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 "mds/FSMap.h"
  27 #include "mds/MDSMap.h"
  28 #include "PaxosService.h"
  29 #include "msg/Messenger.h"
  30 #include "messages/MMDSBeacon.h"
  31
  32 class MMonCommand;
  33 class MMDSLoadTargets;
  34 class MMDSMap;
  35 class FileSystemCommandHandler;
  36
  37 #define MDS_HEALTH_PREFIX "mds_health"
  38
  39 class MDSMonitor : public PaxosService {
  40  public:
  41   MDSMonitor(Monitor *mn, Paxos *p, string service_name);
  42
  43   // service methods
  44   void create_initial() override;
  45   void update_from_paxos(bool *need_bootstrap) override;
  46   void init() override;
  47   void create_pending() override;
  48   void encode_pending(MonitorDBStore::TransactionRef t) override;
  49   // we don't require full versions; don't encode any.
  50   void encode_full(MonitorDBStore::TransactionRef t) override { }
  51   version_t get_trim_to() override;
  52
  53   bool preprocess_query(MonOpRequestRef op) override;  // true if processed.
  54   bool prepare_update(MonOpRequestRef op) override;
  55   bool should_propose(double& delay) override;
  56
  57   void on_active() override;
  58   void on_restart() override;
  59
  60   void check_subs();
  61   void check_sub(Subscription *sub);
  62
  63   const FSMap &get_pending() const { return pending_fsmap; }
  64   const FSMap &get_fsmap() const { return fsmap; }
  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(mds_gid_t gid);
  72  protected:
  73   // mds maps
  74   FSMap fsmap;           // current
  75   FSMap pending_fsmap;  // current + pending updates
  76
  77   // my helpers
  78   void print_map(FSMap &m, int dbl=7);
  79   void update_logger();
  80
  81   void _updated(MonOpRequestRef op);
  82
  83   void _note_beacon(class MMDSBeacon *m);
  84   bool preprocess_beacon(MonOpRequestRef op);
  85   bool prepare_beacon(MonOpRequestRef op);
  86
  87   bool preprocess_offload_targets(MonOpRequestRef op);
  88   bool prepare_offload_targets(MonOpRequestRef op);
  89
  90   void get_health(list<pair<health_status_t,string> >& summary,
  91                   list<pair<health_status_t,string> > *detail,
  92                   CephContext *cct) const override;
  93   int fail_mds(std::ostream &ss, const std::string &arg,
  94       MDSMap::mds_info_t *failed_info);
  95
  96   bool preprocess_command(MonOpRequestRef op);
  97   bool prepare_command(MonOpRequestRef op);
  98
  99   int parse_role(
 100       const std::string &role_str,
 101       mds_role_t *role,
 102       std::ostream &ss);
 103
 104   void modify_legacy_filesystem(
 105       std::function<void(std::shared_ptr<Filesystem> )> fn);
 106   int legacy_filesystem_command(
 107       MonOpRequestRef op,
 108       std::string const &prefix,
 109       map<string, cmd_vartype> &cmdmap,
 110       std::stringstream &ss);
 111   int filesystem_command(
 112       MonOpRequestRef op,
 113       std::string const &prefix,
 114       map<string, cmd_vartype> &cmdmap,
 115       std::stringstream &ss);
 116
 117   // beacons
 118   struct beacon_info_t {
 119     utime_t stamp;
 120     uint64_t seq;
 121   };
 122   map<mds_gid_t, beacon_info_t> last_beacon;
 123
 124   bool try_standby_replay(
 125       const MDSMap::mds_info_t& finfo,
 126       const Filesystem &leader_fs,
 127       const MDSMap::mds_info_t& ainfo);
 128
 129   std::list<std::shared_ptr<FileSystemCommandHandler> > handlers;
 130
 131   bool maybe_promote_standby(std::shared_ptr<Filesystem> fs);
 132   bool maybe_expand_cluster(std::shared_ptr<Filesystem> fs);
 133   void maybe_replace_gid(mds_gid_t gid, const MDSMap::mds_info_t& info,
 134       bool *mds_propose, bool *osd_propose);
 135   void tick() override;     // check state, take actions
 136
 137   int dump_metadata(const string& who, Formatter *f, ostream& err);
 138
 139   void update_metadata(mds_gid_t gid, const Metadata& metadata);
 140   void remove_from_metadata(MonitorDBStore::TransactionRef t);
 141   int load_metadata(map<mds_gid_t, Metadata>& m);
 142   void count_metadata(const string& field, Formatter *f);
 143 public:
 144   void count_metadata(const string& field, map<string,int> *out);
 145 protected:
 146
 147   // MDS daemon GID to latest health state from that GID
 148   std::map<uint64_t, MDSHealth> pending_daemon_health;
 149   std::set<uint64_t> pending_daemon_health_rm;
 150
 151
 152   map<mds_gid_t, Metadata> pending_metadata;
 153
 154   mds_gid_t gid_from_arg(const std::string& arg, std::ostream& err);
 155
 156   // When did the mon last call into our tick() method?  Used for detecting
 157   // when the mon was not updating us for some period (e.g. during slow
 158   // election) to reset last_beacon timeouts
 159   utime_t last_tick;
 160 };
 161
 162 #endif