code: private void reconnect(Exception reconnectEx) {
          // Log the exception as a warning.
          m_logger.warn("Reconnecting to Cassandra due to error", reconnectEx);
          
          // Reconnect up to the configured number of times, waiting a little between each attempt.
          boolean bSuccess = false;
          for (int attempt = 1; !bSuccess; attempt++) {
              try {
                  close();
                  m_dbService.connectDBConn(this);
                  m_logger.debug("Reconnect successful");
                  bSuccess = true;
              } catch (Exception ex) {
                  // Abort if all retries failed.
                  if (attempt >= m_max_reconnect_attempts) {
                      m_logger.error("All reconnect attempts failed; abandoning reconnect", ex);
                      throw new DBNotAvailableException("All reconnect attempts failed", ex);
                  }
                  m_logger.warn("Reconnect attempt #" + attempt + " failed", ex);
                  try {
                      Thread.sleep(m_retry_wait_millis * attempt);
                  } catch (InterruptedException e) {
                      // Ignore
                  }
              }
          }
      }
docs: an DBNotAvailableException and leave the Thrift connection null.