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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>
#include "include/types.h"
#include "PaxosFSMap.h"
#include "PaxosService.h"
#include "msg/Messenger.h"
#include "messages/MMDSBeacon.h"
#include "CommandHandler.h"
class FileSystemCommandHandler;
class MDSMonitor : public PaxosService, public PaxosFSMap, protected CommandHandler {
public:
MDSMonitor(Monitor *mn, Paxos *p, string service_name);
// service methods
void create_initial() override;
void get_store_prefixes(std::set<string>& s) const 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() const override;
bool preprocess_query(MonOpRequestRef op) override; // true if processed.
bool prepare_update(MonOpRequestRef op) override;
bool should_propose(double& delay) override;
bool should_print_status() const {
auto& fs = get_fsmap();
auto fs_count = fs.filesystem_count();
auto standby_count = fs.get_num_standby();
return fs_count > 0 || standby_count > 0;
}
void on_active() override;
void on_restart() override;
void check_subs();
void check_sub(Subscription *sub);
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(FSMap &fsmap, mds_gid_t gid);
bool is_leader() const override { return mon->is_leader(); }
protected:
// my helpers
template<int dblV = 7>
void print_map(const FSMap &m);
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);
int fail_mds(FSMap &fsmap, std::ostream &ss,
const std::string &arg,
MDSMap::mds_info_t *failed_info);
bool preprocess_command(MonOpRequestRef op);
bool prepare_command(MonOpRequestRef op);
int filesystem_command(
FSMap &fsmap,
MonOpRequestRef op,
std::string const &prefix,
const cmdmap_t& cmdmap,
std::stringstream &ss);
// beacons
struct beacon_info_t {
mono_time stamp = mono_clock::zero();
uint64_t seq = 0;
beacon_info_t() {}
beacon_info_t(mono_time stamp, uint64_t seq) : stamp(stamp), seq(seq) {}
};
map<mds_gid_t, beacon_info_t> last_beacon;
std::list<std::shared_ptr<FileSystemCommandHandler> > handlers;
bool maybe_promote_standby(FSMap& fsmap, Filesystem& fs);
bool maybe_resize_cluster(FSMap &fsmap, fs_cluster_id_t fscid);
void maybe_replace_gid(FSMap &fsmap, mds_gid_t gid,
const MDSMap::mds_info_t& info, bool *mds_propose, bool *osd_propose);
void tick() override; // check state, take actions
int dump_metadata(const FSMap &fsmap, const std::string &who, Formatter *f,
ostream& err);
void update_metadata(mds_gid_t gid, const Metadata& metadata);
void remove_from_metadata(const FSMap &fsmap, MonitorDBStore::TransactionRef t);
int load_metadata(map<mds_gid_t, Metadata>& m);
void count_metadata(const std::string& field, Formatter *f);
public:
void count_metadata(const std::string& field, map<string,int> *out);
protected:
// 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 FSMap &fsmap, 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
mono_time last_tick = mono_clock::zero();
};
#endif
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