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diff --git a/src/messages/MOSDAlive.h b/src/messages/MOSDAlive.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_MOSDALIVE_H
+#define CEPH_MOSDALIVE_H
+
+#include "messages/PaxosServiceMessage.h"
+
+class MOSDAlive : public MessageInstance<MOSDAlive, PaxosServiceMessage> {
+public:
+  friend factory;
+
+  epoch_t want = 0;
+
+  MOSDAlive(epoch_t h, epoch_t w) : MessageInstance(MSG_OSD_ALIVE, h), want(w) { }
+  MOSDAlive() : MessageInstance(MSG_OSD_ALIVE, 0) {}
+private:
+  ~MOSDAlive() override {}
+
+public:
+  void encode_payload(uint64_t features) override {
+    paxos_encode();
+    using ceph::encode;
+    encode(want, payload);
+  }
+  void decode_payload() override {
+    auto p = payload.cbegin();
+    paxos_decode(p);
+    decode(want, p);
+  }
+
+  std::string_view get_type_name() const override { return "osd_alive"; }
+  void print(ostream &out) const override {
+    out << "osd_alive(want up_thru " << want << " have " << version << ")";
+  }
+  
+};
+
+#endif