mixing assign and subscribe for a group

[Ranjan, Shailesh (Contractor - CB - Front Office L, Group IT)]

Classification: Public

Hi All,

We have a kafka cluster where we are using consumer.subscribe() for a group id. 
We also are trying to write a simple monitoring tool running as a separate 
instance on a different host than the consumers for checking the consumer 
offsets and for that we have used below code which as I  understand is mixing 
assign and subscribe here.

I wanted to understand what problems/issues will happen if I have the below 
code where I have assigned a partition in to a new instance (which would have 
been assigned to a consumer, what happens to that consumers ownership of the 
partition?) belonging to the same group but not calling poll() but just getting 
the current position.

Code snippet:

try (KafkaConsumer<String, String> consumer = createConsumer(consumerGroup)) {
   TopicPartition topicPartition = new TopicPartition(topic, 
Integer.parseInt(partition));
   consumer.assign(Collections.singletonList(topicPartition));
   return consumer.position(topicPartition);
} catch (Exception ex) {
   log.error("Error occurres when try to get consumer group position");
   return -1;
}


Thanks,
Shailesh
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