code: @Deprecated
    public static FileSystem getProxiedFileSystemUsingKeytab(State state, URI fsURI, Configuration conf)
        throws ExecutionException {
      Preconditions.checkArgument(state.contains(ConfigurationKeys.FS_PROXY_AS_USER_NAME));
      Preconditions.checkArgument(state.contains(ConfigurationKeys.SUPER_USER_NAME_TO_PROXY_AS_OTHERS));
      Preconditions.checkArgument(state.contains(ConfigurationKeys.SUPER_USER_KEY_TAB_LOCATION));
  
      return getProxiedFileSystemUsingKeytab(state.getProp(ConfigurationKeys.FS_PROXY_AS_USER_NAME),
          state.getProp(ConfigurationKeys.SUPER_USER_NAME_TO_PROXY_AS_OTHERS),
          new Path(state.getProp(ConfigurationKeys.SUPER_USER_KEY_TAB_LOCATION)), fsURI, conf);
    }
docs: Cached version of {@link ProxiedFileSystemUtils#createProxiedFileSystemUsingKeytab(State, URI, Configuration)}.
  @deprecated use {@link #fromKeytab}.