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diff --git a/src/messages/MPGStatsAck.h b/src/messages/MPGStatsAck.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_MPGSTATSACK_H
+#define CEPH_MPGSTATSACK_H
+
+#include "osd/osd_types.h"
+
+class MPGStatsAck : public MessageInstance<MPGStatsAck> {
+public:
+  friend factory;
+
+  map<pg_t,pair<version_t,epoch_t> > pg_stat;
+  
+  MPGStatsAck() : MessageInstance(MSG_PGSTATSACK) {}
+
+private:
+  ~MPGStatsAck() override {}
+
+public:
+  std::string_view get_type_name() const override { return "pg_stats_ack"; }
+  void print(ostream& out) const override {
+    out << "pg_stats_ack(" << pg_stat.size() << " pgs tid " << get_tid() << ")";
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(pg_stat, payload);
+  }
+  void decode_payload() override {
+    auto p = payload.cbegin();
+    decode(pg_stat, p);
+  }
+};
+
+#endif