@Override
  public CommandProcessorResponse run(String command) throws CommandProcessorException {
    SessionState ss = SessionState.get();
    try {
      ss.loadReloadableAuxJars();
    } catch (IOException e) {
      LOG.error("fail to reload auxiliary jar files", e);
      throw new CommandProcessorException(e.getMessage(), e);
    }
    return new CommandProcessorResponse();
  }
used for reload auxiliary and jars without restarting hive server2
ql/src/java/org/apache/hadoop/hive/ql/processors/ReloadProcessor.java