Small utility to get consumer lag from Kafka-stored consumer offsets.

There are 2 type of usage.

1. Using command line args:

   kafka-consumer-lag --brokers kafka01.home:6667,kafka02.home:6667 --topic topic_name --group-id consumer_group_id

The output of the command will be:

topic_name consumer_group_id 123

Where 123 is an aggregated lag.

1. Using stdin:

   echo "topic_name1 concumer_group_id1" >> tmp.txt
   echo "topic_name2 concumer_group_id2" >> tmp.txt
   cat tmp.txt | kafka-consumer-lag --brokers kafka01.home:6667,kafka02.home:6667

The output of the command will be:

topic_name1 consumer_group_id1 123
topic_name2 consumer_group_id2 321