from kazoo.client import KazooClient

config = {
    'consumer_group': '<%= @consumer_group %>',
    'topic': '<%= @topic %>'
}

def main():
    zk = KazooClient()
    zk.start()
    partitions = zk.get_children('/consumers/%(consumer_group)s/offsets/%(topic)s' % config)
    num_partitions = int(zk.get('/brokers/topics/%(topic)s/0' % config)[0])
    if len(partitions) != num_partitions:
        print "Croak! Partition fluctuation"
        return
    # and now go and connect to the broker and get the last offset available...

if __name__ == '__main__':
    main()