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   MDSMonitor(Monitor *mn, Paxos *p, string service_name);
  36
  37   // service methods
  38   void create_initial() override;
  39   void get_store_prefixes(std::set<string>& s) const override;
  40   void update_from_paxos(bool *need_bootstrap) override;
  41   void init() override;
  42   void create_pending() override;
  43   void encode_pending(MonitorDBStore::TransactionRef t) override;
  44   // we don't require full versions; don't encode any.
  45   void encode_full(MonitorDBStore::TransactionRef t) override { }
  46   version_t get_trim_to() const override;
  47
  48   bool preprocess_query(MonOpRequestRef op) override;  // true if processed.
  49   bool prepare_update(MonOpRequestRef op) override;
  50   bool should_propose(double& delay) override;
  51
  52   bool should_print_status() const {
  53     auto& fs = get_fsmap();
  54     auto fs_count = fs.filesystem_count();
  55     auto standby_count = fs.get_num_standby();
  56     return fs_count > 0 || standby_count > 0;
  57   }
  58
  59   void on_active() override;
  60   void on_restart() override;
  61
  62   void check_subs();
  63   void check_sub(Subscription *sub);
  64
  65   void dump_info(Formatter *f);
  66   int print_nodes(Formatter *f);
  67
  68   /**
  69    * Return true if a blacklist was done (i.e. OSD propose needed)
  70    */
  71   bool fail_mds_gid(FSMap &fsmap, mds_gid_t gid);
  72
  73   bool is_leader() const override { return mon->is_leader(); }
  74
  75  protected:
  76   using mds_info_t = MDSMap::mds_info_t;
  77
  78   // my helpers
  79   template<int dblV = 7>
  80   void print_map(const FSMap &m);
  81
  82   void _updated(MonOpRequestRef op);
  83
  84   void _note_beacon(class MMDSBeacon *m);
  85   bool preprocess_beacon(MonOpRequestRef op);
  86   bool prepare_beacon(MonOpRequestRef op);
  87
  88   bool preprocess_offload_targets(MonOpRequestRef op);
  89   bool prepare_offload_targets(MonOpRequestRef op);
  90
  91   int fail_mds(FSMap &fsmap, std::ostream &ss,
  92       const std::string &arg,
  93       mds_info_t *failed_info);
  94
  95   bool preprocess_command(MonOpRequestRef op);
  96   bool prepare_command(MonOpRequestRef op);
  97
  98   int filesystem_command(
  99       FSMap &fsmap,
 100       MonOpRequestRef op,
 101       std::string const &prefix,
 102       const cmdmap_t& cmdmap,
 103       std::stringstream &ss);
 104
 105   // beacons
 106   struct beacon_info_t {
 107     mono_time stamp = mono_clock::zero();
 108     uint64_t seq = 0;
 109     beacon_info_t() {}
 110     beacon_info_t(mono_time stamp, uint64_t seq) : stamp(stamp), seq(seq) {}
 111   };
 112   map<mds_gid_t, beacon_info_t> last_beacon;
 113
 114   std::list<std::shared_ptr<FileSystemCommandHandler> > handlers;
 115
 116   bool maybe_promote_standby(FSMap& fsmap, Filesystem& fs);
 117   bool maybe_resize_cluster(FSMap &fsmap, fs_cluster_id_t fscid);
 118   bool drop_mds(FSMap &fsmap, mds_gid_t gid, const mds_info_t* rep_info, bool* osd_propose);
 119   bool check_health(FSMap &fsmap, bool* osd_propose);
 120   void tick() override;     // check state, take actions
 121
 122   int dump_metadata(const FSMap &fsmap, const std::string &who, Formatter *f,
 123       ostream& err);
 124
 125   void update_metadata(mds_gid_t gid, const Metadata& metadata);
 126   void remove_from_metadata(const FSMap &fsmap, MonitorDBStore::TransactionRef t);
 127   int load_metadata(map<mds_gid_t, Metadata>& m);
 128   void count_metadata(const std::string& field, Formatter *f);
 129 public:
 130   void count_metadata(const std::string& field, map<string,int> *out);
 131 protected:
 132
 133   // MDS daemon GID to latest health state from that GID
 134   std::map<uint64_t, MDSHealth> pending_daemon_health;
 135   std::set<uint64_t> pending_daemon_health_rm;
 136
 137   map<mds_gid_t, Metadata> pending_metadata;
 138
 139   mds_gid_t gid_from_arg(const FSMap &fsmap, const std::string &arg, std::ostream& err);
 140
 141   // When did the mon last call into our tick() method?  Used for detecting
 142   // when the mon was not updating us for some period (e.g. during slow
 143   // election) to reset last_beacon timeouts
 144   mono_time last_tick = mono_clock::zero();
 145 };
 146
 147 #endif