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 using namespace std;
  24
  25 #include "include/types.h"
  26 #include "PaxosFSMap.h"
  27 #include "PaxosService.h"
  28 #include "msg/Messenger.h"
  29 #include "messages/MMDSBeacon.h"
  30
  31 class MMonCommand;
  32 class MMDSLoadTargets;
  33 class MMDSMap;
  34 class FileSystemCommandHandler;
  35
  36 class MDSMonitor : public PaxosService, public PaxosFSMap {
  37  public:
  38   MDSMonitor(Monitor *mn, Paxos *p, string service_name);
  39
  40   // service methods
  41   void create_initial() override;
  42   void get_store_prefixes(std::set<string>& s) 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() 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   void on_active() override;
  56   void on_restart() override;
  57
  58   void check_subs();
  59   void check_sub(Subscription *sub);
  60
  61   void dump_info(Formatter *f);
  62   int print_nodes(Formatter *f);
  63
  64   /**
  65    * Return true if a blacklist was done (i.e. OSD propose needed)
  66    */
  67   bool fail_mds_gid(mds_gid_t gid);
  68
  69   bool is_leader() const override { return mon->is_leader(); }
  70
  71  protected:
  72   // my helpers
  73   void print_map(const FSMap &m, int dbl=7);
  74   void update_logger();
  75
  76   void _updated(MonOpRequestRef op);
  77
  78   void _note_beacon(class MMDSBeacon *m);
  79   bool preprocess_beacon(MonOpRequestRef op);
  80   bool prepare_beacon(MonOpRequestRef op);
  81
  82   bool preprocess_offload_targets(MonOpRequestRef op);
  83   bool prepare_offload_targets(MonOpRequestRef op);
  84
  85   void get_health(list<pair<health_status_t,string> >& summary,
  86                   list<pair<health_status_t,string> > *detail,
  87                   CephContext *cct) const override;
  88   int fail_mds(std::ostream &ss, const std::string &arg,
  89       MDSMap::mds_info_t *failed_info);
  90
  91   bool preprocess_command(MonOpRequestRef op);
  92   bool prepare_command(MonOpRequestRef op);
  93
  94   int parse_role(
  95       const std::string &role_str,
  96       mds_role_t *role,
  97       std::ostream &ss);
  98
  99   void modify_legacy_filesystem(
 100       std::function<void(std::shared_ptr<Filesystem> )> fn);
 101   int legacy_filesystem_command(
 102       MonOpRequestRef op,
 103       std::string const &prefix,
 104       map<string, cmd_vartype> &cmdmap,
 105       std::stringstream &ss);
 106   int filesystem_command(
 107       MonOpRequestRef op,
 108       std::string const &prefix,
 109       map<string, cmd_vartype> &cmdmap,
 110       std::stringstream &ss);
 111
 112   // beacons
 113   struct beacon_info_t {
 114     utime_t stamp;
 115     uint64_t seq;
 116   };
 117   map<mds_gid_t, beacon_info_t> last_beacon;
 118
 119   bool try_standby_replay(
 120       const MDSMap::mds_info_t& finfo,
 121       const Filesystem &leader_fs,
 122       const MDSMap::mds_info_t& ainfo);
 123
 124   std::list<std::shared_ptr<FileSystemCommandHandler> > handlers;
 125
 126   bool maybe_promote_standby(std::shared_ptr<Filesystem> &fs);
 127   bool maybe_expand_cluster(std::shared_ptr<Filesystem> &fs);
 128   void maybe_replace_gid(mds_gid_t gid, const MDSMap::mds_info_t& info,
 129       bool *mds_propose, bool *osd_propose);
 130   void tick() override;     // check state, take actions
 131
 132   int dump_metadata(const string& who, Formatter *f, ostream& err);
 133
 134   void update_metadata(mds_gid_t gid, const Metadata& metadata);
 135   void remove_from_metadata(MonitorDBStore::TransactionRef t);
 136   int load_metadata(map<mds_gid_t, Metadata>& m);
 137   void count_metadata(const string& field, Formatter *f);
 138 public:
 139   void count_metadata(const string& field, map<string,int> *out);
 140 protected:
 141
 142   // MDS daemon GID to latest health state from that GID
 143   std::map<uint64_t, MDSHealth> pending_daemon_health;
 144   std::set<uint64_t> pending_daemon_health_rm;
 145
 146
 147   map<mds_gid_t, Metadata> pending_metadata;
 148
 149   mds_gid_t gid_from_arg(const std::string& arg, std::ostream& err);
 150
 151   // When did the mon last call into our tick() method?  Used for detecting
 152   // when the mon was not updating us for some period (e.g. during slow
 153   // election) to reset last_beacon timeouts
 154   utime_t last_tick;
 155 };
 156
 157 #endif