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diff --git a/src/rocksdb/utilities/transactions/optimistic_transaction.h b/src/rocksdb/utilities/transactions/optimistic_transaction.h
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+++ b/src/rocksdb/utilities/transactions/optimistic_transaction.h
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+// Copyright (c) 2011-present, Facebook, Inc.  All rights reserved.
+//  This source code is licensed under both the GPLv2 (found in the
+//  COPYING file in the root directory) and Apache 2.0 License
+//  (found in the LICENSE.Apache file in the root directory).
+
+#pragma once
+
+#ifndef ROCKSDB_LITE
+
+#include <stack>
+#include <string>
+#include <unordered_map>
+#include <vector>
+
+#include "db/write_callback.h"
+#include "rocksdb/db.h"
+#include "rocksdb/slice.h"
+#include "rocksdb/snapshot.h"
+#include "rocksdb/status.h"
+#include "rocksdb/types.h"
+#include "rocksdb/utilities/transaction.h"
+#include "rocksdb/utilities/optimistic_transaction_db.h"
+#include "rocksdb/utilities/write_batch_with_index.h"
+#include "utilities/transactions/transaction_base.h"
+#include "utilities/transactions/transaction_util.h"
+
+namespace ROCKSDB_NAMESPACE {
+
+class OptimisticTransaction : public TransactionBaseImpl {
+ public:
+  OptimisticTransaction(OptimisticTransactionDB* db,
+                        const WriteOptions& write_options,
+                        const OptimisticTransactionOptions& txn_options);
+  // No copying allowed
+  OptimisticTransaction(const OptimisticTransaction&) = delete;
+  void operator=(const OptimisticTransaction&) = delete;
+
+  virtual ~OptimisticTransaction();
+
+  void Reinitialize(OptimisticTransactionDB* txn_db,
+                    const WriteOptions& write_options,
+                    const OptimisticTransactionOptions& txn_options);
+
+  Status Prepare() override;
+
+  Status Commit() override;
+
+  Status Rollback() override;
+
+  Status SetName(const TransactionName& name) override;
+
+ protected:
+  Status TryLock(ColumnFamilyHandle* column_family, const Slice& key,
+                 bool read_only, bool exclusive, const bool do_validate = true,
+                 const bool assume_tracked = false) override;
+
+ private:
+  ROCKSDB_FIELD_UNUSED OptimisticTransactionDB* const txn_db_;
+
+  friend class OptimisticTransactionCallback;
+
+  void Initialize(const OptimisticTransactionOptions& txn_options);
+
+  // Returns OK if it is safe to commit this transaction.  Returns Status::Busy
+  // if there are read or write conflicts that would prevent us from committing
+  // OR if we can not determine whether there would be any such conflicts.
+  //
+  // Should only be called on writer thread.
+  Status CheckTransactionForConflicts(DB* db);
+
+  void Clear() override;
+
+  void UnlockGetForUpdate(ColumnFamilyHandle* /* unused */,
+                          const Slice& /* unused */) override {
+    // Nothing to unlock.
+  }
+
+  Status CommitWithSerialValidate();
+
+  Status CommitWithParallelValidate();
+};
+
+// Used at commit time to trigger transaction validation
+class OptimisticTransactionCallback : public WriteCallback {
+ public:
+  explicit OptimisticTransactionCallback(OptimisticTransaction* txn)
+      : txn_(txn) {}
+
+  Status Callback(DB* db) override {
+    return txn_->CheckTransactionForConflicts(db);
+  }
+
+  bool AllowWriteBatching() override { return false; }
+
+ private:
+  OptimisticTransaction* txn_;
+};
+
+}  // namespace ROCKSDB_NAMESPACE
+
+#endif  // ROCKSDB_LITE