Merge pull request #1531 from taosdata/feature/dnode

handle a reference counting bug

src/dnode/src/dnodeRead.c

@@ -291,7 +291,7 @@ static void dnodeProcessRetrieveMsg(void *pVnode, SReadMsg *pMsg) {
       dnodeContinueExecuteQuery(pVnode, pQInfo, pMsg);
     } else {  // no further execution invoked, release the ref to vnode
       dnodeProcessReadResult(pVnode, pMsg);
-      vnodeRelease(pVnode);
+      //vnodeRelease(pVnode);
     }
   }