diff --git a/include/util/tfile.h b/include/util/tfile.h
index af4c19e7d19ebcd6fb9d24f435bb51073cd9836b..b3d141c4434154bf0ac6887aae1dc0e0a12b8efa 100644
--- a/include/util/tfile.h
+++ b/include/util/tfile.h
@@ -38,6 +38,7 @@ int64_t tfOpenCreateWriteAppend(const char *pathname);
 int64_t tfClose(int64_t tfd);
 int64_t tfWrite(int64_t tfd, void *buf, int64_t count);
 int64_t tfRead(int64_t tfd, void *buf, int64_t count);
+int64_t tfPread(int64_t tfd, void *buf, int64_t count, int64_t offset);
 int32_t tfFsync(int64_t tfd);
 bool    tfValid(int64_t tfd);
 int64_t tfLseek(int64_t tfd, int64_t offset, int32_t whence);
@@ -47,4 +48,4 @@ int32_t tfFtruncate(int64_t tfd, int64_t length);
 }
 #endif
 
-#endif  /*_TD_UTIL_FILE_H*/
+#endif /*_TD_UTIL_FILE_H*/
diff --git a/source/libs/index/inc/index_fst.h b/source/libs/index/inc/index_fst.h
index 73c79b2619512a3f769911f86d2ae65fe45af8b6..072ec93e4e648ae55c945f291e0c0d73dc51cbc0 100644
--- a/source/libs/index/inc/index_fst.h
+++ b/source/libs/index/inc/index_fst.h
@@ -142,7 +142,8 @@ uint64_t fstStateInputLen(FstState* state);
 // end_addr
 uint64_t fstStateEndAddrForOneTransNext(FstState* state, FstSlice* data);
 uint64_t fstStateEndAddrForOneTrans(FstState* state, FstSlice* data, PackSizes sizes);
-uint64_t fstStateEndAddrForAnyTrans(FstState* state, uint64_t version, FstSlice* date, PackSizes sizes, uint64_t nTrans);
+uint64_t fstStateEndAddrForAnyTrans(FstState* state, uint64_t version, FstSlice* date, PackSizes sizes,
+                                    uint64_t nTrans);
 // input
 uint8_t fstStateInput(FstState* state, FstNode* node);
 uint8_t fstStateInputForAnyTrans(FstState* state, FstNode* node, uint64_t i);
@@ -255,9 +256,10 @@ typedef struct FstMeta {
 } FstMeta;
 
 typedef struct Fst {
-  FstMeta*  meta;
-  FstSlice* data;  //
-  FstNode*  root;  //
+  FstMeta*        meta;
+  FstSlice*       data;  //
+  FstNode*        root;  //
+  pthread_mutex_t mtx;
 } Fst;
 
 // refactor simple function
@@ -310,7 +312,8 @@ StreamWithStateResult* swsResultCreate(FstSlice* data, FstOutput fOut, void* sta
 void                   swsResultDestroy(StreamWithStateResult* result);
 
 typedef void* (*StreamCallback)(void*);
-StreamWithState* streamWithStateCreate(Fst* fst, AutomationCtx* automation, FstBoundWithData* min, FstBoundWithData* max);
+StreamWithState* streamWithStateCreate(Fst* fst, AutomationCtx* automation, FstBoundWithData* min,
+                                       FstBoundWithData* max);
 
 void streamWithStateDestroy(StreamWithState* sws);
 
diff --git a/source/libs/index/inc/index_tfile.h b/source/libs/index/inc/index_tfile.h
index d8e69b5fdece6eeae9d0ce4809fb2d04f2b91e4c..4928e01a6322ae487c00580d935ba37d9f0c00fd 100644
--- a/source/libs/index/inc/index_tfile.h
+++ b/source/libs/index/inc/index_tfile.h
@@ -77,6 +77,7 @@ typedef struct TFileReader {
   Fst*        fst;
   WriterCtx*  ctx;
   TFileHeader header;
+  bool        remove;
 } TFileReader;
 
 typedef struct IndexTFile {
diff --git a/source/libs/index/src/index.c b/source/libs/index/src/index.c
index 6d64bdbd65858fe42fba06f090d69ad357e1ab36..5167196031eb822b5540fa3c7b224e64ac859b0a 100644
--- a/source/libs/index/src/index.c
+++ b/source/libs/index/src/index.c
@@ -94,7 +94,6 @@ void indexClose(SIndex* sIdx) {
 #endif
 
 #ifdef USE_INVERTED_INDEX
-  indexCacheDestroy(sIdx->cache);
   void* iter = taosHashIterate(sIdx->colObj, NULL);
   while (iter) {
     IndexCache** pCache = iter;
@@ -104,6 +103,7 @@ void indexClose(SIndex* sIdx) {
   taosHashCleanup(sIdx->colObj);
   pthread_mutex_destroy(&sIdx->mtx);
 #endif
+  free(sIdx->path);
   free(sIdx);
   return;
 }
diff --git a/source/libs/index/src/index_cache.c b/source/libs/index/src/index_cache.c
index 882091afb9a64f271b0bad4ada809f13d285a82b..0e46445a00db0a2bcc4c40b03b4b6ea95fa64e52 100644
--- a/source/libs/index/src/index_cache.c
+++ b/source/libs/index/src/index_cache.c
@@ -20,7 +20,7 @@
 
 #define MAX_INDEX_KEY_LEN 256  // test only, change later
 
-#define MEM_TERM_LIMIT 200
+#define MEM_TERM_LIMIT 10000 * 10
 // ref index_cache.h:22
 //#define CACHE_KEY_LEN(p) \
 //  (sizeof(int32_t) + sizeof(uint16_t) + sizeof(p->colType) + sizeof(p->nColVal) + p->nColVal + sizeof(uint64_t) +
@@ -110,7 +110,10 @@ void indexCacheDestroySkiplist(SSkipList* slt) {
   while (tSkipListIterNext(iter)) {
     SSkipListNode* node = tSkipListIterGet(iter);
     CacheTerm*     ct = (CacheTerm*)SL_GET_NODE_DATA(node);
-    if (ct != NULL) {}
+    if (ct != NULL) {
+      free(ct->colVal);
+      free(ct);
+    }
   }
   tSkipListDestroyIter(iter);
   tSkipListDestroy(slt);
@@ -271,7 +274,7 @@ int indexCacheSearch(void* cache, SIndexTermQuery* query, SArray* result, STermV
   SIndexTerm*     term = query->term;
   EIndexQueryType qtype = query->qType;
   CacheTerm       ct = {.colVal = term->colVal, .version = atomic_load_32(&pCache->version)};
-  indexCacheDebug(pCache);
+  // indexCacheDebug(pCache);
 
   int ret = indexQueryMem(mem, &ct, qtype, result, s);
   if (ret == 0 && *s != kTypeDeletion) {
diff --git a/source/libs/index/src/index_fst.c b/source/libs/index/src/index_fst.c
index 18024fa39110c3a6acb3052e76e84c332ef425bf..04a08dafd2641f7fd1f91d660d8c4ff4013abeb2 100644
--- a/source/libs/index/src/index_fst.c
+++ b/source/libs/index/src/index_fst.c
@@ -354,7 +354,8 @@ uint64_t fstStateEndAddrForOneTrans(FstState* s, FstSlice* data, PackSizes sizes
   return FST_SLICE_LEN(data) - 1 - fstStateInputLen(s) - 1  // pack size
          - FST_GET_TRANSITION_PACK_SIZE(sizes) - FST_GET_OUTPUT_PACK_SIZE(sizes);
 }
-uint64_t fstStateEndAddrForAnyTrans(FstState* state, uint64_t version, FstSlice* date, PackSizes sizes, uint64_t nTrans) {
+uint64_t fstStateEndAddrForAnyTrans(FstState* state, uint64_t version, FstSlice* date, PackSizes sizes,
+                                    uint64_t nTrans) {
   uint8_t oSizes = FST_GET_OUTPUT_PACK_SIZE(sizes);
   uint8_t finalOsize = !fstStateIsFinalState(state) ? 0 : oSizes;
   return FST_SLICE_LEN(date) - 1 - fstStateNtransLen(state) - 1                     // pack size
@@ -403,8 +404,8 @@ CompiledAddr fstStateTransAddrForAnyTrans(FstState* s, FstNode* node, uint64_t i
 
   FstSlice* slice = &node->data;
   uint8_t   tSizes = FST_GET_TRANSITION_PACK_SIZE(node->sizes);
-  uint64_t  at = node->start - fstStateNtransLen(s) - 1 - fstStateTransIndexSize(s, node->version, node->nTrans) - node->nTrans -
-                (i * tSizes) - tSizes;
+  uint64_t  at = node->start - fstStateNtransLen(s) - 1 - fstStateTransIndexSize(s, node->version, node->nTrans) -
+                node->nTrans - (i * tSizes) - tSizes;
   uint8_t* data = fstSliceData(slice, NULL);
   return unpackDelta(data + at, tSizes, node->end);
 }
@@ -595,7 +596,8 @@ FstNode* fstNodeCreate(int64_t version, CompiledAddr addr, FstSlice* slice) {
     n->isFinal = fstStateIsFinalState(&st);                                // s.is_final_state();
     n->nTrans = nTrans;
     n->sizes = sz;
-    n->finalOutput = fstStateFinalOutput(&st, version, &data, sz, nTrans);  // s.final_output(version, data, sz, ntrans);
+    n->finalOutput =
+        fstStateFinalOutput(&st, version, &data, sz, nTrans);  // s.final_output(version, data, sz, ntrans);
   }
   return n;
 }
@@ -875,9 +877,7 @@ void* fstBuilderInsertInner(FstBuilder* b) {
   // b->wrt = NULL;
   return b->wrt;
 }
-void fstBuilderFinish(FstBuilder* b) {
-  fstBuilderInsertInner(b);
-}
+void fstBuilderFinish(FstBuilder* b) { fstBuilderInsertInner(b); }
 
 FstSlice fstNodeAsSlice(FstNode* node) {
   FstSlice* slice = &node->data;
@@ -894,9 +894,7 @@ FstLastTransition* fstLastTransitionCreate(uint8_t inp, Output out) {
   return trn;
 }
 
-void fstLastTransitionDestroy(FstLastTransition* trn) {
-  free(trn);
-}
+void fstLastTransitionDestroy(FstLastTransition* trn) { free(trn); }
 void fstBuilderNodeUnfinishedLastCompiled(FstBuilderNodeUnfinished* unNode, CompiledAddr addr) {
   FstLastTransition* trn = unNode->last;
   if (trn == NULL) { return; }
@@ -959,9 +957,10 @@ Fst* fstCreate(FstSlice* slice) {
   fst->meta->checkSum = checkSum;
 
   FstSlice* s = calloc(1, sizeof(FstSlice));
-  *s = fstSliceCopy(slice, 0, FST_SLICE_LEN(slice));
+  *s = fstSliceCopy(slice, 0, FST_SLICE_LEN(slice) - 1);
   fst->data = s;
 
+  pthread_mutex_init(&fst->mtx, NULL);
   return fst;
 
 FST_CREAT_FAILED:
@@ -973,14 +972,18 @@ void fstDestroy(Fst* fst) {
     free(fst->meta);
     fstSliceDestroy(fst->data);
     free(fst->data);
+    pthread_mutex_destroy(&fst->mtx);
   }
   free(fst);
 }
 
 bool fstGet(Fst* fst, FstSlice* b, Output* out) {
+  // dec lock range
+  pthread_mutex_lock(&fst->mtx);
   FstNode* root = fstGetRoot(fst);
   Output   tOut = 0;
   int32_t  len;
+
   uint8_t* data = fstSliceData(b, &len);
 
   SArray* nodes = (SArray*)taosArrayInit(len, sizeof(FstNode*));
@@ -988,7 +991,10 @@ bool fstGet(Fst* fst, FstSlice* b, Output* out) {
   for (uint32_t i = 0; i < len; i++) {
     uint8_t inp = data[i];
     Output  res = 0;
-    if (false == fstNodeFindInput(root, inp, &res)) { return false; }
+    if (false == fstNodeFindInput(root, inp, &res)) {
+      pthread_mutex_unlock(&fst->mtx);
+      return false;
+    }
 
     FstTransition trn;
     fstNodeGetTransitionAt(root, res, &trn);
@@ -997,6 +1003,7 @@ bool fstGet(Fst* fst, FstSlice* b, Output* out) {
     taosArrayPush(nodes, &root);
   }
   if (!FST_NODE_IS_FINAL(root)) {
+    pthread_mutex_unlock(&fst->mtx);
     return false;
   } else {
     tOut = tOut + FST_NODE_FINAL_OUTPUT(root);
@@ -1007,13 +1014,13 @@ bool fstGet(Fst* fst, FstSlice* b, Output* out) {
     fstNodeDestroy(*node);
   }
   taosArrayDestroy(nodes);
-
   fst->root = NULL;
+  pthread_mutex_unlock(&fst->mtx);
   *out = tOut;
-
   return true;
 }
 FstStreamBuilder* fstSearch(Fst* fst, AutomationCtx* ctx) {
+  // refactor later
   return fstStreamBuilderCreate(fst, ctx);
 }
 StreamWithState* streamBuilderIntoStream(FstStreamBuilder* sb) {
@@ -1021,24 +1028,30 @@ StreamWithState* streamBuilderIntoStream(FstStreamBuilder* sb) {
   return streamWithStateCreate(sb->fst, sb->aut, sb->min, sb->max);
 }
 FstStreamWithStateBuilder* fstSearchWithState(Fst* fst, AutomationCtx* ctx) {
+  // refactor later
   return fstStreamBuilderCreate(fst, ctx);
 }
 
 FstNode* fstGetRoot(Fst* fst) {
-  if (fst->root != NULL) { return fst->root; }
   CompiledAddr rAddr = fstGetRootAddr(fst);
-  fst->root = fstGetNode(fst, rAddr);
-  return fst->root;
+  return fstGetNode(fst, rAddr);
+  // pthread_mutex_lock(&fst->mtx);
+  // if (fst->root != NULL) {
+  //  // pthread_mutex_unlock(&fst->mtx);
+  //  return fst->root;
+  //}
+  // CompiledAddr rAddr = fstGetRootAddr(fst);
+  // fst->root = fstGetNode(fst, rAddr);
+  //// pthread_mutex_unlock(&fst->mtx);
+  // return fst->root;
 }
+
 FstNode* fstGetNode(Fst* fst, CompiledAddr addr) {
+  // refactor later
   return fstNodeCreate(fst->meta->version, addr, fst->data);
 }
-FstType fstGetType(Fst* fst) {
-  return fst->meta->ty;
-}
-CompiledAddr fstGetRootAddr(Fst* fst) {
-  return fst->meta->rootAddr;
-}
+FstType      fstGetType(Fst* fst) { return fst->meta->ty; }
+CompiledAddr fstGetRootAddr(Fst* fst) { return fst->meta->rootAddr; }
 
 Output fstEmptyFinalOutput(Fst* fst, bool* null) {
   Output   res = 0;
@@ -1053,8 +1066,7 @@ Output fstEmptyFinalOutput(Fst* fst, bool* null) {
 }
 
 bool fstVerify(Fst* fst) {
-  uint32_t checkSum = fst->meta->checkSum;
-  int32_t  len;
+  uint32_t len, checkSum = fst->meta->checkSum;
   uint8_t* data = fstSliceData(fst->data, &len);
   TSCKSUM  initSum = 0;
   if (!taosCheckChecksumWhole(data, len)) { return false; }
@@ -1094,15 +1106,12 @@ bool fstBoundWithDataIsEmpty(FstBoundWithData* bound) {
   }
 }
 
-bool fstBoundWithDataIsIncluded(FstBoundWithData* bound) {
-  return bound->type == Excluded ? false : true;
-}
+bool fstBoundWithDataIsIncluded(FstBoundWithData* bound) { return bound->type == Excluded ? false : true; }
 
-void fstBoundDestroy(FstBoundWithData* bound) {
-  free(bound);
-}
+void fstBoundDestroy(FstBoundWithData* bound) { free(bound); }
 
-StreamWithState* streamWithStateCreate(Fst* fst, AutomationCtx* automation, FstBoundWithData* min, FstBoundWithData* max) {
+StreamWithState* streamWithStateCreate(Fst* fst, AutomationCtx* automation, FstBoundWithData* min,
+                                       FstBoundWithData* max) {
   StreamWithState* sws = calloc(1, sizeof(StreamWithState));
   if (sws == NULL) { return NULL; }
 
@@ -1131,7 +1140,9 @@ void streamWithStateDestroy(StreamWithState* sws) {
 bool streamWithStateSeekMin(StreamWithState* sws, FstBoundWithData* min) {
   AutomationCtx* aut = sws->aut;
   if (fstBoundWithDataIsEmpty(min)) {
-    if (fstBoundWithDataIsIncluded(min)) { sws->emptyOutput.out = fstEmptyFinalOutput(sws->fst, &(sws->emptyOutput.null)); }
+    if (fstBoundWithDataIsIncluded(min)) {
+      sws->emptyOutput.out = fstEmptyFinalOutput(sws->fst, &(sws->emptyOutput.null));
+    }
     StreamState s = {.node = fstGetRoot(sws->fst),
                      .trans = 0,
                      .out = {.null = false, .out = 0},
@@ -1203,7 +1214,8 @@ bool streamWithStateSeekMin(StreamWithState* sws, FstBoundWithData* min) {
       uint64_t      trans = s->trans;
       FstTransition trn;
       fstNodeGetTransitionAt(n, trans - 1, &trn);
-      StreamState s = {.node = fstGetNode(sws->fst, trn.addr), .trans = 0, .out = {.null = false, .out = out}, .autState = autState};
+      StreamState s = {
+          .node = fstGetNode(sws->fst, trn.addr), .trans = 0, .out = {.null = false, .out = out}, .autState = autState};
       taosArrayPush(sws->stack, &s);
       return true;
     }
@@ -1260,9 +1272,7 @@ StreamWithStateResult* streamWithStateNextWith(StreamWithState* sws, StreamCallb
 
     size_t   isz = taosArrayGetSize(sws->inp);
     uint8_t* buf = (uint8_t*)malloc(isz * sizeof(uint8_t));
-    for (uint32_t i = 0; i < isz; i++) {
-      buf[i] = *(uint8_t*)taosArrayGet(sws->inp, i);
-    }
+    for (uint32_t i = 0; i < isz; i++) { buf[i] = *(uint8_t*)taosArrayGet(sws->inp, i); }
     FstSlice slice = fstSliceCreate(buf, taosArrayGetSize(sws->inp));
     if (fstBoundWithDataExceededBy(sws->endAt, &slice)) {
       taosArrayDestroyEx(sws->stack, streamStateDestroy);
@@ -1327,8 +1337,8 @@ FstStreamBuilder* fstStreamBuilderCreate(Fst* fst, AutomationCtx* aut) {
 }
 void fstStreamBuilderDestroy(FstStreamBuilder* b) {
   fstSliceDestroy(&b->min->data);
-  tfree(b->min);
   fstSliceDestroy(&b->max->data);
+  tfree(b->min);
   tfree(b->max);
   free(b);
 }
diff --git a/source/libs/index/src/index_fst_automation.c b/source/libs/index/src/index_fst_automation.c
index 590ff294bf8f1841fc27e4519df1d23f668adcd5..c6e3cee3e3b375fe283e7333e726a224b011c91c 100644
--- a/source/libs/index/src/index_fst_automation.c
+++ b/source/libs/index/src/index_fst_automation.c
@@ -17,9 +17,7 @@
 
 StartWithStateValue* startWithStateValueCreate(StartWithStateKind kind, ValueType ty, void* val) {
   StartWithStateValue* nsv = calloc(1, sizeof(StartWithStateValue));
-  if (nsv == NULL) {
-    return NULL;
-  }
+  if (nsv == NULL) { return NULL; }
 
   nsv->kind = kind;
   nsv->type = ty;
@@ -37,9 +35,7 @@ StartWithStateValue* startWithStateValueCreate(StartWithStateKind kind, ValueTyp
 }
 void startWithStateValueDestroy(void* val) {
   StartWithStateValue* sv = (StartWithStateValue*)val;
-  if (sv == NULL) {
-    return;
-  }
+  if (sv == NULL) { return; }
 
   if (sv->type == FST_INT) {
     //
@@ -52,9 +48,7 @@ void startWithStateValueDestroy(void* val) {
 }
 StartWithStateValue* startWithStateValueDump(StartWithStateValue* sv) {
   StartWithStateValue* nsv = calloc(1, sizeof(StartWithStateValue));
-  if (nsv == NULL) {
-    return NULL;
-  }
+  if (nsv == NULL) { return NULL; }
 
   nsv->kind = sv->kind;
   nsv->type = sv->type;
@@ -94,14 +88,10 @@ static bool prefixCanMatch(AutomationCtx* ctx, void* sv) {
 static bool  prefixWillAlwaysMatch(AutomationCtx* ctx, void* state) { return true; }
 static void* prefixAccept(AutomationCtx* ctx, void* state, uint8_t byte) {
   StartWithStateValue* ssv = (StartWithStateValue*)state;
-  if (ssv == NULL || ctx == NULL) {
-    return NULL;
-  }
+  if (ssv == NULL || ctx == NULL) { return NULL; }
 
   char* data = ctx->data;
-  if (ssv->kind == Done) {
-    return startWithStateValueCreate(Done, FST_INT, &ssv->val);
-  }
+  if (ssv->kind == Done) { return startWithStateValueCreate(Done, FST_INT, &ssv->val); }
   if ((strlen(data) > ssv->val) && data[ssv->val] == byte) {
     int val = ssv->val + 1;
 
@@ -138,9 +128,7 @@ AutomationFunc automFuncs[] = {
 
 AutomationCtx* automCtxCreate(void* data, AutomationType atype) {
   AutomationCtx* ctx = calloc(1, sizeof(AutomationCtx));
-  if (ctx == NULL) {
-    return NULL;
-  }
+  if (ctx == NULL) { return NULL; }
 
   StartWithStateValue* sv = NULL;
   if (atype == AUTOMATION_ALWAYS) {
diff --git a/source/libs/index/src/index_fst_counting_writer.c b/source/libs/index/src/index_fst_counting_writer.c
index 710db563d9e39ddea08832c03db6b0628afc2cc2..7906dfea111ae3bdab56a774abab0226305dd530 100644
--- a/source/libs/index/src/index_fst_counting_writer.c
+++ b/source/libs/index/src/index_fst_counting_writer.c
@@ -42,8 +42,8 @@ static int writeCtxDoRead(WriterCtx* ctx, uint8_t* buf, int len) {
 static int writeCtxDoReadFrom(WriterCtx* ctx, uint8_t* buf, int len, int32_t offset) {
   int nRead = 0;
   if (ctx->type == TFile) {
-    tfLseek(ctx->file.fd, offset, 0);
-    nRead = tfRead(ctx->file.fd, buf, len);
+    // tfLseek(ctx->file.fd, offset, 0);
+    nRead = tfPread(ctx->file.fd, buf, len, offset);
   } else {
     // refactor later
     assert(0);
@@ -52,6 +52,7 @@ static int writeCtxDoReadFrom(WriterCtx* ctx, uint8_t* buf, int len, int32_t off
 }
 static int writeCtxDoFlush(WriterCtx* ctx) {
   if (ctx->type == TFile) {
+    // taosFsyncFile(ctx->file.fd);
     tfFsync(ctx->file.fd);
     // tfFlush(ctx->file.fd);
   } else {
@@ -69,13 +70,15 @@ WriterCtx* writerCtxCreate(WriterType type, const char* path, bool readOnly, int
     // ugly code, refactor later
     ctx->file.readOnly = readOnly;
     if (readOnly == false) {
+      // ctx->file.fd = open(path, O_WRONLY | O_CREAT | O_APPEND, S_IRWXU | S_IRWXG | S_IRWXO);
       ctx->file.fd = tfOpenCreateWriteAppend(path);
     } else {
-      ctx->file.fd = tfOpenReadWrite(path);
+      // ctx->file.fd = open(path, O_RDONLY, S_IRWXU | S_IRWXG | S_IRWXO);
+      ctx->file.fd = tfOpenRead(path);
     }
     memcpy(ctx->file.buf, path, strlen(path));
     if (ctx->file.fd < 0) {
-      indexError("open file error %d", errno);
+      indexError("failed to open file, error %d", errno);
       goto END;
     }
   } else if (ctx->type == TMemory) {
@@ -101,10 +104,7 @@ void writerCtxDestroy(WriterCtx* ctx, bool remove) {
     free(ctx->mem.buf);
   } else {
     tfClose(ctx->file.fd);
-    if (remove) {
-      indexError("rm file %s", ctx->file.buf);
-      unlink(ctx->file.buf);
-    }
+    if (remove) { unlink(ctx->file.buf); }
   }
   free(ctx);
 }
@@ -144,7 +144,8 @@ int fstCountingWriterRead(FstCountingWriter* write, uint8_t* buf, uint32_t len)
 }
 
 uint32_t fstCountingWriterMaskedCheckSum(FstCountingWriter* write) { return 0; }
-int      fstCountingWriterFlush(FstCountingWriter* write) {
+
+int fstCountingWriterFlush(FstCountingWriter* write) {
   WriterCtx* ctx = write->wrt;
   ctx->flush(ctx);
   // write->wtr->flush
diff --git a/source/libs/index/src/index_tfile.c b/source/libs/index/src/index_tfile.c
index 17322e301e3b2227d610b7af45819d617b063a25..fc4f8593a105f5898fb977a8de0110bf83e5d6e5 100644
--- a/source/libs/index/src/index_tfile.c
+++ b/source/libs/index/src/index_tfile.c
@@ -53,13 +53,6 @@ static int  tfileParseFileName(const char* filename, uint64_t* suid, int* colId,
 static void tfileGenFileName(char* filename, uint64_t suid, int colId, int version);
 static void tfileSerialCacheKey(TFileCacheKey* key, char* buf);
 
-static TFileReader* tfileReaderCreateImpl(WriterCtx* ctx) {
-  TFileReader* reader = tfileReaderCreate(ctx);
-  tfileReaderRef(reader);
-  // tfileSerialCacheKey(&key, buf);
-  return reader;
-}
-
 TFileCache* tfileCacheCreate(const char* path) {
   TFileCache* tcache = calloc(1, sizeof(TFileCache));
   if (tcache == NULL) { return NULL; }
@@ -88,13 +81,16 @@ TFileCache* tfileCacheCreate(const char* path) {
     }
 
     char          buf[128] = {0};
-    TFileReader*  reader = tfileReaderCreateImpl(wc);
+    TFileReader*  reader = tfileReaderCreate(wc);
     TFileHeader*  header = &reader->header;
     TFileCacheKey key = {.suid = header->suid,
                          .colName = header->colName,
                          .nColName = strlen(header->colName),
                          .colType = header->colType};
     tfileSerialCacheKey(&key, buf);
+
+    tfileReaderRef(reader);
+    // indexTable
     taosHashPut(tcache->tableCache, buf, strlen(buf), &reader, sizeof(void*));
   }
   taosArrayDestroyEx(files, tfileDestroyFileName);
@@ -139,6 +135,7 @@ void tfileCachePut(TFileCache* tcache, TFileCacheKey* key, TFileReader* reader)
   if (p != NULL) {
     TFileReader* oldReader = *p;
     taosHashRemove(tcache->tableCache, buf, strlen(buf));
+    oldReader->remove = true;
     tfileReaderUnRef(oldReader);
   }
 
@@ -152,7 +149,6 @@ TFileReader* tfileReaderCreate(WriterCtx* ctx) {
 
   // T_REF_INC(reader);
   reader->ctx = ctx;
-
   if (0 != tfileReaderLoadHeader(reader)) {
     tfileReaderDestroy(reader);
     indexError("failed to load index header, suid: %" PRIu64 ", colName: %s", reader->header.suid,
@@ -172,7 +168,7 @@ void tfileReaderDestroy(TFileReader* reader) {
   if (reader == NULL) { return; }
   // T_REF_INC(reader);
   fstDestroy(reader->fst);
-  writerCtxDestroy(reader->ctx, true);
+  writerCtxDestroy(reader->ctx, reader->remove);
   free(reader);
 }
 
@@ -232,7 +228,7 @@ TFileReader* tfileReaderOpen(char* path, uint64_t suid, int32_t version, const c
   WriterCtx* wc = writerCtxCreate(TFile, fullname, true, 1024 * 1024 * 1024);
   if (wc == NULL) { return NULL; }
 
-  TFileReader* reader = tfileReaderCreateImpl(wc);
+  TFileReader* reader = tfileReaderCreate(wc);
   return reader;
 
   // tfileSerialCacheKey(&key, buf);
@@ -330,13 +326,16 @@ int tfileWriterPut(TFileWriter* tw, void* data, bool order) {
     return -1;
   }
   // write fst
+  indexError("--------Begin----------------");
   for (size_t i = 0; i < sz; i++) {
     // TODO, fst batch write later
     TFileValue* v = taosArrayGetP((SArray*)data, i);
     if (tfileWriteData(tw, v) == 0) {
       //
     }
+    indexError("data: %s, offset: %d len: %d", v->colVal, v->offset, (int)taosArrayGetSize(v->tableId));
   }
+  indexError("--------End----------------");
   fstBuilderFinish(tw->fb);
   fstBuilderDestroy(tw->fb);
   tw->fb = NULL;
@@ -360,7 +359,10 @@ IndexTFile* indexTFileCreate(const char* path) {
   tfile->cache = tfileCacheCreate(path);
   return tfile;
 }
-void IndexTFileDestroy(IndexTFile* tfile) { free(tfile); }
+void IndexTFileDestroy(IndexTFile* tfile) {
+  tfileCacheDestroy(tfile->cache);
+  free(tfile);
+}
 
 int indexTFileSearch(void* tfile, SIndexTermQuery* query, SArray* result) {
   int ret = -1;
@@ -539,8 +541,14 @@ static int tfileReaderLoadHeader(TFileReader* reader) {
   char buf[TFILE_HEADER_SIZE] = {0};
 
   int64_t nread = reader->ctx->readFrom(reader->ctx, buf, sizeof(buf), 0);
-  assert(nread == sizeof(buf));
+  if (nread == -1) {
+    //
+    indexError("actual Read: %d, to read: %d, errno: %d, filefd: %d, filename: %s", (int)(nread), (int)sizeof(buf),
+               errno, reader->ctx->file.fd, reader->ctx->file.buf);
+  }
+  // assert(nread == sizeof(buf));
   memcpy(&reader->header, buf, sizeof(buf));
+
   return 0;
 }
 static int tfileReaderLoadFst(TFileReader* reader) {
@@ -573,7 +581,7 @@ static int tfileReaderLoadTableIds(TFileReader* reader, int32_t offset, SArray*
   char*   buf = calloc(1, total);
   if (buf == NULL) { return -1; }
 
-  nread = ctx->read(ctx, buf, total);
+  nread = ctx->readFrom(ctx, buf, total, offset + sizeof(nid));
   assert(total == nread);
 
   for (int32_t i = 0; i < nid; i++) { taosArrayPush(result, (uint64_t*)buf + i); }
diff --git a/source/libs/index/test/fstTest.cc b/source/libs/index/test/fstTest.cc
index a4d8bb36f11c86b155c599c94bb8ce79c9466c5e..da974ce6c4be500370eefe4b112f507b5e7912e6 100644
--- a/source/libs/index/test/fstTest.cc
+++ b/source/libs/index/test/fstTest.cc
@@ -1,6 +1,7 @@
 
 #include <iostream>
 #include <string>
+#include <thread>
 #include <vector>
 #include "index.h"
 #include "indexInt.h"
@@ -42,7 +43,8 @@ class FstWriter {
 
 class FstReadMemory {
  public:
-  FstReadMemory(size_t size) {
+  FstReadMemory(size_t size, const std::string& fileName = fileName) {
+    tfInit();
     _wc = writerCtxCreate(TFile, fileName.c_str(), true, 64 * 1024);
     _w = fstCountingWriterCreate(_wc);
     _size = size;
@@ -101,6 +103,7 @@ class FstReadMemory {
     fstDestroy(_fst);
     fstSliceDestroy(&_s);
     writerCtxDestroy(_wc, false);
+    tfCleanup();
   }
 
  private:
@@ -165,8 +168,44 @@ void checkFstCheckIterator() {
   delete m;
   tfCleanup();
 }
-int main() {
-  checkFstCheckIterator();
+
+void fst_get(Fst* fst) {
+  for (int i = 0; i < 10000; i++) {
+    std::string term = "Hello";
+    FstSlice    key = fstSliceCreate((uint8_t*)term.c_str(), term.size());
+    uint64_t    offset = 0;
+    bool        ret = fstGet(fst, &key, &offset);
+    if (ret == false) {
+      std::cout << "not found" << std::endl;
+    } else {
+      std::cout << "found value:" << offset << std::endl;
+    }
+  }
+}
+
+#define NUM_OF_THREAD 10
+void validateTFile(char* arg) {
+  tfInit();
+
+  std::thread threads[NUM_OF_THREAD];
+  // std::vector<std::thread> threads;
+  TFileReader* reader = tfileReaderOpen(arg, 0, 295868, "tag1");
+
+  for (int i = 0; i < NUM_OF_THREAD; i++) {
+    threads[i] = std::thread(fst_get, reader->fst);
+    // threads.push_back(fst_get, reader->fst);
+    // std::thread t(fst_get, reader->fst);
+  }
+  for (int i = 0; i < NUM_OF_THREAD; i++) {
+    // wait join
+    threads[i].join();
+  }
+  tfCleanup();
+}
+int main(int argc, char* argv[]) {
+  if (argc > 1) { validateTFile(argv[1]); }
+  // checkFstCheckIterator();
   // checkFstPrefixSearch();
+
   return 1;
 }
diff --git a/source/libs/index/test/indexTests.cc b/source/libs/index/test/indexTests.cc
index 588205c67ff95b4a1836b37c17681b33f2fbd414..080becccf183cd374ed833895c02b1f5a949803f 100644
--- a/source/libs/index/test/indexTests.cc
+++ b/source/libs/index/test/indexTests.cc
@@ -15,6 +15,7 @@
 #include <gtest/gtest.h>
 #include <iostream>
 #include <string>
+#include <thread>
 #include "index.h"
 #include "indexInt.h"
 #include "index_cache.h"
@@ -25,6 +26,9 @@
 #include "tskiplist.h"
 #include "tutil.h"
 using namespace std;
+
+#define NUM_OF_THREAD 10
+
 class DebugInfo {
  public:
   DebugInfo(const char* str) : info(str) {
@@ -41,6 +45,7 @@ class DebugInfo {
  private:
   std::string info;
 };
+
 class FstWriter {
  public:
   FstWriter() {
@@ -332,6 +337,8 @@ class TFileObj {
   TFileObj(const std::string& path = "/tmp/tindex", const std::string& colName = "voltage")
       : path_(path), colName_(colName) {
     colId_ = 10;
+    reader_ = NULL;
+    writer_ = NULL;
     // Do Nothing
     //
   }
@@ -527,6 +534,7 @@ TEST_F(IndexCacheEnv, cache_test) {
     SIndexTerm* term = indexTermCreate(0, ADD_VALUE, TSDB_DATA_TYPE_BINARY, colName.c_str(), colName.size(),
                                        colVal.c_str(), colVal.size());
     coj->Put(term, colId, version++, suid++);
+    // indexTermDestry(term);
   }
   {
     std::string colVal("v3");
@@ -634,6 +642,23 @@ class IndexObj {
     indexMultiTermDestroy(terms);
     return numOfTable;
   }
+  int WriteMultiMillonData(const std::string& colName, const std::string& colVal = "Hello world",
+                           size_t numOfTable = 100 * 10000) {
+    std::string tColVal = colVal;
+    for (int i = 0; i < numOfTable; i++) {
+      tColVal[tColVal.size() - 1] = 'a' + i % 26;
+      SIndexTerm*      term = indexTermCreate(0, ADD_VALUE, TSDB_DATA_TYPE_BINARY, colName.c_str(), colName.size(),
+                                         colVal.c_str(), colVal.size());
+      SIndexMultiTerm* terms = indexMultiTermCreate();
+      indexMultiTermAdd(terms, term);
+      for (size_t i = 0; i < 10; i++) {
+        int ret = Put(terms, i);
+        assert(ret == 0);
+      }
+      indexMultiTermDestroy(terms);
+    }
+    return numOfTable;
+  }
 
   int Put(SIndexMultiTerm* fvs, uint64_t uid) {
     numOfWrite += taosArrayGetSize(fvs);
@@ -656,6 +681,14 @@ class IndexObj {
     return taosArrayGetSize(result);
     // assert(taosArrayGetSize(result) == targetSize);
   }
+  void PutOne(const std::string& colName, const std::string& colVal) {
+    SIndexTerm*      term = indexTermCreate(0, ADD_VALUE, TSDB_DATA_TYPE_BINARY, colName.c_str(), colName.size(),
+                                       colVal.c_str(), colVal.size());
+    SIndexMultiTerm* terms = indexMultiTermCreate();
+    indexMultiTermAdd(terms, term);
+    Put(terms, 10);
+    indexMultiTermDestroy(terms);
+  }
   void Debug() {
     std::cout << "numOfWrite:" << numOfWrite << std::endl;
     std::cout << "numOfRead:" << numOfRead << std::endl;
@@ -687,7 +720,7 @@ class IndexEnv2 : public ::testing::Test {
   IndexObj* index;
 };
 TEST_F(IndexEnv2, testIndexOpen) {
-  std::string path = "/tmp";
+  std::string path = "/tmp/test";
   if (index->Init(path) != 0) {
     std::cout << "failed to init index" << std::endl;
     exit(1);
@@ -723,10 +756,24 @@ TEST_F(IndexEnv2, testIndexOpen) {
     }
     indexMultiTermDestroy(terms);
   }
-
   {
+    size_t      size = 200;
     std::string colName("tag1"), colVal("Hello");
 
+    SIndexTerm*      term = indexTermCreate(0, ADD_VALUE, TSDB_DATA_TYPE_BINARY, colName.c_str(), colName.size(),
+                                       colVal.c_str(), colVal.size());
+    SIndexMultiTerm* terms = indexMultiTermCreate();
+    indexMultiTermAdd(terms, term);
+    for (size_t i = size * 3; i < size * 4; i++) {
+      int tableId = i;
+      int ret = index->Put(terms, tableId);
+      assert(ret == 0);
+    }
+    indexMultiTermDestroy(terms);
+  }
+
+  {
+    std::string           colName("tag1"), colVal("Hello");
     SIndexMultiTermQuery* mq = indexMultiTermQueryCreate(MUST);
     SIndexTerm*           term = indexTermCreate(0, ADD_VALUE, TSDB_DATA_TYPE_BINARY, colName.c_str(), colName.size(),
                                        colVal.c_str(), colVal.size());
@@ -735,21 +782,44 @@ TEST_F(IndexEnv2, testIndexOpen) {
     SArray* result = (SArray*)taosArrayInit(1, sizeof(uint64_t));
     index->Search(mq, result);
     std::cout << "target size: " << taosArrayGetSize(result) << std::endl;
-    // assert(taosArrayGetSize(result) == targetSize);
+    assert(taosArrayGetSize(result) == 400);
   }
 }
 
 TEST_F(IndexEnv2, testIndex_TrigeFlush) {
-  std::string path = "/tmp";
-  if (index->Init(path) != 0) {}
+  std::string path = "/tmp/test";
+  if (index->Init(path) != 0) {
+    // r
+    std::cout << "failed to init" << std::endl;
+  }
   int numOfTable = 100 * 10000;
-  index->WriteMillonData("tag1", "Hello world", numOfTable);
-  int target = index->SearchOne("tag1", "Hello world");
+  index->WriteMillonData("tag1", "Hello", numOfTable);
+  int target = index->SearchOne("tag1", "Hello");
   assert(numOfTable == target);
 }
+
+static void write_and_search(IndexObj* idx) {
+  std::string colName("tag1"), colVal("Hello");
+
+  int target = idx->SearchOne("tag1", "Hello");
+  idx->PutOne(colName, colVal);
+}
 TEST_F(IndexEnv2, testIndex_serarch_cache_and_tfile) {
-  std::string path = "/tmp";
-  if (index->Init(path) != 0) {}
+  std::string path = "/tmp/cache_and_tfile";
+  if (index->Init(path) != 0) {
+    // opt
+  }
+  index->WriteMultiMillonData("tag1", "Hello", 200000);
+  std::thread threads[NUM_OF_THREAD];
+
+  for (int i = 0; i < NUM_OF_THREAD; i++) {
+    //
+    threads[i] = std::thread(write_and_search, index);
+  }
+  for (int i = 0; i < NUM_OF_THREAD; i++) {
+    // TOD
+    threads[i].join();
+  }
 }
 TEST_F(IndexEnv2, testIndex_multi_thread_write) {
   std::string path = "/tmp";
@@ -769,4 +839,7 @@ TEST_F(IndexEnv2, testIndex_performance) {
   std::string path = "/tmp";
   if (index->Init(path) != 0) {}
 }
-TEST_F(IndexEnv2, testIndexMultiTag) {}
+TEST_F(IndexEnv2, testIndexMultiTag) {
+  std::string path = "/tmp";
+  if (index->Init(path) != 0) {}
+}
diff --git a/source/util/src/tfile.c b/source/util/src/tfile.c
index 313f1d97afbf3f60a253105dfcac23a91af131e9..4cb20802c78176b8cd6791f463ed8abeda3df7d7 100644
--- a/source/util/src/tfile.c
+++ b/source/util/src/tfile.c
@@ -16,21 +16,19 @@
 #define _DEFAULT_SOURCE
 #include "os.h"
 #include "taoserror.h"
-#include "ulog.h"
-#include "tutil.h"
 #include "tref.h"
+#include "tutil.h"
+#include "ulog.h"
 
 static int32_t tsFileRsetId = -1;
 
 static int8_t tfInited = 0;
 
-static void tfCloseFile(void *p) {
-  taosCloseFile((int32_t)(uintptr_t)p);
-}
+static void tfCloseFile(void *p) { taosCloseFile((int32_t)(uintptr_t)p); }
 
 int32_t tfInit() {
   int8_t old = atomic_val_compare_exchange_8(&tfInited, 0, 1);
-  if(old == 1) return 0;
+  if (old == 1) return 0;
   tsFileRsetId = taosOpenRef(2000, tfCloseFile);
   if (tsFileRsetId > 0) {
     return 0;
@@ -79,9 +77,7 @@ int64_t tfOpenCreateWriteAppend(const char *pathname, int32_t flags, mode_t mode
   return tfOpenImp(fd);
 }
 
-int64_t tfClose(int64_t tfd) {
-  return taosRemoveRef(tsFileRsetId, tfd);
-}
+int64_t tfClose(int64_t tfd) { return taosRemoveRef(tsFileRsetId, tfd); }
 
 int64_t tfWrite(int64_t tfd, void *buf, int64_t count) {
   void *p = taosAcquireRef(tsFileRsetId, tfd);
@@ -109,6 +105,19 @@ int64_t tfRead(int64_t tfd, void *buf, int64_t count) {
   return ret;
 }
 
+int64_t tfPread(int64_t tfd, void *buf, int64_t count, int32_t offset) {
+  void *p = taosAcquireRef(tsFileRsetId, tfd);
+  if (p == NULL) return -1;
+
+  int32_t fd = (int32_t)(uintptr_t)p;
+
+  int64_t ret = pread(fd, buf, count, offset);
+  if (ret < 0) terrno = TAOS_SYSTEM_ERROR(errno);
+
+  taosReleaseRef(tsFileRsetId, tfd);
+  return ret;
+}
+
 int32_t tfFsync(int64_t tfd) {
   void *p = taosAcquireRef(tsFileRsetId, tfd);
   if (p == NULL) return -1;