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diff --git a/src/messages/MMonJoin.h b/src/messages/MMonJoin.h
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+++ b/src/messages/MMonJoin.h
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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.
+ * 
+ */
+
+#ifndef CEPH_MMONJOIN_H
+#define CEPH_MMONJOIN_H
+
+#include "messages/PaxosServiceMessage.h"
+
+class MMonJoin final : public PaxosServiceMessage {
+public:
+  static constexpr int HEAD_VERSION = 3;
+  static constexpr int COMPAT_VERSION = 2;
+
+  uuid_d fsid;
+  std::string name;
+  entity_addrvec_t addrs;
+  /* The location members are for stretch mode. crush_loc is the location
+   * (generally just a "datacenter=<foo>" statement) of the monitor. The
+   * force_loc is whether the mon cluster should replace a previously-known
+   * location. Generally the monitor will force an update if it's given a
+   * location from the CLI on boot-up, and then never force again (so that it
+   * can be moved/updated via the ceph tool from elsewhere). */
+  map<string,string> crush_loc;
+  bool force_loc{false};
+
+  MMonJoin() : PaxosServiceMessage{MSG_MON_JOIN, 0, HEAD_VERSION, COMPAT_VERSION} {}
+  MMonJoin(uuid_d &f, std::string n, const entity_addrvec_t& av)
+    : PaxosServiceMessage{MSG_MON_JOIN, 0, HEAD_VERSION, COMPAT_VERSION},
+      fsid(f), name(n), addrs(av)
+  { }
+  MMonJoin(uuid_d &f, std::string n, const entity_addrvec_t& av, const map<string,string>& cloc, bool force)
+    : PaxosServiceMessage{MSG_MON_JOIN, 0, HEAD_VERSION, COMPAT_VERSION},
+      fsid(f), name(n), addrs(av), crush_loc(cloc), force_loc(force)
+  { }
+  
+private:
+  ~MMonJoin() final {}
+
+public:
+  std::string_view get_type_name() const override { return "mon_join"; }
+  void print(std::ostream& o) const override {
+    o << "mon_join(" << name << " " << addrs << " " << crush_loc << ")";
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    paxos_encode();
+    encode(fsid, payload);
+    encode(name, payload);
+    if (HAVE_FEATURE(features, SERVER_NAUTILUS)) {
+      header.version = HEAD_VERSION;
+      header.compat_version = COMPAT_VERSION;
+      encode(addrs, payload, features);
+      encode(crush_loc, payload);
+      encode(force_loc, payload);
+    } else {
+      header.version = 1;
+      header.compat_version = 1;
+      encode(addrs.legacy_addr(), payload, features);
+    }
+  }
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    paxos_decode(p);
+    decode(fsid, p);
+    decode(name, p);
+    if (header.version == 1) {
+      entity_addr_t addr;
+      decode(addr, p);
+      addrs = entity_addrvec_t(addr);
+    } else {
+      decode(addrs, p);
+      if (header.version >= 3) {
+	decode(crush_loc, p);
+	decode(force_loc, p);
+      }
+    }
+  }
+};
+
+#endif