/** Read a {@link UserGroupInformation} from conf */
public static UserGroupInformation readFrom(Configuration conf) throws IOException {
try {
return UnixUserGroupInformation.readFromConf(
conf, UnixUserGroupInformation.UGI_PROPERTY_NAME);
} catch (LoginException e) {
throw (IOException) new IOException().initCause(e);
}
}
/** Login and return a UserGroupInformation object. */
public static UserGroupInformation login(Configuration conf) throws LoginException {
if (LOGIN_UGI == null) {
LOGIN_UGI = UnixUserGroupInformation.login(conf);
}
return LOGIN_UGI;
}