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(FSMap &fsmap, 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(FSMap &fsmap, std::ostream &ss,
  89       const std::string &arg,
  90       MDSMap::mds_info_t *failed_info);
  91
  92   bool preprocess_command(MonOpRequestRef op);
  93   bool prepare_command(MonOpRequestRef op);
  94
  95   void modify_legacy_filesystem(
  96       FSMap &fsmap,
  97       std::function<void(std::shared_ptr<Filesystem> )> fn);
  98   int legacy_filesystem_command(
  99       FSMap &fsmap,
 100       MonOpRequestRef op,
 101       std::string const &prefix,
 102       map<string, cmd_vartype> &cmdmap,
 103       std::stringstream &ss);
 104   int filesystem_command(
 105       FSMap &fsmap,
 106       MonOpRequestRef op,
 107       std::string const &prefix,
 108       map<string, cmd_vartype> &cmdmap,
 109       std::stringstream &ss);
 110
 111   // beacons
 112   struct beacon_info_t {
 113     mono_time stamp = mono_clock::zero();
 114     uint64_t seq = 0;
 115     beacon_info_t() {}
 116     beacon_info_t(mono_time stamp, uint64_t seq) : stamp(stamp), seq(seq) {}
 117   };
 118   map<mds_gid_t, beacon_info_t> last_beacon;
 119
 120   bool try_standby_replay(FSMap &fsmap, const MDSMap::mds_info_t& finfo,
 121       const Filesystem &leader_fs, const MDSMap::mds_info_t& ainfo);
 122
 123   std::list<std::shared_ptr<FileSystemCommandHandler> > handlers;
 124
 125   bool maybe_promote_standby(FSMap &fsmap, std::shared_ptr<Filesystem> &fs);
 126   bool maybe_expand_cluster(FSMap &fsmap, fs_cluster_id_t fscid);
 127   void maybe_replace_gid(FSMap &fsmap, mds_gid_t gid,
 128       const MDSMap::mds_info_t& info, bool *mds_propose, bool *osd_propose);
 129   void tick() override;     // check state, take actions
 130
 131   int dump_metadata(const FSMap &fsmap, const std::string &who, Formatter *f,
 132       ostream& err);
 133
 134   void update_metadata(mds_gid_t gid, const Metadata& metadata);
 135   void remove_from_metadata(const FSMap &fsmap, MonitorDBStore::TransactionRef t);
 136   int load_metadata(map<mds_gid_t, Metadata>& m);
 137   void count_metadata(const std::string& field, Formatter *f);
 138 public:
 139   void count_metadata(const std::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   map<mds_gid_t, Metadata> pending_metadata;
 147
 148   mds_gid_t gid_from_arg(const FSMap &fsmap, const std::string &arg, std::ostream& err);
 149
 150   // When did the mon last call into our tick() method?  Used for detecting
 151   // when the mon was not updating us for some period (e.g. during slow
 152   // election) to reset last_beacon timeouts
 153   mono_time last_tick = mono_clock::zero();
 154 };
 155
 156 #endif