[ceph.git] / ceph / src / messages / MMDSBeacon.h

// -*- 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.
 * 
 */

#ifndef CEPH_MMDSBEACON_H
#define CEPH_MMDSBEACON_H

#include <string_view>

#include "msg/Message.h"
#include "messages/PaxosServiceMessage.h"

#include "include/types.h"

#include "mds/MDSMap.h"


/**
 * Unique ID for each type of metric we can send to the mon, so that if the mon
 * knows about the IDs then it can implement special behaviour for certain
 * messages.
 */
enum mds_metric_t {
  MDS_HEALTH_NULL = 0,
  MDS_HEALTH_TRIM,
  MDS_HEALTH_CLIENT_RECALL,
  MDS_HEALTH_CLIENT_LATE_RELEASE,
  MDS_HEALTH_CLIENT_RECALL_MANY,
  MDS_HEALTH_CLIENT_LATE_RELEASE_MANY,
  MDS_HEALTH_CLIENT_OLDEST_TID,
  MDS_HEALTH_CLIENT_OLDEST_TID_MANY,
  MDS_HEALTH_DAMAGE,
  MDS_HEALTH_READ_ONLY,
  MDS_HEALTH_SLOW_REQUEST,
  MDS_HEALTH_CACHE_OVERSIZED,
  MDS_HEALTH_SLOW_METADATA_IO,
};

inline const char *mds_metric_name(mds_metric_t m)
{
  switch (m) {
  case MDS_HEALTH_TRIM: return "MDS_TRIM";
  case MDS_HEALTH_CLIENT_RECALL: return "MDS_CLIENT_RECALL";
  case MDS_HEALTH_CLIENT_LATE_RELEASE: return "MDS_CLIENT_LATE_RELEASE";
  case MDS_HEALTH_CLIENT_RECALL_MANY: return "MDS_CLIENT_RECALL_MANY";
  case MDS_HEALTH_CLIENT_LATE_RELEASE_MANY: return "MDS_CLIENT_LATE_RELEASE_MANY";
  case MDS_HEALTH_CLIENT_OLDEST_TID: return "MDS_CLIENT_OLDEST_TID";
  case MDS_HEALTH_CLIENT_OLDEST_TID_MANY: return "MDS_CLIENT_OLDEST_TID_MANY";
  case MDS_HEALTH_DAMAGE: return "MDS_DAMAGE";
  case MDS_HEALTH_READ_ONLY: return "MDS_READ_ONLY";
  case MDS_HEALTH_SLOW_REQUEST: return "MDS_SLOW_REQUEST";
  case MDS_HEALTH_CACHE_OVERSIZED: return "MDS_CACHE_OVERSIZED";
  case MDS_HEALTH_SLOW_METADATA_IO: return "MDS_SLOW_METADATA_IO";
  default:
    return "???";
  }
}

inline const char *mds_metric_summary(mds_metric_t m)
{
  switch (m) {
  case MDS_HEALTH_TRIM:
    return "%num% MDSs behind on trimming";
  case MDS_HEALTH_CLIENT_RECALL:
    return "%num% clients failing to respond to cache pressure";
  case MDS_HEALTH_CLIENT_LATE_RELEASE:
    return "%num% clients failing to respond to capability release";
  case MDS_HEALTH_CLIENT_RECALL_MANY:
    return "%num% MDSs have many clients failing to respond to cache pressure";
  case MDS_HEALTH_CLIENT_LATE_RELEASE_MANY:
    return "%num% MDSs have many clients failing to respond to capability "
      "release";
  case MDS_HEALTH_CLIENT_OLDEST_TID:
    return "%num% clients failing to advance oldest client/flush tid";
  case MDS_HEALTH_CLIENT_OLDEST_TID_MANY:
    return "%num% MDSs have clients failing to advance oldest client/flush tid";
  case MDS_HEALTH_DAMAGE:
    return "%num% MDSs report damaged metadata";
  case MDS_HEALTH_READ_ONLY:
    return "%num% MDSs are read only";
  case MDS_HEALTH_SLOW_REQUEST:
    return "%num% MDSs report slow requests";
  case MDS_HEALTH_CACHE_OVERSIZED:
    return "%num% MDSs report oversized cache";
  case MDS_HEALTH_SLOW_METADATA_IO:
    return "%num% MDSs report slow metadata IOs";
  default:
    return "???";
  }
}

/**
 * This structure is designed to allow some flexibility in how we emit health
 * complaints, such that:
 * - The mon doesn't have to have foreknowledge of all possible metrics: we can
 *   implement new messages in the MDS and have the mon pass them through to the user
 *   (enables us to do complex checks inside the MDS, and allows mon to be older version
 *   than MDS)
 * - The mon has enough information to perform reductions on some types of metric, for
 *   example complaints about the same client from multiple MDSs where we might want
 *   to reduce three "client X is stale on MDS y" metrics into one "client X is stale
 *   on 3 MDSs" message.
 */
struct MDSHealthMetric
{
  mds_metric_t type;
  health_status_t sev;
  std::string message;
  std::map<std::string, std::string> metadata;

  void encode(bufferlist& bl) const {
    ENCODE_START(1, 1, bl);
    ceph_assert(type != MDS_HEALTH_NULL);
    encode((uint16_t)type, bl);
    encode((uint8_t)sev, bl);
    encode(message, bl);
    encode(metadata, bl);
    ENCODE_FINISH(bl);
  }

  void decode(bufferlist::const_iterator& bl) {
    DECODE_START(1, bl);
    uint16_t raw_type;
    decode(raw_type, bl);
    type = (mds_metric_t)raw_type;
    ceph_assert(type != MDS_HEALTH_NULL);
    uint8_t raw_sev;
    decode(raw_sev, bl);
    sev = (health_status_t)raw_sev;
    decode(message, bl);
    decode(metadata, bl);
    DECODE_FINISH(bl);
  }

  bool operator==(MDSHealthMetric const &other) const
  {
    return (type == other.type && sev == other.sev && message == other.message);
  }

  MDSHealthMetric() : type(MDS_HEALTH_NULL), sev(HEALTH_OK) {}
  MDSHealthMetric(mds_metric_t type_, health_status_t sev_, std::string_view message_)
    : type(type_), sev(sev_), message(message_) {}
};
WRITE_CLASS_ENCODER(MDSHealthMetric)


/**
 * Health metrics send by the MDS to the mon, so that the mon can generate
 * user friendly warnings about undesirable states.
 */
struct MDSHealth
{
  std::vector<MDSHealthMetric> metrics;

  void encode(bufferlist& bl) const {
    ENCODE_START(1, 1, bl);
    encode(metrics, bl);
    ENCODE_FINISH(bl);
  }

  void decode(bufferlist::const_iterator& bl) {
    DECODE_START(1, bl);
    decode(metrics, bl);
    DECODE_FINISH(bl);
  }

  bool operator==(MDSHealth const &other) const
  {
    return metrics == other.metrics;
  }
};
WRITE_CLASS_ENCODER(MDSHealth)


class MMDSBeacon : public PaxosServiceMessage {
private:

  static constexpr int HEAD_VERSION = 8;
  static constexpr int COMPAT_VERSION = 6;

  uuid_d fsid;
  mds_gid_t global_id = MDS_GID_NONE;
  string name;

  MDSMap::DaemonState state = MDSMap::STATE_NULL;
  version_t seq = 0;

  CompatSet compat;

  MDSHealth health;

  map<string, string> sys_info;

  uint64_t mds_features = 0;

  string fs;

protected:
  MMDSBeacon() : PaxosServiceMessage(MSG_MDS_BEACON, 0, HEAD_VERSION, COMPAT_VERSION)
  {
    set_priority(CEPH_MSG_PRIO_HIGH);
  }
  MMDSBeacon(const uuid_d &f, mds_gid_t g, const string& n, epoch_t les, MDSMap::DaemonState st, version_t se, uint64_t feat) :
    PaxosServiceMessage(MSG_MDS_BEACON, les, HEAD_VERSION, COMPAT_VERSION),
    fsid(f), global_id(g), name(n), state(st), seq(se),
    mds_features(feat) {
    set_priority(CEPH_MSG_PRIO_HIGH);
  }
  ~MMDSBeacon() override {}

public:
  const uuid_d& get_fsid() const { return fsid; }
  mds_gid_t get_global_id() const { return global_id; }
  const string& get_name() const { return name; }
  epoch_t get_last_epoch_seen() const { return version; }
  MDSMap::DaemonState get_state() const { return state; }
  version_t get_seq() const { return seq; }
  std::string_view get_type_name() const override { return "mdsbeacon"; }
  uint64_t get_mds_features() const { return mds_features; }

  CompatSet const& get_compat() const { return compat; }
  void set_compat(const CompatSet& c) { compat = c; }

  MDSHealth const& get_health() const { return health; }
  void set_health(const MDSHealth &h) { health = h; }

  const string& get_fs() const { return fs; }
  void set_fs(std::string_view s) { fs = s; }

  const map<string, string>& get_sys_info() const { return sys_info; }
  void set_sys_info(const map<string, string>& i) { sys_info = i; }

  void print(ostream& out) const override {
    out << "mdsbeacon(" << global_id << "/" << name
	<< " " << ceph_mds_state_name(state);
    if (fs.size()) {
      out << " fs=" << fs;
    }
    out << " seq=" << seq << " v" << version << ")";
  }

  void encode_payload(uint64_t features) override {
    using ceph::encode;
    paxos_encode();
    encode(fsid, payload);
    encode(global_id, payload);
    encode((__u32)state, payload);
    encode(seq, payload);
    encode(name, payload);
    encode(MDS_RANK_NONE, payload);
    encode(std::string(), payload);
    encode(compat, payload);
    encode(health, payload);
    if (state == MDSMap::STATE_BOOT) {
      encode(sys_info, payload);
    }
    encode(mds_features, payload);
    encode(FS_CLUSTER_ID_NONE, payload);
    encode(false, payload);
    encode(fs, payload);
  }
  void decode_payload() override {
    using ceph::decode;
    auto p = payload.cbegin();
    paxos_decode(p);
    decode(fsid, p);
    decode(global_id, p);
    __u32 raw_state;
    decode(raw_state, p);
    state = (MDSMap::DaemonState)raw_state;
    decode(seq, p);
    decode(name, p);
    {
      mds_rank_t standby_for_rank;
      decode(standby_for_rank, p);
    }
    {
      std::string standby_for_name;
      decode(standby_for_name, p);
    }
    decode(compat, p);
    decode(health, p);
    if (state == MDSMap::STATE_BOOT) {
      decode(sys_info, p);
    }
    decode(mds_features, p);
    {
      fs_cluster_id_t standby_for_fscid;
      decode(standby_for_fscid, p);
    }
    if (header.version >= 7) {
      bool standby_replay;
      decode(standby_replay, p);
    }

    if (header.version < 7  && state == MDSMap::STATE_STANDBY_REPLAY) {
      // Old MDS daemons request the state, instead of explicitly
      // advertising that they are configured as a replay daemon.
      state = MDSMap::STATE_STANDBY;
    }
    if (header.version >= 8) {
      decode(fs, p);
    }
  }
private:
  template<class T, typename... Args>
  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
};

#endif
Commit	Line	Data
7c673cae FG	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	#ifndef CEPH_MMDSBEACON_H
	16	#define CEPH_MMDSBEACON_H
	17
11fdf7f2	18	#include <string_view>
94b18763	19
11fdf7f2	20	#include "msg/Message.h"
7c673cae FG	21	#include "messages/PaxosServiceMessage.h"
	22
	23	#include "include/types.h"
	24
	25	#include "mds/MDSMap.h"
	26
	27
	28
	29	/**
	30	* Unique ID for each type of metric we can send to the mon, so that if the mon
	31	* knows about the IDs then it can implement special behaviour for certain
	32	* messages.
	33	*/
	34	enum mds_metric_t {
	35	MDS_HEALTH_NULL = 0,
	36	MDS_HEALTH_TRIM,
	37	MDS_HEALTH_CLIENT_RECALL,
	38	MDS_HEALTH_CLIENT_LATE_RELEASE,
	39	MDS_HEALTH_CLIENT_RECALL_MANY,
	40	MDS_HEALTH_CLIENT_LATE_RELEASE_MANY,
	41	MDS_HEALTH_CLIENT_OLDEST_TID,
	42	MDS_HEALTH_CLIENT_OLDEST_TID_MANY,
	43	MDS_HEALTH_DAMAGE,
	44	MDS_HEALTH_READ_ONLY,
	45	MDS_HEALTH_SLOW_REQUEST,
91327a77 AA	46	MDS_HEALTH_CACHE_OVERSIZED,
91327a77 AA	47	MDS_HEALTH_SLOW_METADATA_IO,
7c673cae FG	48	};
7c673cae FG	49
11fdf7f2	50	inline const char *mds_metric_name(mds_metric_t m)
224ce89b WB	51	{
	52	switch (m) {
	53	case MDS_HEALTH_TRIM: return "MDS_TRIM";
	54	case MDS_HEALTH_CLIENT_RECALL: return "MDS_CLIENT_RECALL";
	55	case MDS_HEALTH_CLIENT_LATE_RELEASE: return "MDS_CLIENT_LATE_RELEASE";
	56	case MDS_HEALTH_CLIENT_RECALL_MANY: return "MDS_CLIENT_RECALL_MANY";
	57	case MDS_HEALTH_CLIENT_LATE_RELEASE_MANY: return "MDS_CLIENT_LATE_RELEASE_MANY";
	58	case MDS_HEALTH_CLIENT_OLDEST_TID: return "MDS_CLIENT_OLDEST_TID";
	59	case MDS_HEALTH_CLIENT_OLDEST_TID_MANY: return "MDS_CLIENT_OLDEST_TID_MANY";
	60	case MDS_HEALTH_DAMAGE: return "MDS_DAMAGE";
	61	case MDS_HEALTH_READ_ONLY: return "MDS_READ_ONLY";
	62	case MDS_HEALTH_SLOW_REQUEST: return "MDS_SLOW_REQUEST";
	63	case MDS_HEALTH_CACHE_OVERSIZED: return "MDS_CACHE_OVERSIZED";
91327a77	64	case MDS_HEALTH_SLOW_METADATA_IO: return "MDS_SLOW_METADATA_IO";
224ce89b WB	65	default:
	66	return "???";
	67	}
	68	}
	69
11fdf7f2	70	inline const char *mds_metric_summary(mds_metric_t m)
224ce89b WB	71	{
	72	switch (m) {
	73	case MDS_HEALTH_TRIM:
	74	return "%num% MDSs behind on trimming";
	75	case MDS_HEALTH_CLIENT_RECALL:
	76	return "%num% clients failing to respond to cache pressure";
	77	case MDS_HEALTH_CLIENT_LATE_RELEASE:
	78	return "%num% clients failing to respond to capability release";
	79	case MDS_HEALTH_CLIENT_RECALL_MANY:
	80	return "%num% MDSs have many clients failing to respond to cache pressure";
	81	case MDS_HEALTH_CLIENT_LATE_RELEASE_MANY:
	82	return "%num% MDSs have many clients failing to respond to capability "
	83	"release";
	84	case MDS_HEALTH_CLIENT_OLDEST_TID:
	85	return "%num% clients failing to advance oldest client/flush tid";
	86	case MDS_HEALTH_CLIENT_OLDEST_TID_MANY:
	87	return "%num% MDSs have clients failing to advance oldest client/flush tid";
	88	case MDS_HEALTH_DAMAGE:
	89	return "%num% MDSs report damaged metadata";
	90	case MDS_HEALTH_READ_ONLY:
	91	return "%num% MDSs are read only";
	92	case MDS_HEALTH_SLOW_REQUEST:
	93	return "%num% MDSs report slow requests";
	94	case MDS_HEALTH_CACHE_OVERSIZED:
	95	return "%num% MDSs report oversized cache";
91327a77 AA	96	case MDS_HEALTH_SLOW_METADATA_IO:
91327a77 AA	97	return "%num% MDSs report slow metadata IOs";
224ce89b WB	98	default:
	99	return "???";
	100	}
	101	}
	102
7c673cae FG	103	/**
	104	* This structure is designed to allow some flexibility in how we emit health
	105	* complaints, such that:
	106	* - The mon doesn't have to have foreknowledge of all possible metrics: we can
	107	* implement new messages in the MDS and have the mon pass them through to the user
	108	* (enables us to do complex checks inside the MDS, and allows mon to be older version
	109	* than MDS)
	110	* - The mon has enough information to perform reductions on some types of metric, for
	111	* example complaints about the same client from multiple MDSs where we might want
	112	* to reduce three "client X is stale on MDS y" metrics into one "client X is stale
	113	* on 3 MDSs" message.
	114	*/
	115	struct MDSHealthMetric
	116	{
	117	mds_metric_t type;
	118	health_status_t sev;
	119	std::string message;
	120	std::map<std::string, std::string> metadata;
	121
	122	void encode(bufferlist& bl) const {
	123	ENCODE_START(1, 1, bl);
11fdf7f2 TL	124	ceph_assert(type != MDS_HEALTH_NULL);
	125	encode((uint16_t)type, bl);
	126	encode((uint8_t)sev, bl);
	127	encode(message, bl);
	128	encode(metadata, bl);
7c673cae FG	129	ENCODE_FINISH(bl);
	130	}
	131
11fdf7f2	132	void decode(bufferlist::const_iterator& bl) {
7c673cae	133	DECODE_START(1, bl);
f91f0fd5 TL	134	uint16_t raw_type;
	135	decode(raw_type, bl);
	136	type = (mds_metric_t)raw_type;
11fdf7f2	137	ceph_assert(type != MDS_HEALTH_NULL);
f91f0fd5 TL	138	uint8_t raw_sev;
	139	decode(raw_sev, bl);
	140	sev = (health_status_t)raw_sev;
11fdf7f2 TL	141	decode(message, bl);
11fdf7f2 TL	142	decode(metadata, bl);
7c673cae FG	143	DECODE_FINISH(bl);
	144	}
	145
	146	bool operator==(MDSHealthMetric const &other) const
	147	{
	148	return (type == other.type && sev == other.sev && message == other.message);
	149	}
	150
	151	MDSHealthMetric() : type(MDS_HEALTH_NULL), sev(HEALTH_OK) {}
11fdf7f2	152	MDSHealthMetric(mds_metric_t type_, health_status_t sev_, std::string_view message_)
7c673cae FG	153	: type(type_), sev(sev_), message(message_) {}
	154	};
	155	WRITE_CLASS_ENCODER(MDSHealthMetric)
	156
	157
	158	/**
	159	* Health metrics send by the MDS to the mon, so that the mon can generate
	160	* user friendly warnings about undesirable states.
	161	*/
	162	struct MDSHealth
	163	{
9f95a23c	164	std::vector<MDSHealthMetric> metrics;
7c673cae FG	165
	166	void encode(bufferlist& bl) const {
	167	ENCODE_START(1, 1, bl);
11fdf7f2	168	encode(metrics, bl);
7c673cae FG	169	ENCODE_FINISH(bl);
	170	}
	171
11fdf7f2	172	void decode(bufferlist::const_iterator& bl) {
7c673cae	173	DECODE_START(1, bl);
11fdf7f2	174	decode(metrics, bl);
7c673cae FG	175	DECODE_FINISH(bl);
	176	}
	177
	178	bool operator==(MDSHealth const &other) const
	179	{
	180	return metrics == other.metrics;
	181	}
	182	};
	183	WRITE_CLASS_ENCODER(MDSHealth)
	184
	185
9f95a23c	186	class MMDSBeacon : public PaxosServiceMessage {
11fdf7f2	187	private:
7c673cae	188
9f95a23c	189	static constexpr int HEAD_VERSION = 8;
11fdf7f2	190	static constexpr int COMPAT_VERSION = 6;
7c673cae FG	191
7c673cae FG	192	uuid_d fsid;
11fdf7f2	193	mds_gid_t global_id = MDS_GID_NONE;
7c673cae FG	194	string name;
7c673cae FG	195
11fdf7f2 TL	196	MDSMap::DaemonState state = MDSMap::STATE_NULL;
11fdf7f2 TL	197	version_t seq = 0;
7c673cae FG	198
	199	CompatSet compat;
	200
	201	MDSHealth health;
	202
	203	map<string, string> sys_info;
	204
11fdf7f2	205	uint64_t mds_features = 0;
7c673cae	206
9f95a23c TL	207	string fs;
9f95a23c TL	208
11fdf7f2	209	protected:
9f95a23c	210	MMDSBeacon() : PaxosServiceMessage(MSG_MDS_BEACON, 0, HEAD_VERSION, COMPAT_VERSION)
11fdf7f2	211	{
91327a77 AA	212	set_priority(CEPH_MSG_PRIO_HIGH);
91327a77 AA	213	}
11fdf7f2	214	MMDSBeacon(const uuid_d &f, mds_gid_t g, const string& n, epoch_t les, MDSMap::DaemonState st, version_t se, uint64_t feat) :
9f95a23c	215	PaxosServiceMessage(MSG_MDS_BEACON, les, HEAD_VERSION, COMPAT_VERSION),
7c673cae	216	fsid(f), global_id(g), name(n), state(st), seq(se),
11fdf7f2	217	mds_features(feat) {
91327a77	218	set_priority(CEPH_MSG_PRIO_HIGH);
7c673cae	219	}
7c673cae FG	220	~MMDSBeacon() override {}
	221
	222	public:
11fdf7f2 TL	223	const uuid_d& get_fsid() const { return fsid; }
	224	mds_gid_t get_global_id() const { return global_id; }
	225	const string& get_name() const { return name; }
	226	epoch_t get_last_epoch_seen() const { return version; }
	227	MDSMap::DaemonState get_state() const { return state; }
	228	version_t get_seq() const { return seq; }
	229	std::string_view get_type_name() const override { return "mdsbeacon"; }
7c673cae FG	230	uint64_t get_mds_features() const { return mds_features; }
	231
	232	CompatSet const& get_compat() const { return compat; }
	233	void set_compat(const CompatSet& c) { compat = c; }
	234
	235	MDSHealth const& get_health() const { return health; }
	236	void set_health(const MDSHealth &h) { health = h; }
	237
9f95a23c TL	238	const string& get_fs() const { return fs; }
	239	void set_fs(std::string_view s) { fs = s; }
	240
7c673cae FG	241	const map<string, string>& get_sys_info() const { return sys_info; }
	242	void set_sys_info(const map<string, string>& i) { sys_info = i; }
	243
	244	void print(ostream& out) const override {
9f95a23c TL	245	out << "mdsbeacon(" << global_id << "/" << name
	246	<< " " << ceph_mds_state_name(state);
	247	if (fs.size()) {
	248	out << " fs=" << fs;
	249	}
	250	out << " seq=" << seq << " v" << version << ")";
7c673cae FG	251	}
	252
	253	void encode_payload(uint64_t features) override {
11fdf7f2	254	using ceph::encode;
7c673cae	255	paxos_encode();
11fdf7f2 TL	256	encode(fsid, payload);
	257	encode(global_id, payload);
	258	encode((__u32)state, payload);
	259	encode(seq, payload);
	260	encode(name, payload);
	261	encode(MDS_RANK_NONE, payload);
	262	encode(std::string(), payload);
	263	encode(compat, payload);
	264	encode(health, payload);
7c673cae	265	if (state == MDSMap::STATE_BOOT) {
11fdf7f2	266	encode(sys_info, payload);
7c673cae	267	}
11fdf7f2 TL	268	encode(mds_features, payload);
	269	encode(FS_CLUSTER_ID_NONE, payload);
	270	encode(false, payload);
9f95a23c	271	encode(fs, payload);
7c673cae FG	272	}
7c673cae FG	273	void decode_payload() override {
11fdf7f2 TL	274	using ceph::decode;
11fdf7f2 TL	275	auto p = payload.cbegin();
7c673cae	276	paxos_decode(p);
11fdf7f2 TL	277	decode(fsid, p);
11fdf7f2 TL	278	decode(global_id, p);
f91f0fd5 TL	279	__u32 raw_state;
	280	decode(raw_state, p);
	281	state = (MDSMap::DaemonState)raw_state;
11fdf7f2 TL	282	decode(seq, p);
	283	decode(name, p);
	284	{
	285	mds_rank_t standby_for_rank;
	286	decode(standby_for_rank, p);
	287	}
	288	{
	289	std::string standby_for_name;
	290	decode(standby_for_name, p);
	291	}
	292	decode(compat, p);
	293	decode(health, p);
7c673cae	294	if (state == MDSMap::STATE_BOOT) {
11fdf7f2 TL	295	decode(sys_info, p);
	296	}
	297	decode(mds_features, p);
	298	{
	299	fs_cluster_id_t standby_for_fscid;
	300	decode(standby_for_fscid, p);
7c673cae	301	}
7c673cae	302	if (header.version >= 7) {
11fdf7f2 TL	303	bool standby_replay;
11fdf7f2 TL	304	decode(standby_replay, p);
7c673cae FG	305	}
	306
	307	if (header.version < 7 && state == MDSMap::STATE_STANDBY_REPLAY) {
	308	// Old MDS daemons request the state, instead of explicitly
	309	// advertising that they are configured as a replay daemon.
7c673cae FG	310	state = MDSMap::STATE_STANDBY;
7c673cae FG	311	}
9f95a23c TL	312	if (header.version >= 8) {
	313	decode(fs, p);
	314	}
7c673cae	315	}
9f95a23c TL	316	private:
	317	template<class T, typename... Args>
	318	friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
7c673cae FG	319	};
	320
	321	#endif