diff --git a/source/dnode/mgmt/mgmt_vnode/src/vmHandle.c b/source/dnode/mgmt/mgmt_vnode/src/vmHandle.c
index 751edd6f98807a5d61f58479404b8648b9e5adb8..b8917e6dba604c5c54a99e439b55e9e30a9b6fd8 100644
--- a/source/dnode/mgmt/mgmt_vnode/src/vmHandle.c
+++ b/source/dnode/mgmt/mgmt_vnode/src/vmHandle.c
@@ -86,9 +86,7 @@ static void vmGenerateVnodeCfg(SCreateVnodeReq *pCreate, SVnodeCfg *pCfg) {
 
   pCfg->vgId = pCreate->vgId;
   strcpy(pCfg->dbname, pCreate->db);
-  pCfg->wsize = pCreate->cacheBlockSize * 1024 * 1024;
-  pCfg->ssize = 1024;
-  pCfg->lsize = 1024 * 1024;
+  pCfg->szBuf = pCreate->cacheBlockSize * 1024 * 1024;
   pCfg->streamMode = pCreate->streamMode;
   pCfg->isWeak = true;
   pCfg->tsdbCfg.keep2 = pCreate->daysToKeep0;
diff --git a/source/dnode/vnode/CMakeLists.txt b/source/dnode/vnode/CMakeLists.txt
index 04a84d375a9a92816fb6c3191d52570418e2e2fb..5516797d998a2462ec89b345d93d197efc27ae5f 100644
--- a/source/dnode/vnode/CMakeLists.txt
+++ b/source/dnode/vnode/CMakeLists.txt
@@ -5,9 +5,9 @@ target_sources(
     PRIVATE
     # vnode
     "src/vnd/vnodeOpen.c"
-    "src/vnd/vnodeArenaMAImpl.c"
-    "src/vnd/vnodeBufferPool.c"
-    # "src/vnd/vnodeBufferPool2.c"
+    # "src/vnd/vnodeArenaMAImpl.c"
+    # "src/vnd/vnodeBufferPool.c"
+    "src/vnd/vnodeBufPool.c"
     "src/vnd/vnodeCfg.c"
     "src/vnd/vnodeCommit.c"
     "src/vnd/vnodeInt.c"
@@ -27,6 +27,7 @@ target_sources(
     # tsdb
     "src/tsdb/tsdbTDBImpl.c"
     "src/tsdb/tsdbCommit.c"
+    "src/tsdb/tsdbCommit2.c"
     "src/tsdb/tsdbCompact.c"
     "src/tsdb/tsdbFile.c"
     "src/tsdb/tsdbFS.c"
diff --git a/source/dnode/vnode/inc/vnode.h b/source/dnode/vnode/inc/vnode.h
index 1258d124bfd49e77220576dfdd2e1df771030815..c24261a909c8e80169a612b41f45219cfab426be 100644
--- a/source/dnode/vnode/inc/vnode.h
+++ b/source/dnode/vnode/inc/vnode.h
@@ -123,6 +123,7 @@ struct STsdbCfg {
   int8_t   precision;
   int8_t   update;
   int8_t   compression;
+  int8_t   slLevel;
   int32_t  days;
   int32_t  minRows;
   int32_t  maxRows;
@@ -139,10 +140,8 @@ struct SVnodeCfg {
   uint64_t dbId;
   int32_t  szPage;
   int32_t  szCache;
-  uint64_t wsize;
-  uint64_t ssize;
-  uint64_t lsize;
-  bool     isHeapAllocator;
+  uint64_t szBuf;
+  bool     isHeap;
   uint32_t ttl;
   uint32_t keep;
   int8_t   streamMode;
diff --git a/source/dnode/vnode/src/inc/tq.h b/source/dnode/vnode/src/inc/tq.h
index ed33473b1620102b1eacc1d7786f7a8f610f9b36..0cab00f47ad4ffb2911d9e2041222793c52db43e 100644
--- a/source/dnode/vnode/src/inc/tq.h
+++ b/source/dnode/vnode/src/inc/tq.h
@@ -250,7 +250,7 @@ int  tqInit();
 void tqCleanUp();
 
 // open in each vnode
-STQ* tqOpen(const char* path, SVnode* pVnode, SWal* pWal, SMeta* pMeta, SMemAllocatorFactory* allocFac);
+STQ* tqOpen(const char* path, SVnode* pVnode, SWal* pWal, SMeta* pMeta);
 void tqClose(STQ*);
 // required by vnode
 int tqPushMsg(STQ*, void* msg, int32_t msgLen, tmsg_t msgType, int64_t version);
diff --git a/source/dnode/vnode/src/inc/tsdb.h b/source/dnode/vnode/src/inc/tsdb.h
index ce9549af563106e38afa061ef781e452af47d97d..e899e820085e29cb26e1548791a11f94d617f502 100644
--- a/source/dnode/vnode/src/inc/tsdb.h
+++ b/source/dnode/vnode/src/inc/tsdb.h
@@ -30,21 +30,38 @@ extern "C" {
 #define tsdbTrace(...) do { if (tsdbDebugFlag & DEBUG_TRACE) { taosPrintLog("TSDB ", DEBUG_TRACE, tsdbDebugFlag, __VA_ARGS__); }} while(0)
 // clang-format on
 
+// tsdbMemTable ================
+typedef struct STbData       STbData;
+typedef struct STsdbMemTable STsdbMemTable;
+typedef struct SMergeInfo    SMergeInfo;
+typedef struct STable        STable;
+
+int  tsdbMemTableCreate(STsdb *pTsdb, STsdbMemTable **ppMemTable);
+void tsdbMemTableDestroy(STsdb *pTsdb, STsdbMemTable *pMemTable);
+int  tsdbMemTableInsert(STsdb *pTsdb, STsdbMemTable *pMemTable, SSubmitReq *pMsg, SSubmitRsp *pRsp);
+int  tsdbLoadDataFromCache(STable *pTable, SSkipListIterator *pIter, TSKEY maxKey, int maxRowsToRead, SDataCols *pCols,
+                           TKEY *filterKeys, int nFilterKeys, bool keepDup, SMergeInfo *pMergeInfo);
+
+// tsdbCommit ================
+int tsdbBegin(STsdb *pTsdb);
+
+#if 1
+
 typedef struct SSmaStat SSmaStat;
 typedef struct SSmaEnv  SSmaEnv;
 typedef struct SSmaEnvs SSmaEnvs;
 
-typedef struct STable {
+struct STable {
   uint64_t  tid;
   uint64_t  uid;
   STSchema *pSchema;
-} STable;
+};
 
 #define TABLE_TID(t) (t)->tid
 #define TABLE_UID(t) (t)->uid
 
-STsdb  *tsdbOpen(const char *path, SVnode *pVnode, const STsdbCfg *pTsdbCfg, SMemAllocatorFactory *pMAF);
-void    tsdbClose(STsdb *);
+int     tsdbOpen(SVnode *pVnode, STsdb **ppTsdb);
+int     tsdbClose(STsdb *pTsdb);
 int     tsdbInsertData(STsdb *pTsdb, SSubmitReq *pMsg, SSubmitRsp *pRsp);
 int     tsdbPrepareCommit(STsdb *pTsdb);
 int     tsdbCommit(STsdb *pTsdb);
@@ -110,25 +127,28 @@ typedef struct {
   TSKEY minKey;
 } SRtn;
 
-typedef struct STbData {
+struct STbData {
   tb_uid_t   uid;
   TSKEY      keyMin;
   TSKEY      keyMax;
+  int64_t    minVer;
+  int64_t    maxVer;
   int64_t    nrows;
   SSkipList *pData;
-} STbData;
+};
 
-typedef struct STsdbMemTable {
+struct STsdbMemTable {
+  SVBufPool *pPool;
   T_REF_DECLARE()
-  SRWLatch       latch;
-  TSKEY          keyMin;
-  TSKEY          keyMax;
-  uint64_t       nRow;
-  SMemAllocator *pMA;
-  // Container
+  SRWLatch   latch;
+  TSKEY      keyMin;
+  TSKEY      keyMax;
+  int64_t    minVer;
+  int64_t    maxVer;
+  int64_t    nRow;
   SSkipList *pSlIdx;  // SSkiplist<STbData>
   SHashObj  *pHashIdx;
-} STsdbMemTable;
+};
 
 typedef struct {
   uint32_t version;       // Commit version from 0 to increase
@@ -154,18 +174,17 @@ typedef struct {
 } STsdbFS;
 
 struct STsdb {
-  int32_t               vgId;
-  SVnode               *pVnode;
-  bool                  repoLocked;
-  TdThreadMutex         mutex;
-  char                 *path;
-  STsdbCfg              config;
-  STsdbMemTable        *mem;
-  STsdbMemTable        *imem;
-  SRtn                  rtn;
-  SMemAllocatorFactory *pmaf;
-  STsdbFS              *fs;
-  SSmaEnvs              smaEnvs;
+  char          *path;
+  SVnode        *pVnode;
+  int32_t        vgId;
+  bool           repoLocked;
+  TdThreadMutex  mutex;
+  STsdbCfg       config;
+  STsdbMemTable *mem;
+  STsdbMemTable *imem;
+  SRtn           rtn;
+  STsdbFS       *fs;
+  SSmaEnvs       smaEnvs;
 };
 
 #define REPO_ID(r)        ((r)->vgId)
@@ -187,7 +206,7 @@ static FORCE_INLINE STSchema *tsdbGetTableSchemaImpl(STable *pTable, bool lock,
 }
 
 // tsdbMemTable.h
-typedef struct {
+struct SMergeInfo {
   int   rowsInserted;
   int   rowsUpdated;
   int   rowsDeleteSucceed;
@@ -195,7 +214,7 @@ typedef struct {
   int   nOperations;
   TSKEY keyFirst;
   TSKEY keyLast;
-} SMergeInfo;
+};
 
 static void  *taosTMalloc(size_t size);
 static void  *taosTCalloc(size_t nmemb, size_t size);
@@ -204,12 +223,6 @@ static void  *taosTZfree(void *ptr);
 static size_t taosTSizeof(void *ptr);
 static void   taosTMemset(void *ptr, int c);
 
-STsdbMemTable *tsdbNewMemTable(STsdb *pTsdb);
-void           tsdbFreeMemTable(STsdb *pTsdb, STsdbMemTable *pMemTable);
-int            tsdbMemTableInsert(STsdb *pTsdb, STsdbMemTable *pMemTable, SSubmitReq *pMsg, SSubmitRsp *pRsp);
-int tsdbLoadDataFromCache(STable *pTable, SSkipListIterator *pIter, TSKEY maxKey, int maxRowsToRead, SDataCols *pCols,
-                          TKEY *filterKeys, int nFilterKeys, bool keepDup, SMergeInfo *pMergeInfo);
-
 static FORCE_INLINE STSRow *tsdbNextIterRow(SSkipListIterator *pIter) {
   if (pIter == NULL) return NULL;
 
@@ -988,6 +1001,8 @@ static FORCE_INLINE int32_t tsdbEncodeTSmaKey(int64_t groupId, TSKEY tsKey, void
   return len;
 }
 
+#endif
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/source/dnode/vnode/src/inc/vnd.h b/source/dnode/vnode/src/inc/vnd.h
index e0c158edb1bd5f33b8eda01254ec70888e05eb51..afbea8663fecebed65757f1c2a8d980f5e78cfff 100644
--- a/source/dnode/vnode/src/inc/vnd.h
+++ b/source/dnode/vnode/src/inc/vnd.h
@@ -40,22 +40,31 @@ int vnodeDecodeConfig(const SJson* pJson, void* pObj);
 // vnodeModule ====================
 int vnodeScheduleTask(int (*execute)(void*), void* arg);
 
-// vnodeQuery ====================
-int  vnodeQueryOpen(SVnode* pVnode);
-void vnodeQueryClose(SVnode* pVnode);
-int  vnodeGetTableMeta(SVnode* pVnode, SRpcMsg* pMsg);
-
-// vnodeCommit ====================
-int vnodeBegin(SVnode* pVnode);
-int vnodeSaveInfo(const char* dir, const SVnodeInfo* pCfg);
-int vnodeCommitInfo(const char* dir, const SVnodeInfo* pInfo);
-int vnodeLoadInfo(const char* dir, SVnodeInfo* pInfo);
-int vnodeSyncCommit(SVnode* pVnode);
-int vnodeAsyncCommit(SVnode* pVnode);
-
-#define vnodeShouldCommit vnodeBufPoolIsFull
-
+// vnodeBufPool ====================
 #if 1
+typedef struct SVBufPoolNode SVBufPoolNode;
+struct SVBufPoolNode {
+  SVBufPoolNode*  prev;
+  SVBufPoolNode** pnext;
+  int64_t         size;
+  uint8_t         data[];
+};
+
+struct SVBufPool {
+  SVBufPool*     next;
+  int64_t        nRef;
+  int64_t        size;
+  uint8_t*       ptr;
+  SVBufPoolNode* pTail;
+  SVBufPoolNode  node;
+};
+
+int   vnodeOpenBufPool(SVnode* pVnode, int64_t size);
+int   vnodeCloseBufPool(SVnode* pVnode);
+void  vnodeBufPoolReset(SVBufPool* pPool);
+void* vnodeBufPoolMalloc(SVBufPool* pPool, int size);
+void  vnodeBufPoolFree(SVBufPool* pPool, void* p);
+#else
 // SVBufPool
 int   vnodeOpenBufPool(SVnode* pVnode);
 void  vnodeCloseBufPool(SVnode* pVnode);
@@ -90,9 +99,21 @@ void            vmaReset(SVMemAllocator* pVMA);
 void*           vmaMalloc(SVMemAllocator* pVMA, uint64_t size);
 void            vmaFree(SVMemAllocator* pVMA, void* ptr);
 bool            vmaIsFull(SVMemAllocator* pVMA);
-
 #endif
 
+// vnodeQuery ====================
+int  vnodeQueryOpen(SVnode* pVnode);
+void vnodeQueryClose(SVnode* pVnode);
+int  vnodeGetTableMeta(SVnode* pVnode, SRpcMsg* pMsg);
+
+// vnodeCommit ====================
+int vnodeBegin(SVnode* pVnode);
+int vnodeSaveInfo(const char* dir, const SVnodeInfo* pCfg);
+int vnodeCommitInfo(const char* dir, const SVnodeInfo* pInfo);
+int vnodeLoadInfo(const char* dir, SVnodeInfo* pInfo);
+int vnodeSyncCommit(SVnode* pVnode);
+int vnodeAsyncCommit(SVnode* pVnode);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/source/dnode/vnode/src/inc/vnodeInt.h b/source/dnode/vnode/src/inc/vnodeInt.h
index a9904013240c911b8d17bfe8e8624f9ec0c8e22f..50e51b84c1e017d87b4fd12315a7f200479bc0d2 100644
--- a/source/dnode/vnode/src/inc/vnodeInt.h
+++ b/source/dnode/vnode/src/inc/vnodeInt.h
@@ -91,7 +91,10 @@ struct SVnode {
   SVState    state;
   STfs*      pTfs;
   SMsgCb     msgCb;
-  SVBufPool* pBufPool;
+  SVBufPool* pPool;
+  SVBufPool* inUse;
+  SVBufPool* onCommit;
+  SVBufPool* onRecycle;
   SMeta*     pMeta;
   STsdb*     pTsdb;
   SWal*      pWal;
diff --git a/source/dnode/vnode/src/meta/metaCommit.c b/source/dnode/vnode/src/meta/metaCommit.c
index 8e28b6ea7b4f2859c04aab0efdfabe61b7ec984f..10126ddd1db0cd4365fda6cc523fe60952856f52 100644
--- a/source/dnode/vnode/src/meta/metaCommit.c
+++ b/source/dnode/vnode/src/meta/metaCommit.c
@@ -16,6 +16,9 @@
 #include "vnodeInt.h"
 
 int metaBegin(SMeta *pMeta) {
-  // TODO
+  if (tdbBegin(pMeta->pEnv, NULL) < 0) {
+    return -1;
+  }
+
   return 0;
 }
diff --git a/source/dnode/vnode/src/tq/tq.c b/source/dnode/vnode/src/tq/tq.c
index 0aa6023eaf39cedb77bd8344dea3c1bae2aac8d4..57ea79fe8578da55f0173384b170bb62bc51e6f9 100644
--- a/source/dnode/vnode/src/tq/tq.c
+++ b/source/dnode/vnode/src/tq/tq.c
@@ -19,7 +19,7 @@ int32_t tqInit() { return tqPushMgrInit(); }
 
 void tqCleanUp() { tqPushMgrCleanUp(); }
 
-STQ* tqOpen(const char* path, SVnode* pVnode, SWal* pWal, SMeta* pVnodeMeta, SMemAllocatorFactory* allocFac) {
+STQ* tqOpen(const char* path, SVnode* pVnode, SWal* pWal, SMeta* pVnodeMeta) {
   STQ* pTq = taosMemoryMalloc(sizeof(STQ));
   if (pTq == NULL) {
     terrno = TSDB_CODE_TQ_OUT_OF_MEMORY;
@@ -29,13 +29,6 @@ STQ* tqOpen(const char* path, SVnode* pVnode, SWal* pWal, SMeta* pVnodeMeta, SMe
   pTq->pVnode = pVnode;
   pTq->pWal = pWal;
   pTq->pVnodeMeta = pVnodeMeta;
-#if 0
-  pTq->tqMemRef.pAllocatorFactory = allocFac;
-  pTq->tqMemRef.pAllocator = allocFac->create(allocFac);
-  if (pTq->tqMemRef.pAllocator == NULL) {
-    // TODO: error code of buffer pool
-  }
-#endif
   pTq->tqMeta = tqStoreOpen(pTq, path, (FTqSerialize)tqSerializeConsumer, (FTqDeserialize)tqDeserializeConsumer,
                             (FTqDelete)taosMemoryFree, 0);
   if (pTq->tqMeta == NULL) {
diff --git a/source/dnode/vnode/src/tsdb/tsdbCommit.c b/source/dnode/vnode/src/tsdb/tsdbCommit.c
index 09616a8969583abae05e152511ce886983a62823..6a2857513892a6bfb4850084a1a96b5180271fe6 100644
--- a/source/dnode/vnode/src/tsdb/tsdbCommit.c
+++ b/source/dnode/vnode/src/tsdb/tsdbCommit.c
@@ -239,7 +239,7 @@ static void tsdbStartCommit(STsdb *pRepo) {
 
 static void tsdbEndCommit(STsdb *pTsdb, int eno) {
   tsdbEndFSTxn(pTsdb);
-  tsdbFreeMemTable(pTsdb, pTsdb->imem);
+  tsdbMemTableDestroy(pTsdb, pTsdb->imem);
   pTsdb->imem = NULL;
   tsdbInfo("vgId:%d commit over, %s", REPO_ID(pTsdb), (eno == TSDB_CODE_SUCCESS) ? "succeed" : "failed");
 }
diff --git a/source/dnode/vnode/src/tsdb/tsdbCommit2.c b/source/dnode/vnode/src/tsdb/tsdbCommit2.c
new file mode 100644
index 0000000000000000000000000000000000000000..b16f2f0fdbc647e68e32a831e4850ce1788448bb
--- /dev/null
+++ b/source/dnode/vnode/src/tsdb/tsdbCommit2.c
@@ -0,0 +1,26 @@
+/*
+ * Copyright (c) 2019 TAOS Data, Inc. <jhtao@taosdata.com>
+ *
+ * This program is free software: you can use, redistribute, and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3
+ * or later ("AGPL"), as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "vnodeInt.h"
+
+int tsdbBegin(STsdb *pTsdb) {
+  STsdbMemTable *pMem;
+
+  if (tsdbMemTableCreate(pTsdb, &pTsdb->mem) < 0) {
+    return -1;
+  }
+
+  return 0;
+}
diff --git a/source/dnode/vnode/src/tsdb/tsdbMain.c b/source/dnode/vnode/src/tsdb/tsdbMain.c
index dd8723366dd7871363b9f870506961c9620ace17..df2ab558dae5d7fde53203092171084705b70982 100644
--- a/source/dnode/vnode/src/tsdb/tsdbMain.c
+++ b/source/dnode/vnode/src/tsdb/tsdbMain.c
@@ -15,94 +15,56 @@
 
 #include "vnodeInt.h"
 
-static STsdb *tsdbNew(const char *path, SVnode *pVnode, const STsdbCfg *pTsdbCfg, SMemAllocatorFactory *pMAF);
-static void   tsdbFree(STsdb *pTsdb);
-static int    tsdbOpenImpl(STsdb *pTsdb);
-static void   tsdbCloseImpl(STsdb *pTsdb);
-
-STsdb *tsdbOpen(const char *path, SVnode *pVnode, const STsdbCfg *pTsdbCfg, SMemAllocatorFactory *pMAF) {
+int tsdbOpen(SVnode *pVnode, STsdb **ppTsdb) {
   STsdb *pTsdb = NULL;
+  int    slen = 0;
 
-  // Set default TSDB Options
-  // if (pTsdbCfg == NULL) {
-  pTsdbCfg = &defautlTsdbOptions;
-  // }
+  *ppTsdb = NULL;
+  slen = strlen(tfsGetPrimaryPath(pVnode->pTfs)) + strlen(pVnode->path) + strlen(VNODE_TSDB_DIR) + 3;
 
-  // Validate the options
-  if (tsdbValidateOptions(pTsdbCfg) < 0) {
-    // TODO: handle error
-    return NULL;
-  }
-
-  // Create the handle
-  pTsdb = tsdbNew(path, pVnode, pTsdbCfg, pMAF);
+  // create handle
+  pTsdb = (STsdb *)taosMemoryCalloc(1, sizeof(*pTsdb) + slen);
   if (pTsdb == NULL) {
-    // TODO: handle error
-    return NULL;
+    terrno = TSDB_CODE_OUT_OF_MEMORY;
+    return -1;
   }
 
-  taosMkDir(path);
-
-  // Open the TSDB
-  if (tsdbOpenImpl(pTsdb) < 0) {
-    // TODO: handle error
-    return NULL;
-  }
+  pTsdb->path = (char *)&pTsdb[1];
+  sprintf(pTsdb->path, "%s%s%s%s%s", tfsGetPrimaryPath(pVnode->pTfs), TD_DIRSEP, pVnode->path, TD_DIRSEP,
+          VNODE_TSDB_DIR);
+  pTsdb->pVnode = pVnode;
+  pTsdb->vgId = TD_VID(pVnode);
+  pTsdb->repoLocked = false;
+  tdbMutexInit(&pTsdb->mutex, NULL);
+  pTsdb->config = pVnode->config.tsdbCfg;
+  pTsdb->fs = tsdbNewFS(&pTsdb->config);
 
-  return pTsdb;
-}
+  // create dir (TODO: use tfsMkdir)
+  taosMkDir(pTsdb->path);
 
-void tsdbClose(STsdb *pTsdb) {
-  if (pTsdb) {
-    tsdbCloseImpl(pTsdb);
-    tsdbFree(pTsdb);
+  // open tsdb
+  if (tsdbOpenFS(pTsdb) < 0) {
+    goto _err;
   }
-}
-
-/* ------------------------ STATIC METHODS ------------------------ */
-static STsdb *tsdbNew(const char *path, SVnode *pVnode, const STsdbCfg *pTsdbCfg, SMemAllocatorFactory *pMAF) {
-  STsdb *pTsdb = NULL;
 
-  pTsdb = (STsdb *)taosMemoryCalloc(1, sizeof(STsdb));
-  if (pTsdb == NULL) {
-    // TODO: handle error
-    return NULL;
-  }
+  tsdbDebug("vgId: %d tsdb is opened", TD_VID(pVnode));
 
-  pTsdb->path = strdup(path);
-  pTsdb->vgId = TD_VID(pVnode);
-  pTsdb->pVnode = pVnode;
-  tsdbOptionsCopy(&(pTsdb->config), pTsdbCfg);
-  pTsdb->pmaf = pMAF;
-  pTsdb->fs = tsdbNewFS(pTsdbCfg);
+  *ppTsdb = pTsdb;
+  return 0;
 
-  return pTsdb;
+_err:
+  taosMemoryFree(pTsdb);
+  return -1;
 }
 
-static void tsdbFree(STsdb *pTsdb) {
+int tsdbClose(STsdb *pTsdb) {
   if (pTsdb) {
-    // tsdbFreeSmaEnv(REPO_TSMA_ENV(pTsdb));
-    // tsdbFreeSmaEnv(REPO_RSMA_ENV(pTsdb));
-    tsdbFreeFS(pTsdb->fs);
-    taosMemoryFreeClear(pTsdb->path);
+    tsdbCloseFS(pTsdb);
     taosMemoryFree(pTsdb);
   }
-}
-
-static int tsdbOpenImpl(STsdb *pTsdb) {
-  tsdbOpenFS(pTsdb);
-
-  // tsdbInitSma(pTsdb);
-  // TODO
-
   return 0;
 }
 
-static void tsdbCloseImpl(STsdb *pTsdb) {
-  tsdbCloseFS(pTsdb);
-  // TODO
-}
-
 int tsdbLockRepo(STsdb *pTsdb) {
   int code = taosThreadMutexLock(&pTsdb->mutex);
   if (code != 0) {
diff --git a/source/dnode/vnode/src/tsdb/tsdbMemTable.c b/source/dnode/vnode/src/tsdb/tsdbMemTable.c
index bea2b66af8ad94a9129489c073940077d270c37b..dae70d955c17784e6b09b5c15e28ac940543ffdc 100644
--- a/source/dnode/vnode/src/tsdb/tsdbMemTable.c
+++ b/source/dnode/vnode/src/tsdb/tsdbMemTable.c
@@ -24,51 +24,46 @@ static int      tsdbTbDataComp(const void *arg1, const void *arg2);
 static char    *tsdbTbDataGetUid(const void *arg);
 static int      tsdbAppendTableRowToCols(STable *pTable, SDataCols *pCols, STSchema **ppSchema, STSRow *row);
 
-STsdbMemTable *tsdbNewMemTable(STsdb *pTsdb) {
-  STsdbMemTable *pMemTable = (STsdbMemTable *)taosMemoryCalloc(1, sizeof(*pMemTable));
+int tsdbMemTableCreate(STsdb *pTsdb, STsdbMemTable **ppMemTable) {
+  STsdbMemTable *pMemTable;
+  SVnode        *pVnode;
+
+  *ppMemTable = NULL;
+  pVnode = pTsdb->pVnode;
+
+  // alloc handle
+  pMemTable = (STsdbMemTable *)taosMemoryCalloc(1, sizeof(*pMemTable));
   if (pMemTable == NULL) {
-    terrno = TSDB_CODE_OUT_OF_MEMORY;
-    return NULL;
+    return -1;
   }
 
+  pMemTable->pPool = pTsdb->pVnode->inUse;
   T_REF_INIT_VAL(pMemTable, 1);
-  taosInitRWLatch(&(pMemTable->latch));
-  pMemTable->keyMax = TSKEY_MIN;
+  taosInitRWLatch(&pMemTable->latch);
   pMemTable->keyMin = TSKEY_MAX;
+  pMemTable->keyMax = TSKEY_MIN;
   pMemTable->nRow = 0;
-  pMemTable->pMA = pTsdb->pmaf->create(pTsdb->pmaf);
-  if (pMemTable->pMA == NULL) {
-    taosMemoryFree(pMemTable);
-    return NULL;
-  }
-
-  // Initialize the container
-  pMemTable->pSlIdx =
-      tSkipListCreate(5, TSDB_DATA_TYPE_BIGINT, sizeof(tb_uid_t), tsdbTbDataComp, SL_DISCARD_DUP_KEY, tsdbTbDataGetUid);
+  pMemTable->pSlIdx = tSkipListCreate(pVnode->config.tsdbCfg.slLevel, TSDB_DATA_TYPE_BIGINT, sizeof(tb_uid_t),
+                                      tsdbTbDataComp, SL_DISCARD_DUP_KEY, tsdbTbDataGetUid);
   if (pMemTable->pSlIdx == NULL) {
-    pTsdb->pmaf->destroy(pTsdb->pmaf, pMemTable->pMA);
     taosMemoryFree(pMemTable);
-    return NULL;
+    return -1;
   }
 
   pMemTable->pHashIdx = taosHashInit(1024, taosGetDefaultHashFunction(TSDB_DATA_TYPE_BIGINT), false, HASH_NO_LOCK);
   if (pMemTable->pHashIdx == NULL) {
-    pTsdb->pmaf->destroy(pTsdb->pmaf, pMemTable->pMA);
     tSkipListDestroy(pMemTable->pSlIdx);
     taosMemoryFree(pMemTable);
-    return NULL;
+    return -1;
   }
 
-  return pMemTable;
+  return 0;
 }
 
-void tsdbFreeMemTable(STsdb *pTsdb, STsdbMemTable *pMemTable) {
+void tsdbMemTableDestroy(STsdb *pTsdb, STsdbMemTable *pMemTable) {
   if (pMemTable) {
     taosHashCleanup(pMemTable->pHashIdx);
     tSkipListDestroy(pMemTable->pSlIdx);
-    if (pMemTable->pMA) {
-      pTsdb->pmaf->destroy(pTsdb->pmaf, pMemTable->pMA);
-    }
     taosMemoryFree(pMemTable);
   }
 }
diff --git a/source/dnode/vnode/src/tsdb/tsdbWrite.c b/source/dnode/vnode/src/tsdb/tsdbWrite.c
index 910b5adc963559f712868937abfe1d5ad160b526..2b34714e11a2c2f30a390d962fd2d3d95289faea 100644
--- a/source/dnode/vnode/src/tsdb/tsdbWrite.c
+++ b/source/dnode/vnode/src/tsdb/tsdbWrite.c
@@ -25,11 +25,11 @@
  */
 int tsdbInsertData(STsdb *pTsdb, SSubmitReq *pMsg, SSubmitRsp *pRsp) {
   // Check if mem is there. If not, create one.
-  if (pTsdb->mem == NULL) {
-    pTsdb->mem = tsdbNewMemTable(pTsdb);
-    if (pTsdb->mem == NULL) {
-      return -1;
-    }
-  }
+  // if (pTsdb->mem == NULL) {
+  //   pTsdb->mem = tsdbMemTableCreate(pTsdb);
+  //   if (pTsdb->mem == NULL) {
+  //     return -1;
+  //   }
+  // }
   return tsdbMemTableInsert(pTsdb, pTsdb->mem, pMsg, pRsp);
 }
\ No newline at end of file
diff --git a/source/dnode/vnode/src/vnd/vnodeBufferPool2.c b/source/dnode/vnode/src/vnd/vnodeBufPool.c
similarity index 91%
rename from source/dnode/vnode/src/vnd/vnodeBufferPool2.c
rename to source/dnode/vnode/src/vnd/vnodeBufPool.c
index d63c86734a4573112fd449dc8cb23e6a8f91af7e..0125cdc82f9432c1f33482f0609f73c2daf53014 100644
--- a/source/dnode/vnode/src/vnd/vnodeBufferPool2.c
+++ b/source/dnode/vnode/src/vnd/vnodeBufPool.c
@@ -17,7 +17,7 @@
 
 /* ------------------------ STRUCTURES ------------------------ */
 
-static int vnodeBufPoolCreate(int size, SVBufPool **ppPool);
+static int vnodeBufPoolCreate(int64_t size, SVBufPool **ppPool);
 static int vnodeBufPoolDestroy(SVBufPool *pPool);
 
 int vnodeOpenBufPool(SVnode *pVnode, int64_t size) {
@@ -30,17 +30,17 @@ int vnodeOpenBufPool(SVnode *pVnode, int64_t size) {
     // create pool
     ret = vnodeBufPoolCreate(size, &pPool);
     if (ret < 0) {
-      vError("vgId:%d failed to open vnode buffer pool since %s", TD_VNODE_ID(pVnode), tstrerror(terrno));
+      vError("vgId:%d failed to open vnode buffer pool since %s", TD_VID(pVnode), tstrerror(terrno));
       vnodeCloseBufPool(pVnode);
       return -1;
     }
 
-    // add pool to queue
+    // add pool to vnode
     pPool->next = pVnode->pPool;
     pVnode->pPool = pPool;
   }
 
-  vDebug("vgId:%d vnode buffer pool is opened, pool size: %" PRId64, TD_VNODE_ID(pVnode), size);
+  vDebug("vgId:%d vnode buffer pool is opened, pool size: %" PRId64, TD_VID(pVnode), size);
 
   return 0;
 }
@@ -53,7 +53,7 @@ int vnodeCloseBufPool(SVnode *pVnode) {
     vnodeBufPoolDestroy(pPool);
   }
 
-  vDebug("vgId:%d vnode buffer pool is closed", TD_VNODE_ID(pVnode));
+  vDebug("vgId:%d vnode buffer pool is closed", TD_VID(pVnode));
 
   return 0;
 }
@@ -75,7 +75,7 @@ void vnodeBufPoolReset(SVBufPool *pPool) {
   pPool->ptr = pPool->node.data;
 }
 
-void *vnodeBufPoolMalloc(SVBufPool *pPool, size_t size) {
+void *vnodeBufPoolMalloc(SVBufPool *pPool, int size) {
   SVBufPoolNode *pNode;
   void          *p;
 
@@ -120,7 +120,7 @@ void vnodeBufPoolFree(SVBufPool *pPool, void *p) {
 }
 
 // STATIC METHODS -------------------
-static int vnodeBufPoolCreate(int size, SVBufPool **ppPool) {
+static int vnodeBufPoolCreate(int64_t size, SVBufPool **ppPool) {
   SVBufPool *pPool;
 
   pPool = taosMemoryMalloc(sizeof(SVBufPool) + size);
diff --git a/source/dnode/vnode/src/vnd/vnodeCfg.c b/source/dnode/vnode/src/vnd/vnodeCfg.c
index 98921a9efe83245dcf83fe51fa54ac853f41de46..4f9631979cf5623016aeab8d99146f8f712c7235 100644
--- a/source/dnode/vnode/src/vnd/vnodeCfg.c
+++ b/source/dnode/vnode/src/vnd/vnodeCfg.c
@@ -21,10 +21,8 @@ const SVnodeCfg vnodeCfgDefault = {
     .dbId = 0,
     .szPage = 4096,
     .szCache = 256,
-    .wsize = 96 * 1024 * 1024,
-    .ssize = 1 * 1024 * 1024,
-    .lsize = 1024,
-    .isHeapAllocator = false,
+    .szBuf = 96 * 1024 * 1024,
+    .isHeap = false,
     .ttl = 0,
     .keep = 0,
     .streamMode = 0,
@@ -32,6 +30,7 @@ const SVnodeCfg vnodeCfgDefault = {
     .tsdbCfg = {.precision = TWO_STAGE_COMP,
                 .update = 0,
                 .compression = 2,
+                .slLevel = 5,
                 .days = 10,
                 .minRows = 100,
                 .maxRows = 4096,
@@ -57,10 +56,8 @@ int vnodeEncodeConfig(const void *pObj, SJson *pJson) {
   if (tjsonAddIntegerToObject(pJson, "dbId", pCfg->dbId) < 0) return -1;
   if (tjsonAddIntegerToObject(pJson, "szPage", pCfg->szPage) < 0) return -1;
   if (tjsonAddIntegerToObject(pJson, "szCache", pCfg->szCache) < 0) return -1;
-  if (tjsonAddIntegerToObject(pJson, "wsize", pCfg->wsize) < 0) return -1;
-  if (tjsonAddIntegerToObject(pJson, "ssize", pCfg->ssize) < 0) return -1;
-  if (tjsonAddIntegerToObject(pJson, "lsize", pCfg->lsize) < 0) return -1;
-  if (tjsonAddIntegerToObject(pJson, "isHeap", pCfg->isHeapAllocator) < 0) return -1;
+  if (tjsonAddIntegerToObject(pJson, "szBuf", pCfg->szBuf) < 0) return -1;
+  if (tjsonAddIntegerToObject(pJson, "isHeap", pCfg->isHeap) < 0) return -1;
   if (tjsonAddIntegerToObject(pJson, "ttl", pCfg->ttl) < 0) return -1;
   if (tjsonAddIntegerToObject(pJson, "keep", pCfg->keep) < 0) return -1;
   if (tjsonAddIntegerToObject(pJson, "streamMode", pCfg->streamMode) < 0) return -1;
@@ -68,6 +65,7 @@ int vnodeEncodeConfig(const void *pObj, SJson *pJson) {
   if (tjsonAddIntegerToObject(pJson, "precision", pCfg->tsdbCfg.precision) < 0) return -1;
   if (tjsonAddIntegerToObject(pJson, "update", pCfg->tsdbCfg.update) < 0) return -1;
   if (tjsonAddIntegerToObject(pJson, "compression", pCfg->tsdbCfg.compression) < 0) return -1;
+  if (tjsonAddIntegerToObject(pJson, "slLevel", pCfg->tsdbCfg.slLevel) < 0) return -1;
   if (tjsonAddIntegerToObject(pJson, "daysPerFile", pCfg->tsdbCfg.days) < 0) return -1;
   if (tjsonAddIntegerToObject(pJson, "minRows", pCfg->tsdbCfg.minRows) < 0) return -1;
   if (tjsonAddIntegerToObject(pJson, "maxRows", pCfg->tsdbCfg.maxRows) < 0) return -1;
@@ -97,10 +95,8 @@ int vnodeDecodeConfig(const SJson *pJson, void *pObj) {
   if (tjsonGetNumberValue(pJson, "dbId", pCfg->dbId) < 0) return -1;
   if (tjsonGetNumberValue(pJson, "szPage", pCfg->szPage) < 0) return -1;
   if (tjsonGetNumberValue(pJson, "szCache", pCfg->szCache) < 0) return -1;
-  if (tjsonGetNumberValue(pJson, "wsize", pCfg->wsize) < 0) return -1;
-  if (tjsonGetNumberValue(pJson, "ssize", pCfg->ssize) < 0) return -1;
-  if (tjsonGetNumberValue(pJson, "lsize", pCfg->lsize) < 0) return -1;
-  if (tjsonGetNumberValue(pJson, "isHeap", pCfg->isHeapAllocator) < 0) return -1;
+  if (tjsonGetNumberValue(pJson, "szBuf", pCfg->szBuf) < 0) return -1;
+  if (tjsonGetNumberValue(pJson, "isHeap", pCfg->isHeap) < 0) return -1;
   if (tjsonGetNumberValue(pJson, "ttl", pCfg->ttl) < 0) return -1;
   if (tjsonGetNumberValue(pJson, "keep", pCfg->keep) < 0) return -1;
   if (tjsonGetNumberValue(pJson, "streamMode", pCfg->streamMode) < 0) return -1;
@@ -108,6 +104,7 @@ int vnodeDecodeConfig(const SJson *pJson, void *pObj) {
   if (tjsonGetNumberValue(pJson, "precision", pCfg->tsdbCfg.precision) < 0) return -1;
   if (tjsonGetNumberValue(pJson, "update", pCfg->tsdbCfg.update) < 0) return -1;
   if (tjsonGetNumberValue(pJson, "compression", pCfg->tsdbCfg.compression) < 0) return -1;
+  if (tjsonGetNumberValue(pJson, "slLevel", pCfg->tsdbCfg.slLevel) < 0) return -1;
   if (tjsonGetNumberValue(pJson, "daysPerFile", pCfg->tsdbCfg.days) < 0) return -1;
   if (tjsonGetNumberValue(pJson, "minRows", pCfg->tsdbCfg.minRows) < 0) return -1;
   if (tjsonGetNumberValue(pJson, "maxRows", pCfg->tsdbCfg.maxRows) < 0) return -1;
diff --git a/source/dnode/vnode/src/vnd/vnodeCommit.c b/source/dnode/vnode/src/vnd/vnodeCommit.c
index 61480a7b0bcea2c2b2bfcc3b1291d29b592639b0..8b2f22f1bac68d4b3b0f2658f26a7d84f410a74b 100644
--- a/source/dnode/vnode/src/vnd/vnodeCommit.c
+++ b/source/dnode/vnode/src/vnd/vnodeCommit.c
@@ -26,7 +26,19 @@ static int  vnodeCommit(void *arg);
 static void vnodeWaitCommit(SVnode *pVnode);
 
 int vnodeBegin(SVnode *pVnode) {
-  // begin buffer pool
+  // alloc buffer pool
+  /* pthread_mutex_lock(); */
+
+  while (pVnode->pPool == NULL) {
+    /* pthread_cond_wait(); */
+  }
+
+  pVnode->inUse = pVnode->pPool;
+  pVnode->pPool = pVnode->inUse->next;
+  pVnode->inUse->next = NULL;
+  /* ref pVnode->inUse buffer pool */
+
+  /* pthread_mutex_unlock(); */
 
   // begin meta
   if (metaBegin(pVnode->pMeta) < 0) {
@@ -35,12 +47,10 @@ int vnodeBegin(SVnode *pVnode) {
   }
 
   // begin tsdb
-#if 0
   if (tsdbBegin(pVnode->pTsdb) < 0) {
     vError("vgId: %d failed to begin tsdb since %s", TD_VID(pVnode), tstrerror(terrno));
     return -1;
   }
-#endif
 
   return 0;
 }
@@ -162,7 +172,7 @@ _err:
 int vnodeAsyncCommit(SVnode *pVnode) {
   vnodeWaitCommit(pVnode);
 
-  vnodeBufPoolSwitch(pVnode);
+  // vnodeBufPoolSwitch(pVnode);
   tsdbPrepareCommit(pVnode->pTsdb);
 
   vnodeScheduleTask(vnodeCommit, pVnode);
@@ -184,7 +194,7 @@ static int vnodeCommit(void *arg) {
   tqCommit(pVnode->pTq);
   tsdbCommit(pVnode->pTsdb);
 
-  vnodeBufPoolRecycle(pVnode);
+  // vnodeBufPoolRecycle(pVnode);
   tsem_post(&(pVnode->canCommit));
   return 0;
 }
diff --git a/source/dnode/vnode/src/vnd/vnodeOpen.c b/source/dnode/vnode/src/vnd/vnodeOpen.c
index 8f32f30824587b87c5db8a875236c5e07fe87afe..dcb1af8963b449d21a426c937cdaecc4b5e39ebf 100644
--- a/source/dnode/vnode/src/vnd/vnodeOpen.c
+++ b/source/dnode/vnode/src/vnd/vnodeOpen.c
@@ -83,7 +83,7 @@ SVnode *vnodeOpen(const char *path, STfs *pTfs, SMsgCb msgCb) {
   tsem_init(&(pVnode->canCommit), 0, 1);
 
   // open buffer pool
-  if (vnodeOpenBufPool(pVnode) < 0) {
+  if (vnodeOpenBufPool(pVnode, pVnode->config.isHeap ? 0 : pVnode->config.szBuf / 3) < 0) {
     vError("vgId: %d failed to open vnode buffer pool since %s", TD_VID(pVnode), tstrerror(terrno));
     goto _err;
   }
@@ -95,9 +95,7 @@ SVnode *vnodeOpen(const char *path, STfs *pTfs, SMsgCb msgCb) {
   }
 
   // open tsdb
-  sprintf(tdir, "%s%s%s", dir, TD_DIRSEP, VNODE_TSDB_DIR);
-  pVnode->pTsdb = tsdbOpen(tdir, pVnode, &(pVnode->config.tsdbCfg), vBufPoolGetMAF(pVnode));
-  if (pVnode->pTsdb == NULL) {
+  if (tsdbOpen(pVnode, &pVnode->pTsdb) < 0) {
     vError("vgId: %d failed to open vnode tsdb since %s", TD_VID(pVnode), tstrerror(terrno));
     goto _err;
   }
@@ -112,7 +110,7 @@ SVnode *vnodeOpen(const char *path, STfs *pTfs, SMsgCb msgCb) {
 
   // open tq
   sprintf(tdir, "%s%s%s", dir, TD_DIRSEP, VNODE_TQ_DIR);
-  pVnode->pTq = tqOpen(tdir, pVnode, pVnode->pWal, pVnode->pMeta, vBufPoolGetMAF(pVnode));
+  pVnode->pTq = tqOpen(tdir, pVnode, pVnode->pWal, pVnode->pMeta);
   if (pVnode->pTq == NULL) {
     vError("vgId: %d failed to open vnode tq since %s", TD_VID(pVnode), tstrerror(terrno));
     goto _err;
diff --git a/source/dnode/vnode/src/vnd/vnodeSvr.c b/source/dnode/vnode/src/vnd/vnodeSvr.c
index 01241ec6864fd11d91797b4736a15b318f99cbac..fb611efad8de47d4a1f3fb0d2f475e0f70eccab6 100644
--- a/source/dnode/vnode/src/vnd/vnodeSvr.c
+++ b/source/dnode/vnode/src/vnd/vnodeSvr.c
@@ -46,7 +46,7 @@ int vnodeProcessWriteReq(SVnode *pVnode, SRpcMsg *pMsg, int64_t version, SRpcMsg
   int   ret;
 
   if (pVnode->config.streamMode == 0) {
-    ptr = vnodeMalloc(pVnode, pMsg->contLen);
+    // ptr = vnodeMalloc(pVnode, pMsg->contLen);
     if (ptr == NULL) {
       // TODO: handle error
     }
@@ -125,7 +125,7 @@ int vnodeProcessWriteReq(SVnode *pVnode, SRpcMsg *pMsg, int64_t version, SRpcMsg
   pVnode->state.applied = version;
 
   // Check if it needs to commit
-  if (vnodeShouldCommit(pVnode)) {
+  if (0 /*vnodeShouldCommit(pVnode)*/) {
     // tsem_wait(&(pVnode->canCommit));
     if (vnodeAsyncCommit(pVnode) < 0) {
       // TODO: handle error