return;
}
Configuration conf = new YarnConfiguration();
TimelineClient client = TimelineClient.createTimelineClient();
client.init(conf);
client.start();
try {
if (UserGroupInformation.isSecurityEnabled()
&& conf.getBoolean(YarnConfiguration.TIMELINE_SERVICE_ENABLED, false)) {
Token<TimelineDelegationTokenIdentifier> token =
client.getDelegationToken(