diff --git a/CMakeLists.txt b/CMakeLists.txt
index 34f77692a24f502d9ad960ea5a0beeb0ea00de5b..9fa01954133875735abc7024f33ade80c664ced2 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -7,9 +7,6 @@ endif()
 
 add_compile_definitions($<$<COMPILE_LANGUAGE:CXX>:_GLIBCXX_USE_CXX11_ABI=0>)
 
-option(HIDDEN_DMB_SYMBOLS "hidden dmb symbols" FALSE)
-mark_as_advanced(HIDDEN_DMB_SYMBOLS)
-
 add_subdirectory(src)
 
 # Check if oblogmsg is being used directly or via add_subdirectory
diff --git a/benchmark/lmTest.cpp b/benchmark/lmTest.cpp
index 26a4aa0352af8dc96718b5e1c537fe411538740b..d6ed5015ab087c575757bf23b43b56fb2757dbcd 100644
--- a/benchmark/lmTest.cpp
+++ b/benchmark/lmTest.cpp
@@ -16,10 +16,10 @@
 #endif
 #include "itoa.h"
 #include "StrArray.h"
-
 using namespace std;
 using namespace oceanbase::logmessage;
 
+LogMsgBuf* lmb = NULL;
 const char* tableMeta = "[MYTEST,litter]\n"
                         "id,MYSQL_TYPE_LONG,8,P,\n"
                         "num1,MYSQL_TYPE_SHORT,4,,\n"
@@ -618,7 +618,7 @@ LogRecordImpl* createRecordByMeta(ITableMeta* m, int type, bool string_or_point,
 #ifdef LMB
   LogRecordImpl* r = new LogRecordImpl(true, true);
 #else
-  LogRecordImpl* r = new LogRecordImpl(true, true);
+  LogRecordImpl* r = new LogRecordImpl(true, false);
 #endif
   char *buf = NULL, *pos = NULL;
   int size = 0, csize = 0;
@@ -776,7 +776,7 @@ int dm_speed_test(int type, bool string_or_point)
       clock_gettime(CLOCK_REALTIME, &s);
       for (int i = 0; i < sc; i++) {
 #ifdef LMB
-        lrl[i]->toString(&size);
+        lrl[i]->toString(&size,lmb);
 #else
         lrl[i]->toString();
 #endif
@@ -818,13 +818,13 @@ int dm_speed_test(int type, bool string_or_point)
 int main(int argc, char* argv[])
 {
 #ifdef LMB
-  LogMsgInit();
+  lmb = new LogMsgBuf();
 #endif
   dm_speed_test(EINSERT, false);
   dm_speed_test(EUPDATE, false);
   dm_speed_test(EDELETE, false);
 #ifdef LMB
-  LogMsgDestroy();
+  delete lmb;
 #endif
   return 0;
 }
diff --git a/include/LogMsgBuf.h b/include/LogMsgBuf.h
index ee6c97b4a997499f89b501571477011410a8718e..dda127c948515e0663a80e88258c2090baf4c0ff 100644
--- a/include/LogMsgBuf.h
+++ b/include/LogMsgBuf.h
@@ -19,24 +19,35 @@ namespace oceanbase {
 namespace logmessage {
 
 struct BinLogBuf;
-int LogMsgInit();
-int LogMsgLocalInit();
-void LogMsgDestroy();
-void LogMsgLocalDestroy();
-const char* LogMsgGetValueByOffset(size_t offset);
-size_t LogMsgAppendString(const char* string, size_t size);
-size_t LogMsgAppendString(const std::string& string);
-size_t LogMsgAppendBuf(const char* data, size_t size);
-size_t LogMsgAppendBuf(const std::string& string);
-size_t LogMsgAppendBuf(const BinLogBuf* sa, size_t size);
-size_t LogMsgAppendStringArray(std::vector<std::string*>& sa);
-size_t LogMsgAppendStringArray(const char** sa, size_t size);
-void LogMsgSetHead(size_t size);
-void LogMsgCopyHead(const char* head, size_t size);
-void LogMsgFroceSetHeadSize(size_t size);
-const char* LogMsgGetString(size_t* size);
-size_t LogMsgAppendDataArray(std::vector<long>& sa);
-size_t LogMsgAppendDataArray(uint8_t* sa, size_t size);
+class LogMsgBuf {
+public:
+  LogMsgBuf();
+  ~LogMsgBuf();
+  const char* getValueByOffset(size_t offset);
+  size_t appendString(const char* string, size_t size);
+  size_t appendString(const std::string& string);
+  size_t appendBuf(const char* data, size_t size);
+  size_t appendBuf(const std::string& string);
+  size_t appendBuf(const BinLogBuf* sa, size_t size);
+  size_t appendStringArray(std::vector<std::string*>& sa);
+  size_t appendStringArray(const char** sa, size_t size);
+  void setHead(size_t size);
+  void copyHead(const char* head, size_t size);
+  void froceSetHeadSize(size_t size);
+  const char* getString(size_t* size);
+  size_t appendDataArray(std::vector<long>& sa);
+  size_t appendDataArray(uint8_t* sa, size_t size);
+
+private:
+  inline void checkBuf(size_t size, char*& pos, uint32_t*& s, char*& head);
+
+private:
+  char* buf;
+  size_t bufSize;
+  size_t bufPos;
+  char* defaultBuf;
+  size_t avg_size;
+};
 
 }  // namespace logmessage
 }  // namespace oceanbase
diff --git a/include/LogRecord.h b/include/LogRecord.h
index f45b7b943854e1b449b32f2cc79ce09aae3bca24..6564b7d8d0ca75c14d6a4503de3b6c43ddd66451 100644
--- a/include/LogRecord.h
+++ b/include/LogRecord.h
@@ -15,6 +15,7 @@ See the Mulan PSL v2 for more details. */
 #include <cstdint>
 #include "UserData.h"
 #include "BinLogBuf.h"
+#include "LogMsgBuf.h"
 
 namespace oceanbase {
 namespace logmessage {
@@ -234,7 +235,7 @@ public:
    * serialize
    * @return serialized ptr
    */
-  virtual const char* toString(size_t* size, bool reserveMemory = false) = 0;
+  virtual const char* toString(size_t* size, LogMsgBuf* lmb = NULL, bool reserveMemory = false) = 0;
 
   /**
    * @return serialized ptr
@@ -272,7 +273,7 @@ class LogRecordImpl : public ILogRecord {
 public:
   LogRecordImpl(time_t timestamp, ITableMeta* tblMeta);
   LogRecordImpl(const void* ptr, size_t size);
-  LogRecordImpl(bool creating = true, bool useDMB = false);
+  LogRecordImpl(bool creating = true, bool useLMB = false);
   virtual ~LogRecordImpl();
 
 public:
@@ -403,7 +404,7 @@ public:
 
   virtual size_t getRealSize();
 
-  virtual const char* toString(size_t* size, bool reserveMemory = false);
+  virtual const char* toString(size_t* size, LogMsgBuf* lmb = NULL, bool reserveMemory = false);
 
   virtual const char* getFormatedString(size_t* size);
 
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 79313657c03930f52eb57cc746008e950b8f70e4..5d65f9974c75d1b96699bded6738a18cf18e6946 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -21,7 +21,6 @@ foreach(T IN ITEMS oblogmsg_shared oblogmsg_static)
   target_include_directories(${T} PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}
                                   PUBLIC  $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/../include>)
 endforeach()
-target_compile_definitions(oblogmsg_static PRIVATE $<$<BOOL:${HIDDEN_DMB_SYMBOLS}>:_HIDDEN_DMB_SYMBOLS>)
 # ensure that the build results can be run on systems with lower libstdc++ version than the build system
 target_link_libraries(oblogmsg_shared PRIVATE -static-libstdc++)
 
diff --git a/src/LogMsgBuf.cpp b/src/LogMsgBuf.cpp
index 1d6a05dde740f65d1ba1d31775c63d983a837461..a74be730b4e2d3d6ef46c1e22a77bcbcced672d5 100644
--- a/src/LogMsgBuf.cpp
+++ b/src/LogMsgBuf.cpp
@@ -19,161 +19,107 @@ See the Mulan PSL v2 for more details. */
 namespace oceanbase {
 namespace logmessage {
 
-
-#ifdef _HIDDEN_DMB_SYMBOLS
-  #define VISIBILITY_HIDDEN __attribute__((visibility("hidden")))
-#else
-  #define VISIBILITY_HIDDEN
-#endif
-
-typedef struct _LogMsgBuf {
-  char* buf;
-  size_t bufSize;
-  size_t bufPos;
-  char* defaultBuf;
-  size_t avg_size;
-} LogMsgBuf;
 #define LogMsgHeadSize (sizeof(MsgHeader) + sizeof(COUNT_TYPE))
 #define DefaultLogMsgBufSize 1024 * 1024 * 32
 #define LOG_MSG_MAX_TAIL_SIZE 1024
 
-static LogMsgBuf lmb_global = {NULL, 0, 0, NULL, 0};
-static __thread LogMsgBuf* lmb = &lmb_global;
-
-static inline void lm_check_buf(LogMsgBuf* lmbuf, size_t size, char*& pos, STRLEN_TYPE*& s, char*& head)
-{
-  if (lmbuf->bufSize < size + (pos - lmbuf->buf) + LOG_MSG_MAX_TAIL_SIZE) {
-    char* tmp = new char[lmbuf->bufSize = (pos - lmbuf->buf) + 2 * (size) + LOG_MSG_MAX_TAIL_SIZE];
-    memcpy(tmp, lmbuf->buf, pos - lmbuf->buf);
-    pos = tmp + (pos - lmbuf->buf);
-    s = (STRLEN_TYPE*)(tmp + ((char*)s - lmbuf->buf));
-    head = tmp + ((char*)(head)-lmbuf->buf);
-    if (lmbuf->buf != lmbuf->defaultBuf)
-      delete[] lmbuf->buf;
-    lmbuf->buf = tmp;
-  }
-}
-
-VISIBILITY_HIDDEN int LogMsgLocalInit()
+inline void LogMsgBuf::checkBuf(size_t size, char*& pos, STRLEN_TYPE*& s, char*& head)
 {
-  LogMsgLocalDestroy();
-  if (NULL == (lmb = new LogMsgBuf))
-    return -1;
-  if (NULL == (lmb->buf = new char[lmb->bufSize = DefaultLogMsgBufSize])) {
-    delete lmb;
-    lmb = &lmb_global;
-    return -1;
+  if (bufSize < size + (pos - buf) + LOG_MSG_MAX_TAIL_SIZE) {
+    char* tmp = new char[bufSize = (pos - buf) + 2 * (size) + LOG_MSG_MAX_TAIL_SIZE];
+    memcpy(tmp, buf, pos - buf);
+    pos = tmp + (pos - buf);
+    s = (STRLEN_TYPE*)(tmp + ((char*)s - buf));
+    head = tmp + ((char*)(head)-buf);
+    if (buf != defaultBuf)
+      delete[] buf;
+    buf = tmp;
   }
-  lmb->defaultBuf = lmb->buf;
-  lmb->bufPos = 0;
-  return 0;
 }
 
-VISIBILITY_HIDDEN void LogMsgLocalDestroy()
+LogMsgBuf::LogMsgBuf()
 {
-  if (lmb == &lmb_global)
-    return;
-
-  if (lmb != NULL) {
-    if (lmb->buf != NULL)
-      delete[] lmb->buf;
-    if (lmb->defaultBuf != lmb->buf && lmb->defaultBuf != NULL)
-      delete[] lmb->defaultBuf;
-    delete lmb;
-    lmb = &lmb_global;
-  }
-}
-
-VISIBILITY_HIDDEN int LogMsgInit()
-{
-  if (lmb != &lmb_global) {
-    LogMsgLocalDestroy();
-    lmb = &lmb_global;
-  }
-  LogMsgDestroy();
-  if (NULL == (lmb_global.buf = new char[lmb_global.bufSize = DefaultLogMsgBufSize]))
-    return -1;
-  lmb_global.defaultBuf = lmb_global.buf;
-  lmb_global.bufPos = 0;
-  return 0;
+  buf = new char[bufSize = DefaultLogMsgBufSize];
+  defaultBuf = buf;
+  bufPos = 0;
 }
 
-VISIBILITY_HIDDEN void LogMsgDestroy()
+LogMsgBuf::~LogMsgBuf()
 {
-  if (lmb != &lmb_global)
-    return;
-  if (lmb->buf != NULL)
-    delete[] lmb->buf;
-  if (lmb->defaultBuf != lmb->buf && lmb->defaultBuf != NULL)
-    delete[] lmb->defaultBuf;
-  lmb->buf = lmb->defaultBuf = NULL;
+  if (buf != NULL)
+    delete[] buf;
+  if (defaultBuf != buf && defaultBuf !=NULL)
+    delete[] defaultBuf;
+  buf = NULL;
+  defaultBuf = NULL;
+  bufPos = 0;
 }
 
-VISIBILITY_HIDDEN const char* LogMsgGetValueByOffset(size_t offset)
+const char* LogMsgBuf::getValueByOffset(size_t offset)
 {
-  return lmb->buf + offset + LogMsgHeadSize + sizeof(DT_TYPE) + sizeof(COUNT_TYPE);
+  return buf + offset + LogMsgHeadSize + sizeof(DT_TYPE) + sizeof(COUNT_TYPE);
 }
 
-VISIBILITY_HIDDEN size_t LogMsgAppendString(const char* string, size_t size)
+size_t LogMsgBuf::appendString(const char* string, size_t size)
 {
-  size_t offset = lmb->bufPos - LogMsgHeadSize;
-  *(DT_TYPE*)(lmb->buf + lmb->bufPos) = (DT_TYPE)(DT_STRING);
+  size_t offset = bufPos - LogMsgHeadSize;
+  *(DT_TYPE*)(buf + bufPos) = (DT_TYPE)(DT_STRING);
   if (string == NULL) {
-    (*(DT_TYPE*)(lmb->buf + lmb->bufPos)) |= DC_NULL;
-    return (lmb->bufPos += sizeof(DT_TYPE));
+    (*(DT_TYPE*)(buf + bufPos)) |= DC_NULL;
+    return (bufPos += sizeof(DT_TYPE));
   }
-  *(STRLEN_TYPE*)(lmb->buf + lmb->bufPos + sizeof(DT_TYPE)) = size + 1;
-  toLeEndian(lmb->buf + lmb->bufPos + sizeof(DT_TYPE), sizeof(STRLEN_TYPE));
-  memcpy(lmb->buf + lmb->bufPos + sizeof(DT_TYPE) + sizeof(STRLEN_TYPE), string, size);
-  lmb->bufPos += (sizeof(DT_TYPE) + sizeof(STRLEN_TYPE) + size) + 1;
-  lmb->buf[lmb->bufPos - 1] = 0;
+  *(STRLEN_TYPE*)(buf + bufPos + sizeof(DT_TYPE)) = size + 1;
+  toLeEndian(buf + bufPos + sizeof(DT_TYPE), sizeof(STRLEN_TYPE));
+  memcpy(buf + bufPos + sizeof(DT_TYPE) + sizeof(STRLEN_TYPE), string, size);
+  bufPos += (sizeof(DT_TYPE) + sizeof(STRLEN_TYPE) + size) + 1;
+  buf[bufPos - 1] = 0;
   return offset;
 }
-VISIBILITY_HIDDEN size_t LogMsgAppendString(const std::string& string)
+size_t LogMsgBuf::appendString(const std::string& string)
 {
-  size_t offset = lmb->bufPos - LogMsgHeadSize, size = string.size();
-  *(DT_TYPE*)(lmb->buf + lmb->bufPos) = (DT_TYPE)(DT_STRING);
+  size_t offset = bufPos - LogMsgHeadSize, size = string.size();
+  *(DT_TYPE*)(buf + bufPos) = (DT_TYPE)(DT_STRING);
   if (size == 0) {
-    (*(DT_TYPE*)(lmb->buf + lmb->bufPos)) |= DC_NULL;
-    return (lmb->bufPos += sizeof(DT_TYPE));
+    (*(DT_TYPE*)(buf + bufPos)) |= DC_NULL;
+    return (bufPos += sizeof(DT_TYPE));
   }
-  *(STRLEN_TYPE*)(lmb->buf + lmb->bufPos + sizeof(DT_TYPE)) = size + 1;
-  toLeEndian(lmb->buf + lmb->bufPos + sizeof(DT_TYPE), sizeof(STRLEN_TYPE));
-  strncpy(lmb->buf + lmb->bufPos + sizeof(DT_TYPE) + sizeof(STRLEN_TYPE), string.c_str(), size + 1);
-  lmb->bufPos += (sizeof(DT_TYPE) + sizeof(STRLEN_TYPE) + size + 1);
+  *(STRLEN_TYPE*)(buf + bufPos + sizeof(DT_TYPE)) = size + 1;
+  toLeEndian(buf + bufPos + sizeof(DT_TYPE), sizeof(STRLEN_TYPE));
+  strncpy(buf + bufPos + sizeof(DT_TYPE) + sizeof(STRLEN_TYPE), string.c_str(), size + 1);
+  bufPos += (sizeof(DT_TYPE) + sizeof(STRLEN_TYPE) + size + 1);
   return offset;
 }
-VISIBILITY_HIDDEN size_t LogMsgAppendBuf(const char* data, size_t size)
+size_t LogMsgBuf::appendBuf(const char* data, size_t size)
 {
-  size_t offset = lmb->bufPos - LogMsgHeadSize;
-  memcpy(lmb->buf + lmb->bufPos, data, size);
-  lmb->bufPos += size;
+  size_t offset = bufPos - LogMsgHeadSize;
+  memcpy(buf + bufPos, data, size);
+  bufPos += size;
   return offset;
 }
-VISIBILITY_HIDDEN size_t LogMsgAppendBuf(const std::string& string)
+size_t LogMsgBuf::appendBuf(const std::string& string)
 {
-  size_t offset = lmb->bufPos - LogMsgHeadSize;
-  memcpy(lmb->buf + lmb->bufPos, string.c_str(), string.size());
-  lmb->bufPos += string.size();
+  size_t offset = bufPos - LogMsgHeadSize;
+  memcpy(buf + bufPos, string.c_str(), string.size());
+  bufPos += string.size();
   return offset;
 }
 
-VISIBILITY_HIDDEN size_t LogMsgAppendBuf(const BinLogBuf* sa, size_t size)
+size_t LogMsgBuf::appendBuf(const BinLogBuf* sa, size_t size)
 {
-  size_t offset = lmb->bufPos - LogMsgHeadSize;
-  *(DT_TYPE*)(lmb->buf + lmb->bufPos) = (DT_TYPE)(DT_STRING | DC_ARRAY);
-  lmb->bufPos += sizeof(DT_TYPE);
+  size_t offset = bufPos - LogMsgHeadSize;
+  *(DT_TYPE*)(buf + bufPos) = (DT_TYPE)(DT_STRING | DC_ARRAY);
+  bufPos += sizeof(DT_TYPE);
   if (sa == NULL || size == 0) {
-    *(COUNT_TYPE*)(lmb->buf + lmb->bufPos) = (COUNT_TYPE)(0);
-    toLeEndian(lmb->buf + lmb->bufPos, sizeof(COUNT_TYPE));
-    lmb->bufPos += sizeof(COUNT_TYPE);
+    *(COUNT_TYPE*)(buf + bufPos) = (COUNT_TYPE)(0);
+    toLeEndian(buf + bufPos, sizeof(COUNT_TYPE));
+    bufPos += sizeof(COUNT_TYPE);
     return offset;
   }
-  *(COUNT_TYPE*)(lmb->buf + lmb->bufPos) = (COUNT_TYPE)(size);
-  toLeEndian(lmb->buf + lmb->bufPos, sizeof(COUNT_TYPE));
-  lmb->bufPos += sizeof(COUNT_TYPE);
+  *(COUNT_TYPE*)(buf + bufPos) = (COUNT_TYPE)(size);
+  toLeEndian(buf + bufPos, sizeof(COUNT_TYPE));
+  bufPos += sizeof(COUNT_TYPE);
   COUNT_TYPE i = 0;
-  char *pos = lmb->buf + lmb->bufPos, *head;
+  char *pos = buf + bufPos, *head;
   STRLEN_TYPE* s = (STRLEN_TYPE*)pos;
   pos += sizeof(STRLEN_TYPE) * (size + 1);
   head = pos;
@@ -181,7 +127,7 @@ VISIBILITY_HIDDEN size_t LogMsgAppendBuf(const BinLogBuf* sa, size_t size)
     s[i] = pos - head;
     toLeEndian(&(s[i]), sizeof(STRLEN_TYPE));
     if (sa[i].buf != NULL) {
-      lm_check_buf(lmb, sa[i].buf_used_size, pos, s, head);
+      checkBuf(sa[i].buf_used_size, pos, s, head);
       memcpy(pos, sa[i].buf, sa[i].buf_used_size);
       pos[sa[i].buf_used_size] = 0;
       pos += (sa[i].buf_used_size + 1);
@@ -189,24 +135,24 @@ VISIBILITY_HIDDEN size_t LogMsgAppendBuf(const BinLogBuf* sa, size_t size)
   }
   s[i] = pos - head;
   toLeEndian(&(s[i]), sizeof(STRLEN_TYPE));
-  lmb->bufPos = pos - lmb->buf;
+  bufPos = pos - buf;
   return offset;
 }
-VISIBILITY_HIDDEN size_t LogMsgAppendStringArray(std::vector<std::string*>& sa)
+size_t LogMsgBuf::appendStringArray(std::vector<std::string*>& sa)
 {
-  size_t offset = lmb->bufPos - LogMsgHeadSize, size = sa.size();
-  *(DT_TYPE*)(lmb->buf + lmb->bufPos) = (DT_TYPE)(DT_STRING | DC_ARRAY);
-  lmb->bufPos += sizeof(DT_TYPE);
-  *(COUNT_TYPE*)(lmb->buf + lmb->bufPos) = (COUNT_TYPE)(sa.size());
-  toLeEndian(lmb->buf + lmb->bufPos, sizeof(COUNT_TYPE));
+  size_t offset = bufPos - LogMsgHeadSize, size = sa.size();
+  *(DT_TYPE*)(buf + bufPos) = (DT_TYPE)(DT_STRING | DC_ARRAY);
+  bufPos += sizeof(DT_TYPE);
+  *(COUNT_TYPE*)(buf + bufPos) = (COUNT_TYPE)(sa.size());
+  toLeEndian(buf + bufPos, sizeof(COUNT_TYPE));
   if ((COUNT_TYPE)(sa.size()) == 0) {
-    lmb->bufPos += sizeof(COUNT_TYPE);
+    bufPos += sizeof(COUNT_TYPE);
     return offset;
   }
-  lmb->bufPos += sizeof(COUNT_TYPE);
+  bufPos += sizeof(COUNT_TYPE);
   STRLEN_TYPE len;
   COUNT_TYPE i = 0;
-  char *pos = lmb->buf + lmb->bufPos, *head;
+  char *pos = buf + bufPos, *head;
   STRLEN_TYPE* s = (STRLEN_TYPE*)pos;
   pos += sizeof(STRLEN_TYPE) * (size + 1);
   head = pos;
@@ -215,7 +161,7 @@ VISIBILITY_HIDDEN size_t LogMsgAppendStringArray(std::vector<std::string*>& sa)
     toLeEndian(&(s[i]), sizeof(STRLEN_TYPE));
     if (sa[i] != NULL) {
       len = sa[i]->size();
-      lm_check_buf(lmb, len, pos, s, head);
+      checkBuf(len, pos, s, head);
       memcpy(pos, sa[i]->c_str(), len);
       pos[len] = 0;
       pos += (len + 1);
@@ -223,24 +169,24 @@ VISIBILITY_HIDDEN size_t LogMsgAppendStringArray(std::vector<std::string*>& sa)
   }
   s[i] = pos - head;
   toLeEndian(&(s[i]), sizeof(STRLEN_TYPE));
-  lmb->bufPos = pos - lmb->buf;
+  bufPos = pos - buf;
   return offset;
 }
-VISIBILITY_HIDDEN size_t LogMsgAppendStringArray(const char** sa, size_t size)
+size_t LogMsgBuf::appendStringArray(const char** sa, size_t size)
 {
-  size_t offset = lmb->bufPos - LogMsgHeadSize;
-  *(DT_TYPE*)(lmb->buf + lmb->bufPos) = (DT_TYPE)(DT_STRING | DC_ARRAY);
-  lmb->bufPos += sizeof(DT_TYPE);
-  *(COUNT_TYPE*)(lmb->buf + lmb->bufPos) = (COUNT_TYPE)(size);
-  toLeEndian(lmb->buf + lmb->bufPos, sizeof(COUNT_TYPE));
+  size_t offset = bufPos - LogMsgHeadSize;
+  *(DT_TYPE*)(buf + bufPos) = (DT_TYPE)(DT_STRING | DC_ARRAY);
+  bufPos += sizeof(DT_TYPE);
+  *(COUNT_TYPE*)(buf + bufPos) = (COUNT_TYPE)(size);
+  toLeEndian(buf + bufPos, sizeof(COUNT_TYPE));
   if ((COUNT_TYPE)(size) == 0) {
-    lmb->bufPos += sizeof(COUNT_TYPE);
+    bufPos += sizeof(COUNT_TYPE);
     return offset;
   }
-  lmb->bufPos += sizeof(COUNT_TYPE);
+  bufPos += sizeof(COUNT_TYPE);
   STRLEN_TYPE len;
   COUNT_TYPE i = 0;
-  char *pos = lmb->buf + lmb->bufPos, *head;
+  char *pos = buf + bufPos, *head;
   STRLEN_TYPE* s = (STRLEN_TYPE*)pos;
   pos += sizeof(STRLEN_TYPE) * (size + 1);
   head = pos;
@@ -249,104 +195,104 @@ VISIBILITY_HIDDEN size_t LogMsgAppendStringArray(const char** sa, size_t size)
     toLeEndian(&(s[i]), sizeof(STRLEN_TYPE));
     if (sa[i] != NULL) {
       len = strlen(sa[i]) + 1;
-      lm_check_buf(lmb, len, pos, s, head);
+      checkBuf(len, pos, s, head);
       memcpy(pos, sa[i], len);
       pos += len;
     }
   }
   s[i] = pos - head;
   toLeEndian(&(s[i]), sizeof(STRLEN_TYPE));
-  lmb->bufPos = pos - lmb->buf;
+  bufPos = pos - buf;
   return offset;
 }
-VISIBILITY_HIDDEN size_t LogMsgAppendDataArray(std::vector<long>& sa)
+size_t LogMsgBuf::appendDataArray(std::vector<long>& sa)
 {
-  size_t offset = lmb->bufPos - LogMsgHeadSize;
-  *(DT_TYPE*)(lmb->buf + lmb->bufPos) = (DT_TYPE)(DT_INT64 | DC_ARRAY);
-  lmb->bufPos += sizeof(DT_TYPE);
-  *(COUNT_TYPE*)(lmb->buf + lmb->bufPos) = (COUNT_TYPE)(sa.size());
-  toLeEndian(lmb->buf + lmb->bufPos, sizeof(COUNT_TYPE));
+  size_t offset = bufPos - LogMsgHeadSize;
+  *(DT_TYPE*)(buf + bufPos) = (DT_TYPE)(DT_INT64 | DC_ARRAY);
+  bufPos += sizeof(DT_TYPE);
+  *(COUNT_TYPE*)(buf + bufPos) = (COUNT_TYPE)(sa.size());
+  toLeEndian(buf + bufPos, sizeof(COUNT_TYPE));
   if ((COUNT_TYPE)(sa.size()) == 0) {
-    lmb->bufPos += sizeof(COUNT_TYPE);
+    bufPos += sizeof(COUNT_TYPE);
     return offset;
   }
-  lmb->bufPos += sizeof(COUNT_TYPE);
+  bufPos += sizeof(COUNT_TYPE);
   COUNT_TYPE i = 0, j = sa.size();
-  char* pos = lmb->buf + lmb->bufPos;
+  char* pos = buf + bufPos;
   pos += sizeof(STRLEN_TYPE) * i;
   for (i = 0; i < j; ++i) {
     *(long*)pos = sa[i];
     toLeEndian(pos, sizeof(long));
     pos += sizeof(long);
   }
-  lmb->bufPos = pos - lmb->buf;
+  bufPos = pos - buf;
   return offset;
 }
 
-VISIBILITY_HIDDEN size_t LogMsgAppendDataArray(uint8_t* sa, size_t size)
+size_t LogMsgBuf::appendDataArray(uint8_t* sa, size_t size)
 {
-  size_t offset = lmb->bufPos - LogMsgHeadSize;
-  *(DT_TYPE*)(lmb->buf + lmb->bufPos) = (DT_TYPE)(DT_UINT8 | DC_ARRAY);
-  lmb->bufPos += sizeof(DT_TYPE);
-  *(COUNT_TYPE*)(lmb->buf + lmb->bufPos) = (COUNT_TYPE)(size);
-  toLeEndian(lmb->buf + lmb->bufPos, sizeof(COUNT_TYPE));
+  size_t offset = bufPos - LogMsgHeadSize;
+  *(DT_TYPE*)(buf + bufPos) = (DT_TYPE)(DT_UINT8 | DC_ARRAY);
+  bufPos += sizeof(DT_TYPE);
+  *(COUNT_TYPE*)(buf + bufPos) = (COUNT_TYPE)(size);
+  toLeEndian(buf + bufPos, sizeof(COUNT_TYPE));
   if ((COUNT_TYPE)(size) == 0 || sa == NULL) {
-    lmb->bufPos += sizeof(COUNT_TYPE);
+    bufPos += sizeof(COUNT_TYPE);
     return offset;
   }
-  lmb->bufPos += sizeof(COUNT_TYPE);
-  memcpy(lmb->buf + lmb->bufPos, sa, size);
-  lmb->bufPos += size;
+  bufPos += sizeof(COUNT_TYPE);
+  memcpy(buf + bufPos, sa, size);
+  bufPos += size;
   return offset;
 }
-VISIBILITY_HIDDEN void LogMsgSetHead(size_t size)
+void LogMsgBuf::setHead(size_t size)
 {
-  lmb->bufPos = size + LogMsgHeadSize + sizeof(DT_TYPE) + sizeof(COUNT_TYPE);
-  if (lmb->buf != lmb->defaultBuf) {
-    if (lmb->avg_size > DefaultLogMsgBufSize) {
-      if (lmb->avg_size < ((lmb->bufSize + DefaultLogMsgBufSize) >> 1)) {
-        delete[] lmb->buf;
-        lmb->buf = new char[lmb->bufSize = (lmb->bufSize + DefaultLogMsgBufSize) >> 1];
+  bufPos = size + LogMsgHeadSize + sizeof(DT_TYPE) + sizeof(COUNT_TYPE);
+  if (buf != defaultBuf) {
+    if (avg_size > DefaultLogMsgBufSize) {
+      if (avg_size < ((bufSize + DefaultLogMsgBufSize) >> 1)) {
+        delete[] buf;
+        buf = new char[bufSize = (bufSize + DefaultLogMsgBufSize) >> 1];
       }
     } else {
-      delete[] lmb->buf;
-      lmb->buf = lmb->defaultBuf;
-      lmb->bufSize = DefaultLogMsgBufSize;
+      delete[] buf;
+      buf = defaultBuf;
+      bufSize = DefaultLogMsgBufSize;
     }
   }
 }
-VISIBILITY_HIDDEN void LogMsgCopyHead(const char* head, size_t size)
+void LogMsgBuf::copyHead(const char* head, size_t size)
 {
-  ((struct MsgHeader*)lmb->buf)->m_msgType = MT_VAR;
-  toLeEndian(&(((struct MsgHeader*)lmb->buf)->m_msgType), sizeof(uint16_t));
-  ((struct MsgHeader*)lmb->buf)->m_version = 1;
-  toLeEndian(&(((struct MsgHeader*)lmb->buf)->m_version), sizeof(uint16_t));
-  ((struct MsgHeader*)lmb->buf)->m_size = lmb->bufPos - (sizeof(struct MsgHeader));
-  toLeEndian(&(((struct MsgHeader*)lmb->buf)->m_size), sizeof(uint32_t));
+  ((struct MsgHeader*)buf)->m_msgType = MT_VAR;
+  toLeEndian(&(((struct MsgHeader*)buf)->m_msgType), sizeof(uint16_t));
+  ((struct MsgHeader*)buf)->m_version = 1;
+  toLeEndian(&(((struct MsgHeader*)buf)->m_version), sizeof(uint16_t));
+  ((struct MsgHeader*)buf)->m_size = bufPos - (sizeof(struct MsgHeader));
+  toLeEndian(&(((struct MsgHeader*)buf)->m_size), sizeof(uint32_t));
 
-  *(COUNT_TYPE*)(lmb->buf + sizeof(struct MsgHeader)) = 0;
-  toLeEndian(lmb->buf + sizeof(struct MsgHeader), sizeof(COUNT_TYPE));
-  *(lmb->buf + LogMsgHeadSize) = (DT_TYPE)(DT_UINT8 | DC_ARRAY);
-  toLeEndian(lmb->buf + LogMsgHeadSize, sizeof(DT_TYPE));
-  *(COUNT_TYPE*)(lmb->buf + LogMsgHeadSize + sizeof(DT_TYPE)) = size;
-  toLeEndian(lmb->buf + LogMsgHeadSize + sizeof(DT_TYPE), sizeof(COUNT_TYPE));
-  memcpy(lmb->buf + LogMsgHeadSize + sizeof(DT_TYPE) + sizeof(COUNT_TYPE), head, size);
+  *(COUNT_TYPE*)(buf + sizeof(struct MsgHeader)) = 0;
+  toLeEndian(buf + sizeof(struct MsgHeader), sizeof(COUNT_TYPE));
+  *(buf + LogMsgHeadSize) = (DT_TYPE)(DT_UINT8 | DC_ARRAY);
+  toLeEndian(buf + LogMsgHeadSize, sizeof(DT_TYPE));
+  *(COUNT_TYPE*)(buf + LogMsgHeadSize + sizeof(DT_TYPE)) = size;
+  toLeEndian(buf + LogMsgHeadSize + sizeof(DT_TYPE), sizeof(COUNT_TYPE));
+  memcpy(buf + LogMsgHeadSize + sizeof(DT_TYPE) + sizeof(COUNT_TYPE), head, size);
 }
 
-VISIBILITY_HIDDEN void LogMsgFroceSetHeadSize(size_t size)
+void LogMsgBuf::froceSetHeadSize(size_t size)
 {
-  *(COUNT_TYPE*)(lmb->buf + LogMsgHeadSize + sizeof(DT_TYPE)) = size;
-  toLeEndian(lmb->buf + LogMsgHeadSize + sizeof(DT_TYPE), sizeof(COUNT_TYPE));
+  *(COUNT_TYPE*)(buf + LogMsgHeadSize + sizeof(DT_TYPE)) = size;
+  toLeEndian(buf + LogMsgHeadSize + sizeof(DT_TYPE), sizeof(COUNT_TYPE));
 }
 
-VISIBILITY_HIDDEN const char* LogMsgGetString(size_t* size)
+const char* LogMsgBuf::getString(size_t* size)
 {
-  *size = lmb->bufPos;
-  if (lmb->buf != lmb->defaultBuf && lmb->bufPos > DefaultLogMsgBufSize)
-    lmb->avg_size = ((((long)lmb->avg_size >> 1) + (long)lmb->bufPos) >> 1) + (lmb->bufPos >> 2);
+  *size = bufPos;
+  if (buf != defaultBuf && bufPos > DefaultLogMsgBufSize)
+    avg_size = ((((long)avg_size >> 1) + (long)bufPos) >> 1) + (bufPos >> 2);
   else
-    lmb->avg_size = (((long)lmb->avg_size + (long)lmb->bufPos) >> 1);
-  return lmb->buf;
+    avg_size = (((long)avg_size + (long)bufPos) >> 1);
+  return buf;
 }
 
 }  // namespace logmessage
diff --git a/src/LogRecord.cpp b/src/LogRecord.cpp
index 644508dac767e77184cb8545fd4ab8d2f36962c2..7d5a86526712bd516b2181c017a1ab7c86c741c0 100644
--- a/src/LogRecord.cpp
+++ b/src/LogRecord.cpp
@@ -140,7 +140,7 @@ struct LogRecInfo {
   string m_instance;
   string m_encoding;
   string m_ob_trace_info;
-  bool useDMB;
+  bool   useLMB; 
   bool m_reservedMemory;
   LogRecInfo(time_t timestamp, ITableMeta* tblMeta)
       : m_creatingMode(true),
@@ -152,7 +152,7 @@ struct LogRecInfo {
         m_tblMeta(tblMeta),
         m_dbMeta(NULL),
         m_expiredMetaDataCollections(NULL),
-        useDMB(false),
+        useLMB(false),
         m_reservedMemory(false)
   {
     m_posInfo = new PosOfLogMsg_vc;
@@ -187,7 +187,7 @@ struct LogRecInfo {
         m_tblMeta(NULL),
         m_dbMeta(NULL),
         m_expiredMetaDataCollections(NULL),
-        useDMB(false),
+        useLMB(false),
         m_reservedMemory(false)
   {
     m_lrDataArea = new MsgVarArea(false);
@@ -201,7 +201,7 @@ struct LogRecInfo {
     m_filter_max_count = FILTER_SIZE;
   }
 
-  LogRecInfo(bool creating, bool useDMB = false)
+  LogRecInfo(bool creating, bool useLMB = false)
       : m_creatingMode(creating),
         m_parsedOK(false),
         m_tailParseOK(false),
@@ -224,9 +224,9 @@ struct LogRecInfo {
       m_posInfo->m_id = LOGREC_INVALID_ID;
       m_posInfo->m_srcType = SRC_MYSQL;
       m_posInfo->m_srcCategory = SRC_FULL_RECORDED;
-      this->useDMB = useDMB;
+      this->useLMB = useLMB;
     } else {
-      this->useDMB = false;
+      this->useLMB= false;
       m_lrDataArea = new MsgVarArea(false);
     }
     m_reservedMemory = false;
@@ -259,7 +259,7 @@ struct LogRecInfo {
   void clear()
   {
     if (m_creatingMode) {
-      if (!useDMB) {
+      if (!useLMB) {
         m_lrDataArea->clear();
         m_lrDataArea->appendArray((uint8_t*)m_posInfo, sizeof(PosOfLogMsg_vc));
       } else {
@@ -845,7 +845,7 @@ struct LogRecInfo {
 
   void setInstance(const char* instance)
   {
-    if (useDMB) {
+    if (useLMB) {
       SET_OR_CLEAR_STRING(m_instance, instance);
     } else
       ((PosOfLogMsg_vc*)m_posInfo)->m_posOfInstance = m_lrDataArea->appendString(instance);
@@ -853,7 +853,7 @@ struct LogRecInfo {
 
   const char* instance()
   {
-    if (useDMB)
+    if (useLMB)
       return m_instance.c_str();
     size_t offset = ((PosOfLogMsg_vc*)m_posInfo)->m_posOfInstance;
     return m_lrDataArea->getString(offset);
@@ -861,7 +861,7 @@ struct LogRecInfo {
 
   void setDbname(const char* dbname)
   {
-    if (useDMB) {
+    if (useLMB) {
       SET_OR_CLEAR_STRING(m_dbName, dbname);
     } else {
       // when m_creatingMode is false,before call function parse,m_posInfo maybe null
@@ -873,7 +873,7 @@ struct LogRecInfo {
 
   const char* dbname() const
   {
-    if (useDMB)
+    if (useLMB)
       return m_dbName.c_str();
     size_t offset = ((PosOfLogMsg_vc*)m_posInfo)->m_posOfDbName;
     return m_lrDataArea->getString(offset);
@@ -881,7 +881,7 @@ struct LogRecInfo {
 
   void setTbname(const char* tbname)
   {
-    if (useDMB) {
+    if (useLMB) {
       SET_OR_CLEAR_STRING(m_tbName, tbname);
     } else {
       if (m_posInfo != NULL) {
@@ -892,7 +892,7 @@ struct LogRecInfo {
 
   const char* tbname() const
   {
-    if (useDMB)
+    if (useLMB)
       return m_tbName.c_str();
     size_t offset = ((PosOfLogMsg_vc*)m_posInfo)->m_posOfTbName;
     return m_lrDataArea->getString(offset);
@@ -978,7 +978,7 @@ struct LogRecInfo {
 
   void setRecordEncoding(const char* encoding)
   {
-    if (useDMB)
+    if (useLMB)
       SET_OR_CLEAR_STRING(m_encoding, encoding);
     else
       ((PosOfLogMsg_vc*)m_posInfo)->m_encoding = m_lrDataArea->appendString(encoding);
@@ -1001,7 +1001,7 @@ struct LogRecInfo {
 
   void setObTraceInfo(const char* ob_trace_info)
   {
-    if (useDMB) {
+    if (useLMB) {
       SET_OR_CLEAR_STRING(m_ob_trace_info, ob_trace_info);
     } else {
       ((PosOfLogMsg_vc*)m_posInfo)->m_posOfObTraceInfo = m_lrDataArea->appendString(ob_trace_info);
@@ -1011,7 +1011,7 @@ struct LogRecInfo {
   const char* obTraceInfo()
   {
     if (m_creatingMode || m_parsedOK) {
-      if (useDMB) {
+      if (useLMB) {
         return m_ob_trace_info.c_str();
       } else {
         if (GET_LOGREC_SUB_VERSION(m_posInfo->m_id) >= LOGREC_SUB_VERSION) {
@@ -1251,16 +1251,17 @@ struct LogRecInfo {
    *
    * @return the pointer to the serialized string, NULL is returned if failed
    */
-  const char* toString(size_t* size, bool reserveMemory = false)
+  const char* toString(size_t* size, LogMsgBuf* lmb = NULL, bool reserveMemory = false)
   {
     if (!m_creatingMode) {
       return getSerializedString(size);
     }
+
     /* Always use the latest version to do the serialization */
     int colCount = 0;
     uint8_t op = m_posInfo->m_op;
-    if (useDMB)
-      LogMsgSetHead(sizeof(PosOfLogMsg_vc));
+    if (useLMB)
+      lmb->setHead(sizeof(PosOfLogMsg_vc));
     switch (op) {
       case EINSERT:
       case EDELETE:
@@ -1282,19 +1283,19 @@ struct LogRecInfo {
          */
         m_tblMeta->trySerializeMetaDataAsMsgArea(m_extra_infos);
 
-        if (useDMB) {
-          ((PosOfLogMsg_vc*)m_posInfo)->m_posOfColNames = LogMsgAppendBuf(m_tblMeta->getNameData());
-          ((PosOfLogMsg_vc*)m_posInfo)->m_posOfColEncoding = LogMsgAppendBuf(m_tblMeta->getEncodingData());
-          ((PosOfLogMsg_vc*)m_posInfo)->m_posOfPkKeys = LogMsgAppendBuf(m_tblMeta->getPkData());
-          ((PosOfLogMsg_vc*)m_posInfo)->m_posOfUkKeys = LogMsgAppendBuf(m_tblMeta->getUkData());
-          ((PosOfLogMsg_vc*)m_posInfo)->m_posOfPkVal = LogMsgAppendBuf(m_tblMeta->getkeyData());
-          ((PosOfLogMsg_vc*)m_posInfo)->m_posOfColTypes = LogMsgAppendBuf(m_tblMeta->getcolTypeData());
-          ((PosOfLogMsg_vc*)m_posInfo)->m_posOfColFlag = LogMsgAppendBuf(m_tblMeta->getColumnFlagData());
-          ((PosOfLogMsg_vc*)m_posInfo)->m_posOfColNotNull = LogMsgAppendBuf(m_tblMeta->getNotNullData());
-          ((PosOfLogMsg_vc*)m_posInfo)->m_posOfColSigned = LogMsgAppendBuf(m_tblMeta->getSignedData());
-          ((PosOfLogMsg_vc*)m_posInfo)->m_posOfColDecimals = LogMsgAppendBuf(m_tblMeta->getDecimalsData());
+        if (useLMB) {
+          ((PosOfLogMsg_vc*)m_posInfo)->m_posOfColNames = lmb->appendBuf(m_tblMeta->getNameData());
+          ((PosOfLogMsg_vc*)m_posInfo)->m_posOfColEncoding = lmb->appendBuf(m_tblMeta->getEncodingData());
+          ((PosOfLogMsg_vc*)m_posInfo)->m_posOfPkKeys = lmb->appendBuf(m_tblMeta->getPkData());
+          ((PosOfLogMsg_vc*)m_posInfo)->m_posOfUkKeys = lmb->appendBuf(m_tblMeta->getUkData());
+          ((PosOfLogMsg_vc*)m_posInfo)->m_posOfPkVal = lmb->appendBuf(m_tblMeta->getkeyData());
+          ((PosOfLogMsg_vc*)m_posInfo)->m_posOfColTypes = lmb->appendBuf(m_tblMeta->getcolTypeData());
+          ((PosOfLogMsg_vc*)m_posInfo)->m_posOfColFlag = lmb->appendBuf(m_tblMeta->getColumnFlagData());
+          ((PosOfLogMsg_vc*)m_posInfo)->m_posOfColNotNull = lmb->appendBuf(m_tblMeta->getNotNullData());
+          ((PosOfLogMsg_vc*)m_posInfo)->m_posOfColSigned = lmb->appendBuf(m_tblMeta->getSignedData());
+          ((PosOfLogMsg_vc*)m_posInfo)->m_posOfColDecimals = lmb->appendBuf(m_tblMeta->getDecimalsData());
           if (!m_timemarks.empty())
-            ((PosOfLogMsg_vc*)m_posInfo)->m_posOfTimemark = LogMsgAppendDataArray(m_timemarks);
+            ((PosOfLogMsg_vc*)m_posInfo)->m_posOfTimemark = lmb->appendDataArray(m_timemarks);
         } else {
           setColNames(m_tblMeta->getNameData());
           setColEncoding(m_tblMeta->getEncodingData());
@@ -1316,29 +1317,29 @@ struct LogRecInfo {
         break;
       }
       case EDDL:
-        if ((int)((PosOfLogMsg_vc*)m_posInfo)->m_encoding == -1 && !(useDMB && !m_encoding.empty()))
+        if ((int)((PosOfLogMsg_vc*)m_posInfo)->m_encoding == -1 && !(useLMB && !m_encoding.empty()))
           setRecordEncoding("US-ASCII");
         colCount = m_new_count > 0 ? m_new_count : m_new_cols.size();
-        if (!useDMB) {
+        if (!useLMB) {
 
           setColNames(ddlName, colCount);
           setColTypes(ddlType, colCount);
           /* Not know the actual encoding, dangerous */
         } else {
-          ((PosOfLogMsg_vc*)m_posInfo)->m_posOfColNames = LogMsgAppendStringArray(ddlName, colCount);
-          ((PosOfLogMsg_vc*)m_posInfo)->m_posOfColTypes = LogMsgAppendDataArray(ddlType, colCount);
+          ((PosOfLogMsg_vc*)m_posInfo)->m_posOfColNames = lmb->appendStringArray(ddlName, colCount);
+          ((PosOfLogMsg_vc*)m_posInfo)->m_posOfColTypes = lmb->appendDataArray(ddlType, colCount);
         }
         break;
       case EDML:
-        if ((int)((PosOfLogMsg_vc*)m_posInfo)->m_encoding == -1 && !(useDMB && !m_encoding.empty()))
+        if ((int)((PosOfLogMsg_vc*)m_posInfo)->m_encoding == -1 && !(useLMB && !m_encoding.empty()))
           setRecordEncoding("US-ASCII");
-        if (!useDMB) {
+        if (!useLMB) {
           setColNames(&dmlName, 1);
           setColTypes(dmlType, 1);
           /* Not know the actual encoding, dangerous */
         } else {
-          ((PosOfLogMsg_vc*)m_posInfo)->m_posOfColNames = LogMsgAppendStringArray(&dmlName, 1);
-          ((PosOfLogMsg_vc*)m_posInfo)->m_posOfColTypes = LogMsgAppendDataArray(dmlType, 1);
+          ((PosOfLogMsg_vc*)m_posInfo)->m_posOfColNames = lmb->appendStringArray(&dmlName, 1);
+          ((PosOfLogMsg_vc*)m_posInfo)->m_posOfColTypes = lmb->appendDataArray(dmlType, 1);
         }
         break;
       default:
@@ -1357,7 +1358,7 @@ struct LogRecInfo {
      * For insert type, no old values, in a similar way, delete-type
      * record has no new values. Updating record has both values.
      */
-    if (!useDMB) {
+    if (!useLMB) {
       if (m_old_count == 0 && m_new_count == 0 && (m_new_cols.size() > 0 || m_old_cols.size() > 0)) {
         setColValuesBeforeImage();
         setColValuesAfterImage();
@@ -1402,48 +1403,48 @@ struct LogRecInfo {
     } else {
       if ((int)((PosOfLogMsg_vc*)m_posInfo)->m_encoding == -1) {
         if (m_encoding.empty())
-          ((PosOfLogMsg_vc*)m_posInfo)->m_encoding = LogMsgAppendString(m_tblMeta->getEncoding());
+          ((PosOfLogMsg_vc*)m_posInfo)->m_encoding = lmb->appendString(m_tblMeta->getEncoding());
         else
-          ((PosOfLogMsg_vc*)m_posInfo)->m_encoding = LogMsgAppendString(m_encoding);
+          ((PosOfLogMsg_vc*)m_posInfo)->m_encoding = lmb->appendString(m_encoding);
       }
       if (m_old_count == 0 && m_new_count == 0 && (m_new_cols.size() > 0 || m_old_cols.size() > 0)) {
-        ((PosOfLogMsg_vc*)m_posInfo)->m_posOfOldCols = LogMsgAppendStringArray(m_old_cols);
-        ((PosOfLogMsg_vc*)m_posInfo)->m_posOfNewCols = LogMsgAppendStringArray(m_new_cols);
+        ((PosOfLogMsg_vc*)m_posInfo)->m_posOfOldCols = lmb->appendStringArray(m_old_cols);
+        ((PosOfLogMsg_vc*)m_posInfo)->m_posOfNewCols = lmb->appendStringArray(m_new_cols);
       } else {
-        ((PosOfLogMsg_vc*)m_posInfo)->m_posOfOldCols = LogMsgAppendBuf(m_old_clum, m_old_count);
-        ((PosOfLogMsg_vc*)m_posInfo)->m_posOfNewCols = LogMsgAppendBuf(m_new_clum, m_new_count);
+        ((PosOfLogMsg_vc*)m_posInfo)->m_posOfOldCols = lmb->appendBuf(m_old_clum, m_old_count);
+        ((PosOfLogMsg_vc*)m_posInfo)->m_posOfNewCols = lmb->appendBuf(m_new_clum, m_new_count);
       }
       if (m_dbName.size())
-        ((PosOfLogMsg_vc*)m_posInfo)->m_posOfDbName = LogMsgAppendString(m_dbName.c_str(), m_dbName.size());
+        ((PosOfLogMsg_vc*)m_posInfo)->m_posOfDbName = lmb->appendString(m_dbName.c_str(), m_dbName.size());
       if (m_tbName.size())
-        ((PosOfLogMsg_vc*)m_posInfo)->m_posOfTbName = LogMsgAppendString(m_tbName.c_str(), m_tbName.size());
-      ((PosOfLogMsg_vc*)m_posInfo)->m_posOfInstance = LogMsgAppendString(m_instance.c_str(), m_instance.size());
-      ((PosOfLogMsg_vc*)m_posInfo)->m_posOfFilterRuleVal = LogMsgAppendBuf(m_filter_value, m_filter_count);
+        ((PosOfLogMsg_vc*)m_posInfo)->m_posOfTbName = lmb->appendString(m_tbName.c_str(), m_tbName.size());
+      ((PosOfLogMsg_vc*)m_posInfo)->m_posOfInstance = lmb->appendString(m_instance.c_str(), m_instance.size());
+      ((PosOfLogMsg_vc*)m_posInfo)->m_posOfFilterRuleVal = lmb->appendBuf(m_filter_value, m_filter_count);
       if (m_endInfo != NULL) {
         unsigned char* endInfoToLe = new unsigned char[sizeof(EndOfLogMsg)];
         memcpy(endInfoToLe, (unsigned char*)m_endInfo, sizeof(EndOfLogMsg));
         exchangeEndInfoToLe(endInfoToLe, sizeof(EndOfLogMsg));
         ((PosOfLogMsg_vc*)m_posInfo)->m_posOfEndInfo =
-            LogMsgAppendDataArray((unsigned char*)endInfoToLe, sizeof(EndOfLogMsg));
+            lmb->appendDataArray((unsigned char*)endInfoToLe, sizeof(EndOfLogMsg));
         delete[] endInfoToLe;
       }
 
       char* posInfoToLe = new char[sizeof(PosOfLogMsg_vc)];
       memcpy(posInfoToLe, (const char*)m_posInfo, sizeof(PosOfLogMsg_vc));
       exchangePosInfoToLe(posInfoToLe, sizeof(PosOfLogMsg_vc));
-      LogMsgCopyHead(posInfoToLe, sizeof(PosOfLogMsg_vc));
-      LogMsgFroceSetHeadSize(sizeof(PosOfLogMsg_v3));
+      lmb->copyHead(posInfoToLe, sizeof(PosOfLogMsg_vc));
+      lmb->froceSetHeadSize(sizeof(PosOfLogMsg_v3));
       delete[] posInfoToLe;
 
-      const char* msg = LogMsgGetString(size);
+      const char* msg = lmb->getString(size);
       if (LOGREC_CRC) {
-        EndOfLogMsg* tail = (EndOfLogMsg*)LogMsgGetValueByOffset(((PosOfLogMsg_vc*)m_posInfo)->m_posOfEndInfo);
+        EndOfLogMsg* tail = (EndOfLogMsg*)(lmb->getValueByOffset(((PosOfLogMsg_vc*)m_posInfo)->m_posOfEndInfo));
         tail->m_crc = toLeEndianByType((uint32_t)crc32_fast(msg, (char*)tail - msg + offsetof(EndOfLogMsg, m_crc)));
       }
       /* Serialize the header */
       if (reserveMemory) {
         m_reservedMemory = true;
-        /* Only when useDMB is true, the memory of dmb should be copied */
+        /* Only when useLMB is true, the memory of dmb should be copied */
         if (m_lrDataArea->copy(msg, *size) != 0) {
           std::cout << "LOGMESSAGE: toString return 3" << std::endl;
           return NULL;
@@ -1478,9 +1479,9 @@ LogRecordImpl::LogRecordImpl(const void* ptr, size_t size)
   m_userData = NULL;
 }
 
-LogRecordImpl::LogRecordImpl(bool creating, bool useDMB)
+LogRecordImpl::LogRecordImpl(bool creating, bool useLMB)
 {
-  m_lr = new LogRecInfo(creating, useDMB);
+  m_lr = new LogRecInfo(creating, useLMB);
   m_timemarked = false;
   m_userData = NULL;
 }
@@ -1652,9 +1653,9 @@ const char* LogRecordImpl::getSerializedString(size_t* size)
   return m_lr->getSerializedString(size);
 }
 
-const char* LogRecordImpl::toString(size_t* size, bool reserveMemory)
+const char* LogRecordImpl::toString(size_t* size, LogMsgBuf* lmb, bool reserveMemory)
 {
-  return m_lr->toString(size, reserveMemory);
+  return m_lr->toString(size, lmb, reserveMemory);
 }
 
 const char* LogRecordImpl::getFormatedString(size_t* size)
diff --git a/unittest/faTest.cpp b/unittest/faTest.cpp
index 6bb3209d46aee720af9b6650ed9c15624318e8aa..5036fbd3919cc5887ee9ea962e5459045fc81fdc 100644
--- a/unittest/faTest.cpp
+++ b/unittest/faTest.cpp
@@ -19,7 +19,7 @@ TEST(LogMsgFactory, LogMsgFactoryAPI)
   IMetaDataCollections* meta = LogMsgFactory::createMetaDataCollections();
   ASSERT_NE((void*)NULL, (void*)meta);
 
-  ILogRecord* record = LogMsgFactory::createLogRecord();
+  ILogRecord* record = LogMsgFactory::createLogRecord("LogRecordImpl",true);
   ASSERT_NE((void*)NULL, (void*)record);
 
   LogMsgFactory::destroy(colMeta);
diff --git a/unittest/lrTest.cpp b/unittest/lrTest.cpp
index adf1283444eed74aa55f9de88e4ddce3e1426a08..4f94e33cb93e3718163cdb35faefa16c2ea8a1be 100644
--- a/unittest/lrTest.cpp
+++ b/unittest/lrTest.cpp
@@ -110,14 +110,14 @@ typedef struct _TestThreadInfo {
 
 void* create(void* argv)
 {
-  LogMsgLocalInit();
+  LogMsgBuf* lmb = new LogMsgBuf();
   TestThreadInfo* info = (TestThreadInfo*)argv;
   long matched = 0;
   long mismatched = 0;
   while (*(info->quit) == false) {
     ILogRecord* sample = createLogRecord();
     size_t pre_toString_size;
-    sample->toString(&pre_toString_size, true);
+    sample->toString(&pre_toString_size, lmb,true);
 
     size_t sample_msg_size;
     const char* sample_msg_content = sample->getFormatedString(&sample_msg_size);
@@ -137,7 +137,7 @@ void* create(void* argv)
     LogMsgFactory::destroy(sample);
   }
   std::cout << "matched " << matched << ", mismatched " << mismatched << std::endl;
-  LogMsgLocalDestroy();
+  delete lmb;
   return NULL;
 }
 
@@ -147,10 +147,10 @@ TEST(LogRecordImpl, ConcurrencyToString)
 {
   bool quit = false;
   /* Create one sample for copmare */
-  LogMsgInit();
+  LogMsgBuf* lmb = new LogMsgBuf();
   ILogRecord* sample = createLogRecord();
   size_t sample_msg_size;
-  const char* sample_msg_content = sample->toString(&sample_msg_size);
+  const char* sample_msg_content = sample->toString(&sample_msg_size,lmb);
 
   /* ToString in multi-pthreads */
 
@@ -172,7 +172,7 @@ TEST(LogRecordImpl, ConcurrencyToString)
   for (int i = 0; i < Concurrency; i++)
     pthread_join(*(testThreads + i), NULL);
   delete[] testThreads;
-  LogMsgDestroy();
+  delete lmb;
 }
 /*
 TEST(LogRecordImpl, ParseAndGet) {