Monitor the lag for the consumers that are assigned to partitions topic

[Spico Florin]

Hello!
   I'm working with Kafka 0.9.1 new consumer API.
The consumer is manually assigned to a partition. For this consumer I would
like to see its progress (meaning the lag).
Since I added the group id consumer-tutorial as property, I assumed that I
can use the command

bin/kafka-consumer-groups.sh --new-consumer --describe --group
consumer-tutorial-group --bootstrap-server localhost:9092
(as explained here
*http://www.confluent.io/blog/tutorial-getting-started-with-the-new-apache-kafka-0.9-consumer-client
<http://www.confluent.io/blog/tutorial-getting-started-with-the-new-apache-kafka-0.9-consumer-client>)*

Unfortunately, my group is not shown by the above command. Therefore I
cannot monitor the progress of my conusmer (its lag).



 How can I monitor the lag in the above described scenario (manually
assigned partition)?

I look forward for your answers.
Thanks,
 Florin

P.S. I'm using the below code for testing:




      Properties props = new Properties();
props.put("bootstrap.servers", "localhost:9092");
props.put("group.id", "consumer-tutorial");
props.put("key.deserializer", StringDeserializer.class.getName());
props.put("value.deserializer", StringDeserializer.class.getName());
KafkaConsumer<String, String> consumer = new KafkaConsumer<>(props);


        *String topic = "my-topic";*
*        TopicPartition topicPartition = new TopicPartition(topic, 0);*
*        consumer.assign(Arrays.asList(topicPartition));*
        consumer.seekToBeginning(topicPartition);
try {
  while (true) {
    ConsumerRecords<String, String> records = consumer.poll(1000);
    for (ConsumerRecord<String, String> record : records)
      System.out.println(record.offset() + ": " + record.value());
  consumer.commitSynch();
  }
} finally {
  consumer.close();
}