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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
/*
* Ceph - scalable distributed file system
*
* Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
*
* This is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License version 2.1, as published by the Free Software
* Foundation. See file COPYING.
*
*/
/* Metadata Server Monitor
*/
#ifndef CEPH_MDSMONITOR_H
#define CEPH_MDSMONITOR_H
#include <map>
#include <set>
using namespace std;
#include "include/types.h"
#include "mds/FSMap.h"
#include "mds/MDSMap.h"
#include "PaxosService.h"
#include "msg/Messenger.h"
#include "messages/MMDSBeacon.h"
class MMonCommand;
class MMDSLoadTargets;
class MMDSMap;
class FileSystemCommandHandler;
#define MDS_HEALTH_PREFIX "mds_health"
class MDSMonitor : public PaxosService {
public:
MDSMonitor(Monitor *mn, Paxos *p, string service_name);
// service methods
void create_initial() override;
void update_from_paxos(bool *need_bootstrap) override;
void init() override;
void create_pending() override;
void encode_pending(MonitorDBStore::TransactionRef t) override;
// we don't require full versions; don't encode any.
void encode_full(MonitorDBStore::TransactionRef t) override { }
version_t get_trim_to() override;
bool preprocess_query(MonOpRequestRef op) override; // true if processed.
bool prepare_update(MonOpRequestRef op) override;
bool should_propose(double& delay) override;
void on_active() override;
void on_restart() override;
void check_subs();
void check_sub(Subscription *sub);
const FSMap &get_pending() const { return pending_fsmap; }
const FSMap &get_fsmap() const { return fsmap; }
void dump_info(Formatter *f);
int print_nodes(Formatter *f);
/**
* Return true if a blacklist was done (i.e. OSD propose needed)
*/
bool fail_mds_gid(mds_gid_t gid);
protected:
// mds maps
FSMap fsmap; // current
FSMap pending_fsmap; // current + pending updates
// my helpers
void print_map(FSMap &m, int dbl=7);
void update_logger();
void _updated(MonOpRequestRef op);
void _note_beacon(class MMDSBeacon *m);
bool preprocess_beacon(MonOpRequestRef op);
bool prepare_beacon(MonOpRequestRef op);
bool preprocess_offload_targets(MonOpRequestRef op);
bool prepare_offload_targets(MonOpRequestRef op);
void get_health(list<pair<health_status_t,string> >& summary,
list<pair<health_status_t,string> > *detail,
CephContext *cct) const override;
int fail_mds(std::ostream &ss, const std::string &arg);
bool preprocess_command(MonOpRequestRef op);
bool prepare_command(MonOpRequestRef op);
int parse_role(
const std::string &role_str,
mds_role_t *role,
std::ostream &ss);
void modify_legacy_filesystem(
std::function<void(std::shared_ptr<Filesystem> )> fn);
int legacy_filesystem_command(
MonOpRequestRef op,
std::string const &prefix,
map<string, cmd_vartype> &cmdmap,
std::stringstream &ss);
int filesystem_command(
MonOpRequestRef op,
std::string const &prefix,
map<string, cmd_vartype> &cmdmap,
std::stringstream &ss);
// beacons
struct beacon_info_t {
utime_t stamp;
uint64_t seq;
};
map<mds_gid_t, beacon_info_t> last_beacon;
bool try_standby_replay(
const MDSMap::mds_info_t& finfo,
const Filesystem &leader_fs,
const MDSMap::mds_info_t& ainfo);
std::list<std::shared_ptr<FileSystemCommandHandler> > handlers;
bool maybe_promote_standby(std::shared_ptr<Filesystem> fs);
bool maybe_expand_cluster(std::shared_ptr<Filesystem> fs);
void maybe_replace_gid(mds_gid_t gid, const beacon_info_t &beacon,
bool *mds_propose, bool *osd_propose);
void tick() override; // check state, take actions
int dump_metadata(const string& who, Formatter *f, ostream& err);
MDSMap *generate_mds_map(fs_cluster_id_t fscid);
void update_metadata(mds_gid_t gid, const Metadata& metadata);
void remove_from_metadata(MonitorDBStore::TransactionRef t);
int load_metadata(map<mds_gid_t, Metadata>& m);
// MDS daemon GID to latest health state from that GID
std::map<uint64_t, MDSHealth> pending_daemon_health;
std::set<uint64_t> pending_daemon_health_rm;
map<mds_gid_t, Metadata> pending_metadata;
mds_gid_t gid_from_arg(const std::string& arg, std::ostream& err);
// When did the mon last call into our tick() method? Used for detecting
// when the mon was not updating us for some period (e.g. during slow
// election) to reset last_beacon timeouts
utime_t last_tick;
};
#endif
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