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diff --git a/src/test/librados_test_stub/TestMemCluster.h b/src/test/librados_test_stub/TestMemCluster.h
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+++ b/src/test/librados_test_stub/TestMemCluster.h
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+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#ifndef CEPH_TEST_MEM_CLUSTER_H
+#define CEPH_TEST_MEM_CLUSTER_H
+
+#include "test/librados_test_stub/TestCluster.h"
+#include "include/buffer.h"
+#include "include/interval_set.h"
+#include "include/int_types.h"
+#include "common/Cond.h"
+#include "common/Mutex.h"
+#include "common/RefCountedObj.h"
+#include "common/RWLock.h"
+#include <boost/shared_ptr.hpp>
+#include <list>
+#include <map>
+#include <set>
+#include <string>
+
+namespace librados {
+
+class TestMemCluster : public TestCluster {
+public:
+  typedef std::map<std::string, bufferlist> OMap;
+  typedef std::map<ObjectLocator, OMap> FileOMaps;
+  typedef std::map<ObjectLocator, bufferlist> FileTMaps;
+  typedef std::map<std::string, bufferlist> XAttrs;
+  typedef std::map<ObjectLocator, XAttrs> FileXAttrs;
+  typedef std::set<ObjectHandler*> ObjectHandlers;
+  typedef std::map<ObjectLocator, ObjectHandlers> FileHandlers;
+
+  struct File {
+    File();
+    File(const File &rhs);
+
+    bufferlist data;
+    time_t mtime;
+
+    uint64_t snap_id;
+    std::vector<uint64_t> snaps;
+    interval_set<uint64_t> snap_overlap;
+
+    bool exists;
+    RWLock lock;
+  };
+  typedef boost::shared_ptr<File> SharedFile;
+
+  typedef std::list<SharedFile> FileSnapshots;
+  typedef std::map<ObjectLocator, FileSnapshots> Files;
+
+  typedef std::set<uint64_t> SnapSeqs;
+  struct Pool : public RefCountedObject {
+    Pool();
+
+    int64_t pool_id = 0;
+
+    SnapSeqs snap_seqs;
+    uint64_t snap_id = 1;
+
+    RWLock file_lock;
+    Files files;
+    FileOMaps file_omaps;
+    FileTMaps file_tmaps;
+    FileXAttrs file_xattrs;
+    FileHandlers file_handlers;
+  };
+
+  TestMemCluster();
+  ~TestMemCluster() override;
+
+  TestRadosClient *create_rados_client(CephContext *cct) override;
+
+  int register_object_handler(int64_t pool_id, const ObjectLocator& locator,
+                              ObjectHandler* object_handler) override;
+  void unregister_object_handler(int64_t pool_id, const ObjectLocator& locator,
+                                 ObjectHandler* object_handler) override;
+
+  int pool_create(const std::string &pool_name);
+  int pool_delete(const std::string &pool_name);
+  int pool_get_base_tier(int64_t pool_id, int64_t* base_tier);
+  int pool_list(std::list<std::pair<int64_t, std::string> >& v);
+  int64_t pool_lookup(const std::string &name);
+  int pool_reverse_lookup(int64_t id, std::string *name);
+
+  Pool *get_pool(int64_t pool_id);
+  Pool *get_pool(const std::string &pool_name);
+
+  void allocate_client(uint32_t *nonce, uint64_t *global_id);
+  void deallocate_client(uint32_t nonce);
+
+  bool is_blacklisted(uint32_t nonce) const;
+  void blacklist(uint32_t nonce);
+
+  void transaction_start(const ObjectLocator& locator);
+  void transaction_finish(const ObjectLocator& locator);
+
+private:
+
+  typedef std::map<std::string, Pool*>		Pools;
+  typedef std::set<uint32_t> Blacklist;
+
+  mutable Mutex m_lock;
+
+  Pools	m_pools;
+  int64_t m_pool_id = 0;
+
+  uint32_t m_next_nonce;
+  uint64_t m_next_global_id = 1234;
+
+  Blacklist m_blacklist;
+
+  Cond m_transaction_cond;
+  std::set<ObjectLocator> m_transactions;
+
+  Pool *get_pool(const Mutex& lock, int64_t pool_id);
+
+};
+
+} // namespace librados
+
+#endif // CEPH_TEST_MEM_CLUSTER_H