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 "include/Context.h"
  18 #include "MgrMap.h"
  19 #include "PaxosService.h"
  20
  21 class MgrMonitor: public PaxosService
  22 {
  23   MgrMap map;
  24   MgrMap pending_map;
  25   bool ever_had_active_mgr = false;
  26
  27   utime_t first_seen_inactive;
  28
  29   std::map<uint64_t, ceph::coarse_mono_clock::time_point> last_beacon;
  30
  31   /**
  32    * If a standby is available, make it active, given that
  33    * there is currently no active daemon.
  34    *
  35    * @return true if a standby was promoted
  36    */
  37   bool promote_standby();
  38   void drop_active();
  39   void drop_standby(uint64_t gid);
  40
  41   Context *digest_event = nullptr;
  42   void cancel_timer();
  43
  44   bool check_caps(MonOpRequestRef op, const uuid_d& fsid);
  45
  46   health_status_t should_warn_about_mgr_down();
  47
  48 public:
  49   MgrMonitor(Monitor *mn, Paxos *p, const string& service_name)
  50     : PaxosService(mn, p, service_name)
  51   {}
  52   ~MgrMonitor() override {}
  53
  54   void init() override;
  55   void on_shutdown() override;
  56
  57   const MgrMap &get_map() const { return map; }
  58
  59   bool in_use() const { return map.epoch > 0; }
  60
  61   void create_initial() override;
  62   void update_from_paxos(bool *need_bootstrap) override;
  63   void create_pending() override;
  64   void encode_pending(MonitorDBStore::TransactionRef t) override;
  65
  66   bool preprocess_query(MonOpRequestRef op) override;
  67   bool prepare_update(MonOpRequestRef op) override;
  68
  69   bool preprocess_command(MonOpRequestRef op);
  70   bool prepare_command(MonOpRequestRef op);
  71
  72   void encode_full(MonitorDBStore::TransactionRef t) override { }
  73
  74   bool preprocess_beacon(MonOpRequestRef op);
  75   bool prepare_beacon(MonOpRequestRef op);
  76
  77   void check_sub(Subscription *sub);
  78   void check_subs();
  79   void send_digests();
  80
  81   void on_active() override;
  82   void on_restart() override;
  83
  84   void get_health(list<pair<health_status_t,string> >& summary,
  85                   list<pair<health_status_t,string> > *detail,
  86                   CephContext *cct) const override;
  87   void tick() override;
  88
  89   void print_summary(Formatter *f, std::ostream *ss) const;
  90
  91   friend class C_Updated;
  92 };
  93
  94 #endif