@Override
  protected void adjustClientTimeoutIfNecessary(
      CnToDnAsyncRequestType CnToDnAsyncRequestType, AsyncDataNodeInternalServiceClient client) {
    if (CnToDnAsyncRequestType.SUBMIT_TEST_CONNECTION_TASK.equals(CnToDnAsyncRequestType)) {
      client.setTimeoutTemporarily(TestConnectionUtils.calculateCnLeaderToAllDnMaxTime());
    }
  }
Asynchronously send RPC requests to DataNodes. See queryengine.thrift for more details.
iotdb-core/confignode/src/main/java/org/apache/iotdb/confignode/client/async/CnToDnInternalServiceAsyncRequestManager.java