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diff --git a/src/rocksdb/db/write_batch_internal.h b/src/rocksdb/db/write_batch_internal.h
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+++ b/src/rocksdb/db/write_batch_internal.h
@@ -0,0 +1,240 @@
+//  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).
+//
+// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file. See the AUTHORS file for names of contributors.
+
+#pragma once
+#include <vector>
+#include "db/write_thread.h"
+#include "rocksdb/types.h"
+#include "rocksdb/write_batch.h"
+#include "rocksdb/db.h"
+#include "rocksdb/options.h"
+#include "util/autovector.h"
+
+namespace rocksdb {
+
+class MemTable;
+class FlushScheduler;
+class ColumnFamilyData;
+
+class ColumnFamilyMemTables {
+ public:
+  virtual ~ColumnFamilyMemTables() {}
+  virtual bool Seek(uint32_t column_family_id) = 0;
+  // returns true if the update to memtable should be ignored
+  // (useful when recovering from log whose updates have already
+  // been processed)
+  virtual uint64_t GetLogNumber() const = 0;
+  virtual MemTable* GetMemTable() const = 0;
+  virtual ColumnFamilyHandle* GetColumnFamilyHandle() = 0;
+  virtual ColumnFamilyData* current() { return nullptr; }
+};
+
+class ColumnFamilyMemTablesDefault : public ColumnFamilyMemTables {
+ public:
+  explicit ColumnFamilyMemTablesDefault(MemTable* mem)
+      : ok_(false), mem_(mem) {}
+
+  bool Seek(uint32_t column_family_id) override {
+    ok_ = (column_family_id == 0);
+    return ok_;
+  }
+
+  uint64_t GetLogNumber() const override { return 0; }
+
+  MemTable* GetMemTable() const override {
+    assert(ok_);
+    return mem_;
+  }
+
+  ColumnFamilyHandle* GetColumnFamilyHandle() override { return nullptr; }
+
+ private:
+  bool ok_;
+  MemTable* mem_;
+};
+
+// WriteBatchInternal provides static methods for manipulating a
+// WriteBatch that we don't want in the public WriteBatch interface.
+class WriteBatchInternal {
+ public:
+
+  // WriteBatch header has an 8-byte sequence number followed by a 4-byte count.
+  static const size_t kHeader = 12;
+
+  // WriteBatch methods with column_family_id instead of ColumnFamilyHandle*
+  static Status Put(WriteBatch* batch, uint32_t column_family_id,
+                    const Slice& key, const Slice& value);
+
+  static Status Put(WriteBatch* batch, uint32_t column_family_id,
+                    const SliceParts& key, const SliceParts& value);
+
+  static Status Delete(WriteBatch* batch, uint32_t column_family_id,
+                       const SliceParts& key);
+
+  static Status Delete(WriteBatch* batch, uint32_t column_family_id,
+                       const Slice& key);
+
+  static Status SingleDelete(WriteBatch* batch, uint32_t column_family_id,
+                             const SliceParts& key);
+
+  static Status SingleDelete(WriteBatch* batch, uint32_t column_family_id,
+                             const Slice& key);
+
+  static Status DeleteRange(WriteBatch* b, uint32_t column_family_id,
+                            const Slice& begin_key, const Slice& end_key);
+
+  static Status DeleteRange(WriteBatch* b, uint32_t column_family_id,
+                            const SliceParts& begin_key,
+                            const SliceParts& end_key);
+
+  static Status Merge(WriteBatch* batch, uint32_t column_family_id,
+                      const Slice& key, const Slice& value);
+
+  static Status Merge(WriteBatch* batch, uint32_t column_family_id,
+                      const SliceParts& key, const SliceParts& value);
+
+  static Status PutBlobIndex(WriteBatch* batch, uint32_t column_family_id,
+                             const Slice& key, const Slice& value);
+
+  static Status MarkEndPrepare(WriteBatch* batch, const Slice& xid,
+                               const bool write_after_commit = true,
+                               const bool unprepared_batch = false);
+
+  static Status MarkRollback(WriteBatch* batch, const Slice& xid);
+
+  static Status MarkCommit(WriteBatch* batch, const Slice& xid);
+
+  static Status InsertNoop(WriteBatch* batch);
+
+  // Return the number of entries in the batch.
+  static int Count(const WriteBatch* batch);
+
+  // Set the count for the number of entries in the batch.
+  static void SetCount(WriteBatch* batch, int n);
+
+  // Return the sequence number for the start of this batch.
+  static SequenceNumber Sequence(const WriteBatch* batch);
+
+  // Store the specified number as the sequence number for the start of
+  // this batch.
+  static void SetSequence(WriteBatch* batch, SequenceNumber seq);
+
+  // Returns the offset of the first entry in the batch.
+  // This offset is only valid if the batch is not empty.
+  static size_t GetFirstOffset(WriteBatch* batch);
+
+  static Slice Contents(const WriteBatch* batch) {
+    return Slice(batch->rep_);
+  }
+
+  static size_t ByteSize(const WriteBatch* batch) {
+    return batch->rep_.size();
+  }
+
+  static Status SetContents(WriteBatch* batch, const Slice& contents);
+
+  static Status CheckSlicePartsLength(const SliceParts& key,
+                                      const SliceParts& value);
+
+  // Inserts batches[i] into memtable, for i in 0..num_batches-1 inclusive.
+  //
+  // If ignore_missing_column_families == true. WriteBatch
+  // referencing non-existing column family will be ignored.
+  // If ignore_missing_column_families == false, processing of the
+  // batches will be stopped if a reference is found to a non-existing
+  // column family and InvalidArgument() will be returned.  The writes
+  // in batches may be only partially applied at that point.
+  //
+  // If log_number is non-zero, the memtable will be updated only if
+  // memtables->GetLogNumber() >= log_number.
+  //
+  // If flush_scheduler is non-null, it will be invoked if the memtable
+  // should be flushed.
+  //
+  // Under concurrent use, the caller is responsible for making sure that
+  // the memtables object itself is thread-local.
+  static Status InsertInto(
+      WriteThread::WriteGroup& write_group, SequenceNumber sequence,
+      ColumnFamilyMemTables* memtables, FlushScheduler* flush_scheduler,
+      bool ignore_missing_column_families = false, uint64_t log_number = 0,
+      DB* db = nullptr, bool concurrent_memtable_writes = false,
+      bool seq_per_batch = false, bool batch_per_txn = true);
+
+  // Convenience form of InsertInto when you have only one batch
+  // next_seq returns the seq after last sequence number used in MemTable insert
+  static Status InsertInto(
+      const WriteBatch* batch, ColumnFamilyMemTables* memtables,
+      FlushScheduler* flush_scheduler,
+      bool ignore_missing_column_families = false, uint64_t log_number = 0,
+      DB* db = nullptr, bool concurrent_memtable_writes = false,
+      SequenceNumber* next_seq = nullptr, bool* has_valid_writes = nullptr,
+      bool seq_per_batch = false, bool batch_per_txn = true);
+
+  static Status InsertInto(WriteThread::Writer* writer, SequenceNumber sequence,
+                           ColumnFamilyMemTables* memtables,
+                           FlushScheduler* flush_scheduler,
+                           bool ignore_missing_column_families = false,
+                           uint64_t log_number = 0, DB* db = nullptr,
+                           bool concurrent_memtable_writes = false,
+                           bool seq_per_batch = false, size_t batch_cnt = 0,
+                           bool batch_per_txn = true);
+
+  static Status Append(WriteBatch* dst, const WriteBatch* src,
+                       const bool WAL_only = false);
+
+  // Returns the byte size of appending a WriteBatch with ByteSize
+  // leftByteSize and a WriteBatch with ByteSize rightByteSize
+  static size_t AppendedByteSize(size_t leftByteSize, size_t rightByteSize);
+
+  // This write batch includes the latest state that should be persisted. Such
+  // state meant to be used only during recovery.
+  static void SetAsLastestPersistentState(WriteBatch* b);
+  static bool IsLatestPersistentState(const WriteBatch* b);
+};
+
+// LocalSavePoint is similar to a scope guard
+class LocalSavePoint {
+ public:
+  explicit LocalSavePoint(WriteBatch* batch)
+      : batch_(batch),
+        savepoint_(batch->GetDataSize(), batch->Count(),
+                   batch->content_flags_.load(std::memory_order_relaxed))
+#ifndef NDEBUG
+        ,
+        committed_(false)
+#endif
+  {
+  }
+
+#ifndef NDEBUG
+  ~LocalSavePoint() { assert(committed_); }
+#endif
+  Status commit() {
+#ifndef NDEBUG
+    committed_ = true;
+#endif
+    if (batch_->max_bytes_ && batch_->rep_.size() > batch_->max_bytes_) {
+      batch_->rep_.resize(savepoint_.size);
+      WriteBatchInternal::SetCount(batch_, savepoint_.count);
+      batch_->content_flags_.store(savepoint_.content_flags,
+                                   std::memory_order_relaxed);
+      return Status::MemoryLimit();
+    }
+    return Status::OK();
+  }
+
+ private:
+  WriteBatch* batch_;
+  SavePoint savepoint_;
+#ifndef NDEBUG
+  bool committed_;
+#endif
+};
+
+}  // namespace rocksdb