How to get latest offset for a partition for a kafka topic?
<p>I am using the Python high level consumer for Kafka and want to know the latest offsets for each partition of a topic. However I cannot get it to work. </p>

<pre><code>from kafka import TopicPartition
from kafka.consumer import KafkaConsumer

con = KafkaConsumer(bootstrap_servers = brokers)
ps = [TopicPartition(topic, p) for p in con.partitions_for_topic(topic)]

con.assign(ps)
for p in ps:
    print "For partition %s highwater is %s"%(p.partition,con.highwater(p))

print "Subscription = %s"%con.subscription()
print "con.seek_to_beginning() = %s"%con.seek_to_beginning()
</code></pre>

<p>But the output I get is </p>

<pre><code>For partition 0 highwater is None
For partition 1 highwater is None
For partition 2 highwater is None
For partition 3 highwater is None
For partition 4 highwater is None
For partition 5 highwater is None
....
For partition 96 highwater is None
For partition 97 highwater is None
For partition 98 highwater is None
For partition 99 highwater is None
Subscription = None
con.seek_to_beginning() = None
con.seek_to_end() = None
</code></pre>

<p>I have an alternate approach using <code>assign</code> but the result is the same</p>

<pre><code>con = KafkaConsumer(bootstrap_servers = brokers)
ps = [TopicPartition(topic, p) for p in con.partitions_for_topic(topic)]

con.assign(ps)
for p in ps:
    print "For partition %s highwater is %s"%(p.partition,con.highwater(p))

print "Subscription = %s"%con.subscription()
print "con.seek_to_beginning() = %s"%con.seek_to_beginning()
print "con.seek_to_end() = %s"%con.seek_to_end()
</code></pre>

<p>It seems from some of the documentation that I might get this behaviour if a <code>fetch</code> has not been issued. But I cannot find a way to force that. What am I doing wrong?</p>

<p>Or is there a different/simpler way to get the latest offsets for a topic?</p>