111     beacon_info_t() {}
 112     beacon_info_t(ceph::mono_time stamp, uint64_t seq) : stamp(stamp), seq(seq) {}
 113   };
 114   std::map<mds_gid_t, beacon_info_t> last_beacon;
 115
 116   std::list<std::shared_ptr<FileSystemCommandHandler> > handlers;
 117
 118   bool maybe_promote_standby(FSMap& fsmap, Filesystem& fs);
 119   bool maybe_resize_cluster(FSMap &fsmap, fs_cluster_id_t fscid);
 120   bool drop_mds(FSMap &fsmap, mds_gid_t gid, const mds_info_t* rep_info, bool* osd_propose);
 121   bool check_health(FSMap &fsmap, bool* osd_propose);
 122   void tick() override;     // check state, take actions
 123
 124   int dump_metadata(const FSMap &fsmap, const std::string &who, ceph::Formatter *f,
 125                     std::ostream& err);
 126
 127   void update_metadata(mds_gid_t gid, const Metadata& metadata);
 128   void remove_from_metadata(const FSMap &fsmap, MonitorDBStore::TransactionRef t);
 129   int load_metadata(std::map<mds_gid_t, Metadata>& m);
 130   void count_metadata(const std::string& field, ceph::Formatter *f);
 131
 132 public:
 133   void print_fs_summary(std::ostream& out) {
 134     get_fsmap().print_fs_summary(out);
 135   }
 136   void count_metadata(const std::string& field, std::map<std::string,int> *out);
 137   void get_versions(std::map<std::string, std::list<std::string>> &versions);
 138
 139 protected:
 140   // MDS daemon GID to latest health state from that GID
 141   std::map<uint64_t, MDSHealth> pending_daemon_health;
 142   std::set<uint64_t> pending_daemon_health_rm;
 143
 144   std::map<mds_gid_t, Metadata> pending_metadata;
 145
 146   mds_gid_t gid_from_arg(const FSMap &fsmap, const std::string &arg, std::ostream& err);
 147
 148   // When did the mon last call into our tick() method?  Used for detecting
 149   // when the mon was not updating us for some period (e.g. during slow
 150   // election) to reset last_beacon timeouts
 151   ceph::mono_time last_tick = ceph::mono_clock::zero();
 152
 153 private:
 154   time last_fsmap_struct_flush = clock::zero();
 155   bool check_fsmap_struct_version = true;
 156 };
 157
 158 #endif