fix checkpoint error

source/libs/stream/src/streamBackendRocksdb.c

@@ -826,6 +826,11 @@ int32_t streamBackendDoCheckpoint(void* arg, uint64_t checkpointId) {
   }
 
   qDebug("stream backend:%p start to do checkpoint at:%s, %d ", pHandle, checkpointDir, nCf);
+  if (taosIsDir(checkpointDir)) {
+    qInfo("stream rm exist checkpoint%s", checkpointDir);
+    taosRemoveFile(checkpointDir);
+  }
+
   if (pHandle->db != NULL) {
     char* err = NULL;
 
@@ -841,19 +846,18 @@ int32_t streamBackendDoCheckpoint(void* arg, uint64_t checkpointId) {
 
     rocksdb_checkpoint_t* cp = rocksdb_checkpoint_object_create(pHandle->db, &err);
     if (cp == NULL || err != NULL) {
-      qError("stream backend:%p failed to do checkpoint at:%s, reason:%s", pHandle, path, err);
+      qError("stream backend:%p failed to do checkpoint at:%s, reason:%s", pHandle, checkpointDir, err);
       taosMemoryFreeClear(err);
       code = -1;
       goto _ERROR;
     }
-
     rocksdb_checkpoint_create(cp, checkpointDir, 64 << 20, &err);
     if (err != NULL) {
-      qError("stream backend:%p failed to do checkpoint at:%s, reason:%s", pHandle, path, err);
+      qError("stream backend:%p failed to do checkpoint at:%s, reason:%s", pHandle, checkpointDir, err);
       taosMemoryFreeClear(err);
     } else {
       code = 0;
-      qDebug("stream backend:%p end to do checkpoint at:%s, time cost:%" PRId64 "ms", pHandle, path,
+      qDebug("stream backend:%p end to do checkpoint at:%s, time cost:%" PRId64 "ms", pHandle, checkpointDir,
              taosGetTimestampMs() - st);
     }
     rocksdb_checkpoint_object_destroy(cp);
@@ -863,9 +867,11 @@ int32_t streamBackendDoCheckpoint(void* arg, uint64_t checkpointId) {
     int64_t id = *(int64_t*)taosArrayGet(refs, i);
     taosReleaseRef(streamBackendCfWrapperId, id);
   }
-  taosWLockLatch(&pMeta->chkpDirLock);
-  taosArrayPush(pMeta->chkpSaved, &checkpointId);
-  taosWUnLockLatch(&pMeta->chkpDirLock);
+  if (code == 0) {
+    taosWLockLatch(&pMeta->chkpDirLock);
+    taosArrayPush(pMeta->chkpSaved, &checkpointId);
+    taosWUnLockLatch(&pMeta->chkpDirLock);
+  }
 
   taosArrayDestroy(refs);
   taosMemoryFree(ppCf);
@@ -874,8 +880,6 @@ int32_t streamBackendDoCheckpoint(void* arg, uint64_t checkpointId) {
 
 _ERROR:
   taosReleaseRef(streamBackendId, backendRid);
-  taosArrayDestroy(refs);
-  taosMemoryFree(ppCf);
   return code;
 }