ceph/src/mon/MgrMonitor.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) 2016 John Spray <john.spray@redhat.com>
   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 #ifndef CEPH_MGRMONITOR_H
  15 #define CEPH_MGRMONITOR_H
  16
  17 #include <map>
  18 #include <set>
  19
  20 #include "include/Context.h"
  21 #include "MgrMap.h"
  22 #include "PaxosService.h"
  23 #include "MonCommand.h"
  24
  25 class MgrMonitor: public PaxosService
  26 {
  27   MgrMap map;
  28   MgrMap pending_map;
  29   bool ever_had_active_mgr = false;
  30
  31   std::map<std::string, bufferlist> pending_metadata;
  32   std::set<std::string>             pending_metadata_rm;
  33
  34   utime_t first_seen_inactive;
  35
  36   std::map<uint64_t, ceph::coarse_mono_clock::time_point> last_beacon;
  37
  38   /**
  39    * If a standby is available, make it active, given that
  40    * there is currently no active daemon.
  41    *
  42    * @return true if a standby was promoted
  43    */
  44   bool promote_standby();
  45   void drop_active();
  46   void drop_standby(uint64_t gid);
  47
  48   Context *digest_event = nullptr;
  49   void cancel_timer();
  50
  51   bool check_caps(MonOpRequestRef op, const uuid_d& fsid);
  52
  53   health_status_t should_warn_about_mgr_down();
  54
  55   // Command descriptions we've learned from the active mgr
  56   std::vector<MonCommand> command_descs;
  57   std::vector<MonCommand> pending_command_descs;
  58
  59 public:
  60   MgrMonitor(Monitor *mn, Paxos *p, const string& service_name)
  61     : PaxosService(mn, p, service_name)
  62   {}
  63   ~MgrMonitor() override {}
  64
  65   void init() override;
  66   void on_shutdown() override;
  67
  68   const MgrMap &get_map() const { return map; }
  69
  70   bool in_use() const { return map.epoch > 0; }
  71
  72   void create_initial() override;
  73   void update_from_paxos(bool *need_bootstrap) override;
  74   void create_pending() override;
  75   void encode_pending(MonitorDBStore::TransactionRef t) override;
  76
  77   bool preprocess_query(MonOpRequestRef op) override;
  78   bool prepare_update(MonOpRequestRef op) override;
  79
  80   bool preprocess_command(MonOpRequestRef op);
  81   bool prepare_command(MonOpRequestRef op);
  82
  83   void encode_full(MonitorDBStore::TransactionRef t) override { }
  84
  85   bool preprocess_beacon(MonOpRequestRef op);
  86   bool prepare_beacon(MonOpRequestRef op);
  87
  88   void check_sub(Subscription *sub);
  89   void check_subs();
  90   void send_digests();
  91
  92   void on_active() override;
  93   void on_restart() override;
  94
  95   void get_health(list<pair<health_status_t,string> >& summary,
  96                   list<pair<health_status_t,string> > *detail,
  97                   CephContext *cct) const override;
  98   void tick() override;
  99
 100   void print_summary(Formatter *f, std::ostream *ss) const;
 101
 102   const std::vector<MonCommand> &get_command_descs() const {
 103     return command_descs;
 104   }
 105
 106   int load_metadata(const string& name, std::map<string, string>& m,
 107                     ostream *err);
 108   int dump_metadata(const string& name, Formatter *f, ostream *err);
 109   void count_metadata(const string& field, Formatter *f);
 110   void count_metadata(const string& field, std::map<string,int> *out);
 111
 112   friend class C_Updated;
 113 };
 114
 115 #endif