Merge pull request #8968 from taosdata/hotfix/TS-787

Hotfix/ts 787: release lock during write socket

src/sync/src/syncMain.c

@@ -1502,7 +1502,10 @@ static int32_t syncForwardToPeerImpl(SSyncNode *pNode, void *data, void *mhandle
       }
     }
 
-    int32_t retLen = taosWriteMsg(pPeer->peerFd, pSyncHead, fwdLen);
+    SOCKET peerFd = pPeer->peerFd;
+    pthread_mutex_unlock(&pNode->mutex);
+    int32_t retLen = taosWriteMsg(peerFd, pSyncHead, fwdLen);
+    pthread_mutex_lock(&pNode->mutex);
     if (retLen == fwdLen) {
       sTrace("%s, forward is sent, role:%s sstatus:%s hver:%" PRIu64 " contLen:%d", pPeer->id, syncRole[pPeer->role],
              syncStatus[pPeer->sstatus], pWalHead->version, pWalHead->len);