diff --git a/include/common/tglobal.h b/include/common/tglobal.h
index 2d4d437649..bece14c17d 100644
--- a/include/common/tglobal.h
+++ b/include/common/tglobal.h
@@ -94,6 +94,7 @@ extern int32_t tsElectInterval;
 extern int32_t tsHeartbeatInterval;
 extern int32_t tsHeartbeatTimeout;
 extern int32_t tsSnapReplMaxWaitN;
+extern int64_t tsLogBufferMemoryAllowed;  // maximum allowed log buffer size in bytes for each dnode
 
 // arbitrator
 extern int32_t tsArbHeartBeatIntervalSec;
diff --git a/include/util/tdef.h b/include/util/tdef.h
index 46a0d01457..46c84ab26a 100644
--- a/include/util/tdef.h
+++ b/include/util/tdef.h
@@ -332,6 +332,7 @@ typedef enum ELogicConditionType {
 #define TSDB_MAX_LEARNER_REPLICA       10
 #define TSDB_SYNC_LOG_BUFFER_SIZE      4096
 #define TSDB_SYNC_LOG_BUFFER_RETENTION 256
+#define TSDB_SYNC_LOG_BUFFER_THRESHOLD (1024 * 1024 * 5)
 #define TSDB_SYNC_APPLYQ_SIZE_LIMIT    512
 #define TSDB_SYNC_NEGOTIATION_WIN      512
 
diff --git a/source/common/src/tglobal.c b/source/common/src/tglobal.c
index 5b67e1267b..2519ead06e 100644
--- a/source/common/src/tglobal.c
+++ b/source/common/src/tglobal.c
@@ -81,6 +81,7 @@ int32_t tsElectInterval = 25 * 1000;
 int32_t tsHeartbeatInterval = 1000;
 int32_t tsHeartbeatTimeout = 20 * 1000;
 int32_t tsSnapReplMaxWaitN = 128;
+int64_t tsLogBufferMemoryAllowed = 0;  // bytes
 
 // mnode
 int64_t tsMndSdbWriteDelta = 200;
@@ -702,6 +703,9 @@ static int32_t taosAddServerCfg(SConfig *pCfg) {
   tsQueueMemoryAllowed = tsTotalMemoryKB * 1024 * 0.1;
   tsQueueMemoryAllowed = TRANGE(tsQueueMemoryAllowed, TSDB_MAX_MSG_SIZE * 10LL, TSDB_MAX_MSG_SIZE * 10000LL);
 
+  tsLogBufferMemoryAllowed = tsTotalMemoryKB * 1024 * 0.1;
+  tsLogBufferMemoryAllowed = TRANGE(tsLogBufferMemoryAllowed, TSDB_MAX_MSG_SIZE * 10LL, TSDB_MAX_MSG_SIZE * 10000LL);
+
   // clang-format off
   TAOS_CHECK_RETURN(cfgAddDir(pCfg, "dataDir", tsDataDir, CFG_SCOPE_SERVER, CFG_DYN_NONE));
   TAOS_CHECK_RETURN(cfgAddFloat(pCfg, "minimalDataDirGB", 2.0f, 0.001f, 10000000, CFG_SCOPE_SERVER, CFG_DYN_NONE));
@@ -736,6 +740,7 @@ static int32_t taosAddServerCfg(SConfig *pCfg) {
   TAOS_CHECK_RETURN(cfgAddInt32(pCfg, "syncHeartbeatInterval", tsHeartbeatInterval, 10, 1000 * 60 * 24 * 2, CFG_SCOPE_SERVER, CFG_DYN_NONE));
   TAOS_CHECK_RETURN(cfgAddInt32(pCfg, "syncHeartbeatTimeout", tsHeartbeatTimeout, 10, 1000 * 60 * 24 * 2, CFG_SCOPE_SERVER, CFG_DYN_NONE));
   TAOS_CHECK_RETURN(cfgAddInt32(pCfg, "syncSnapReplMaxWaitN", tsSnapReplMaxWaitN, 16, (TSDB_SYNC_SNAP_BUFFER_SIZE >> 2), CFG_SCOPE_SERVER, CFG_DYN_NONE));
+  TAOS_CHECK_RETURN(cfgAddInt64(pCfg, "syncLogBufferMemoryAllowed", tsLogBufferMemoryAllowed, TSDB_MAX_MSG_SIZE * 10L, INT64_MAX, CFG_SCOPE_SERVER, CFG_DYN_ENT_SERVER));
 
   TAOS_CHECK_RETURN(cfgAddInt32(pCfg, "arbHeartBeatIntervalSec", tsArbHeartBeatIntervalSec, 1, 60 * 24 * 2, CFG_SCOPE_SERVER, CFG_DYN_NONE));
   TAOS_CHECK_RETURN(cfgAddInt32(pCfg, "arbCheckSyncIntervalSec", tsArbCheckSyncIntervalSec, 1, 60 * 24 * 2, CFG_SCOPE_SERVER, CFG_DYN_NONE));
@@ -970,6 +975,14 @@ static int32_t taosUpdateServerCfg(SConfig *pCfg) {
     pItem->stype = stype;
   }
 
+  pItem = cfgGetItem(tsCfg, "syncLogBufferMemoryAllowed");
+  if (pItem != NULL && pItem->stype == CFG_STYPE_DEFAULT) {
+    tsLogBufferMemoryAllowed = totalMemoryKB * 1024 * 0.1;
+    tsLogBufferMemoryAllowed = TRANGE(tsLogBufferMemoryAllowed, TSDB_MAX_MSG_SIZE * 10LL, TSDB_MAX_MSG_SIZE * 10000LL);
+    pItem->i64 = tsLogBufferMemoryAllowed;
+    pItem->stype = stype;
+  }
+
   TAOS_RETURN(TSDB_CODE_SUCCESS);
 }
 
@@ -1520,6 +1533,9 @@ static int32_t taosSetServerCfg(SConfig *pCfg) {
   TAOS_CHECK_GET_CFG_ITEM(pCfg, pItem, "syncSnapReplMaxWaitN");
   tsSnapReplMaxWaitN = pItem->i32;
 
+  TAOS_CHECK_GET_CFG_ITEM(pCfg, pItem, "syncLogBufferMemoryAllowed");
+  tsLogBufferMemoryAllowed = pItem->i64;
+
   TAOS_CHECK_GET_CFG_ITEM(pCfg, pItem, "arbHeartBeatIntervalSec");
   tsArbHeartBeatIntervalSec = pItem->i32;
 
@@ -1954,6 +1970,7 @@ static int32_t taosCfgDynamicOptionsForServer(SConfig *pCfg, const char *name) {
                                          {"randErrorChance", &tsRandErrChance},
                                          {"randErrorDivisor", &tsRandErrDivisor},
                                          {"randErrorScope", &tsRandErrScope},
+                                         {"syncLogBufferMemoryAllowed", &tsLogBufferMemoryAllowed},
 
                                          {"cacheLazyLoadThreshold", &tsCacheLazyLoadThreshold},
                                          {"checkpointInterval", &tsStreamCheckpointInterval},
diff --git a/source/libs/sync/inc/syncInt.h b/source/libs/sync/inc/syncInt.h
index 009854b45b..0b653ddbe9 100644
--- a/source/libs/sync/inc/syncInt.h
+++ b/source/libs/sync/inc/syncInt.h
@@ -21,7 +21,7 @@ extern "C" {
 #endif
 
 #include "sync.h"
-#include "taosdef.h"
+#include "tglobal.h"
 #include "trpc.h"
 #include "ttimer.h"
 
diff --git a/source/libs/sync/inc/syncPipeline.h b/source/libs/sync/inc/syncPipeline.h
index ea85b796d5..427a3690f2 100644
--- a/source/libs/sync/inc/syncPipeline.h
+++ b/source/libs/sync/inc/syncPipeline.h
@@ -54,6 +54,7 @@ typedef struct SSyncLogBuffer {
   int64_t          matchIndex;
   int64_t          endIndex;
   int64_t          size;
+  int64_t          bytes;
   TdThreadMutex    mutex;
   TdThreadMutexAttr attr;
   int64_t          totalIndex;
diff --git a/source/libs/sync/src/syncPipeline.c b/source/libs/sync/src/syncPipeline.c
index 86d4d83d29..d042bf8ade 100644
--- a/source/libs/sync/src/syncPipeline.c
+++ b/source/libs/sync/src/syncPipeline.c
@@ -28,6 +28,8 @@
 #include "syncUtil.h"
 #include "syncVoteMgr.h"
 
+static int64_t tsLogBufferMemoryUsed = 0;  // total bytes of vnode log buffer
+
 static bool syncIsMsgBlock(tmsg_t type) {
   return (type == TDMT_VND_CREATE_TABLE) || (type == TDMT_VND_ALTER_TABLE) || (type == TDMT_VND_DROP_TABLE) ||
          (type == TDMT_VND_UPDATE_TAG_VAL) || (type == TDMT_VND_ALTER_CONFIRM);
@@ -101,6 +103,10 @@ int32_t syncLogBufferAppend(SSyncLogBuffer* pBuf, SSyncNode* pNode, SSyncRaftEnt
   SSyncLogBufEntry tmp = {.pItem = pEntry, .prevLogIndex = pMatch->index, .prevLogTerm = pMatch->term};
   pBuf->entries[index % pBuf->size] = tmp;
   pBuf->endIndex = index + 1;
+  if (pNode->vgId > 1) {
+    pBuf->bytes += pEntry->bytes;
+    (void)atomic_add_fetch_64(&tsLogBufferMemoryUsed, (int64_t)pEntry->bytes);
+  }
 
   (void)taosThreadMutexUnlock(&pBuf->mutex);
   TAOS_CHECK_RETURN(syncLogBufferValidate(pBuf));
@@ -260,6 +266,10 @@ int32_t syncLogBufferInitWithoutLock(SSyncLogBuffer* pBuf, SSyncNode* pNode) {
       SSyncLogBufEntry tmp = {.pItem = pEntry, .prevLogIndex = -1, .prevLogTerm = -1};
       pBuf->entries[index % pBuf->size] = tmp;
       taken = true;
+      if (pNode->vgId > 1) {
+        pBuf->bytes += pEntry->bytes;
+        (void)atomic_add_fetch_64(&tsLogBufferMemoryUsed, (int64_t)pEntry->bytes);
+      }
     }
 
     if (index < toIndex) {
@@ -286,6 +296,10 @@ int32_t syncLogBufferInitWithoutLock(SSyncLogBuffer* pBuf, SSyncNode* pNode) {
     }
     SSyncLogBufEntry tmp = {.pItem = pDummy, .prevLogIndex = commitIndex - 1, .prevLogTerm = commitTerm};
     pBuf->entries[(commitIndex + pBuf->size) % pBuf->size] = tmp;
+    if (pNode->vgId > 1) {
+      pBuf->bytes += pDummy->bytes;
+      (void)atomic_add_fetch_64(&tsLogBufferMemoryUsed, (int64_t)pDummy->bytes);
+    }
 
     if (index < toIndex) {
       pBuf->entries[(index + 1) % pBuf->size].prevLogIndex = commitIndex;
@@ -330,6 +344,7 @@ int32_t syncLogBufferReInit(SSyncLogBuffer* pBuf, SSyncNode* pNode) {
     (void)memset(&pBuf->entries[(index + pBuf->size) % pBuf->size], 0, sizeof(pBuf->entries[0]));
   }
   pBuf->startIndex = pBuf->commitIndex = pBuf->matchIndex = pBuf->endIndex = 0;
+  pBuf->bytes = 0;
   int32_t code = syncLogBufferInitWithoutLock(pBuf, pNode);
   if (code < 0) {
     sError("vgId:%d, failed to re-initialize sync log buffer since %s.", pNode->vgId, tstrerror(code));
@@ -470,8 +485,12 @@ int32_t syncLogBufferAccept(SSyncLogBuffer* pBuf, SSyncNode* pNode, SSyncRaftEnt
     goto _out;
   }
   SSyncLogBufEntry tmp = {.pItem = pEntry, .prevLogIndex = prevIndex, .prevLogTerm = prevTerm};
-  pEntry = NULL;
   pBuf->entries[index % pBuf->size] = tmp;
+  if (pNode->vgId > 1) {
+    pBuf->bytes += pEntry->bytes;
+    (void)atomic_add_fetch_64(&tsLogBufferMemoryUsed, (int64_t)pEntry->bytes);
+  }
+  pEntry = NULL;
 
   // update end index
   pBuf->endIndex = TMAX(index + 1, pBuf->endIndex);
@@ -846,14 +865,34 @@ int32_t syncLogBufferCommit(SSyncLogBuffer* pBuf, SSyncNode* pNode, int64_t comm
   }
 
   // recycle
+  bool      isVnode = pNode->vgId > 1;
   SyncIndex until = pBuf->commitIndex - TSDB_SYNC_LOG_BUFFER_RETENTION;
-  for (SyncIndex index = pBuf->startIndex; index < until; index++) {
-    SSyncRaftEntry* pEntry = pBuf->entries[(index + pBuf->size) % pBuf->size].pItem;
-    if (pEntry == NULL) return TSDB_CODE_SYN_INTERNAL_ERROR;
+  do {
+    if ((pBuf->startIndex >= pBuf->commitIndex) ||
+        !((pBuf->startIndex < until) || (isVnode && pBuf->bytes >= TSDB_SYNC_LOG_BUFFER_THRESHOLD &&
+                                         atomic_load_64(&tsLogBufferMemoryUsed) >= tsLogBufferMemoryAllowed))) {
+      break;
+    }
+    SSyncRaftEntry* pEntry = pBuf->entries[(pBuf->startIndex + pBuf->size) % pBuf->size].pItem;
+    if (pEntry == NULL) {
+      sError("vgId:%d, invalid log entry to recycle. index:%" PRId64 ", startIndex:%" PRId64 ", until:%" PRId64
+             ", commitIndex:%" PRId64 ", endIndex:%" PRId64 ", term:%" PRId64,
+             pNode->vgId, pEntry->index, pBuf->startIndex, until, pBuf->commitIndex, pBuf->endIndex, pEntry->term);
+      return TSDB_CODE_SYN_INTERNAL_ERROR;
+    }
+    if (isVnode) {
+      pBuf->bytes -= pEntry->bytes;
+      (void)atomic_sub_fetch_64(&tsLogBufferMemoryUsed, (int64_t)pEntry->bytes);
+    }
+    sDebug("vgId:%d, recycle log entry. index:%" PRId64 ", startIndex:%" PRId64 ", until:%" PRId64
+           ", commitIndex:%" PRId64 ", endIndex:%" PRId64 ", term:%" PRId64 ", entry bytes:%u, buf bytes:%" PRId64
+           ", used:%" PRId64 ", allowed:%" PRId64,
+           pNode->vgId, pEntry->index, pBuf->startIndex, until, pBuf->commitIndex, pBuf->endIndex, pEntry->term,
+           pEntry->bytes, pBuf->bytes, atomic_load_64(&tsLogBufferMemoryUsed), tsLogBufferMemoryAllowed);
     syncEntryDestroy(pEntry);
-    (void)memset(&pBuf->entries[(index + pBuf->size) % pBuf->size], 0, sizeof(pBuf->entries[0]));
-    pBuf->startIndex = index + 1;
-  }
+    (void)memset(&pBuf->entries[(pBuf->startIndex + pBuf->size) % pBuf->size], 0, sizeof(pBuf->entries[0]));
+    ++pBuf->startIndex;
+  } while (true);
 
   code = 0;
 _out:
@@ -1324,6 +1363,7 @@ void syncLogBufferClear(SSyncLogBuffer* pBuf) {
     (void)memset(&pBuf->entries[(index + pBuf->size) % pBuf->size], 0, sizeof(pBuf->entries[0]));
   }
   pBuf->startIndex = pBuf->commitIndex = pBuf->matchIndex = pBuf->endIndex = 0;
+  pBuf->bytes = 0;
   (void)taosThreadMutexUnlock(&pBuf->mutex);
 }