code: public void setSessionTimeout(int timeout) {
          ((ZKBackend) getBackend()).setSessionTimeout(timeout);
  
          if (LOG.isLoggable(Level.FINE)) {
              LOG.fine("Locator session timeout set to: " + timeout);
          }
      }
docs: Specify the time out of the session established at the server. The
  session is kept alive by requests sent by this client object. If the
  session is idle for a period of time that would timeout the session, the
  client will send a PING request to keep the session alive.
  
  @param timeout timeout in milliseconds, must be greater than zero and less
  than 60000.