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diff --git a/src/ceph/src/common/CommandTable.h b/src/ceph/src/common/CommandTable.h
new file mode 100644
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--- /dev/null
+++ b/src/ceph/src/common/CommandTable.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) 2016 Red Hat Inc
+ *
+ * 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 COMMAND_TABLE_H_
+#define COMMAND_TABLE_H_
+
+#include "messages/MCommand.h"
+
+class CommandOp
+{
+  public:
+  ConnectionRef con;
+  ceph_tid_t tid;
+
+  std::vector<std::string> cmd;
+  bufferlist    inbl;
+  Context      *on_finish;
+  bufferlist   *outbl;
+  std::string  *outs;
+
+  MCommand *get_message(const uuid_d &fsid) const
+  {
+    MCommand *m = new MCommand(fsid);
+    m->cmd = cmd;
+    m->set_data(inbl);
+    m->set_tid(tid);
+
+    return m;
+  }
+
+  CommandOp(const ceph_tid_t t) : tid(t), on_finish(nullptr),
+                                  outbl(nullptr), outs(nullptr) {}
+  CommandOp() : tid(0), on_finish(nullptr), outbl(nullptr), outs(nullptr) {}
+};
+
+/**
+ * Hold client-side state for a collection of in-flight commands
+ * to a remote service.
+ */
+template<typename T>
+class CommandTable
+{
+protected:
+  ceph_tid_t last_tid;
+  std::map<ceph_tid_t, T> commands;
+
+public:
+
+  CommandTable()
+    : last_tid(0)
+  {}
+
+  ~CommandTable()
+  {
+    assert(commands.empty());
+  }
+
+  T& start_command()
+  {
+    ceph_tid_t tid = last_tid++;
+    commands.insert(std::make_pair(tid, T(tid)) );
+
+    return commands.at(tid);
+  }
+
+  const std::map<ceph_tid_t, T> &get_commands() const
+  {
+    return commands;
+  }
+
+  bool exists(ceph_tid_t tid) const
+  {
+    return commands.count(tid) > 0;
+  }
+
+  T& get_command(ceph_tid_t tid)
+  {
+    return commands.at(tid);
+  }
+
+  void erase(ceph_tid_t tid)
+  {
+    commands.erase(tid);
+  }
+
+  void clear() {
+    commands.clear();
+  }
+};
+
+#endif
+