Lianet Magrans created KAFKA-16786:
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             Summary: New consumer subscribe should not require the deprecated 
partition.assignment.strategy
                 Key: KAFKA-16786
                 URL: https://issues.apache.org/jira/browse/KAFKA-16786
             Project: Kafka
          Issue Type: Bug
          Components: consumer
    Affects Versions: 3.7.0
            Reporter: Lianet Magrans


The partition.assignment.strategy config is deprecated with the new consumer 
group protocol KIP-848. With the new protocol, server side assignors are 
supported for now, defined in the property
group.remote.assignor, and with default values selected by the broker, so it's 
not even a required property. 

The new AsyncKafkaConsumer supports the new protocol only, but it currently 
throws an IllegalStateException if a call to subscribe is made and the 
deprecated config partition.assignment.strategy is empty (see 
[throwIfNoAssignorsConfigured|https://github.com/apache/kafka/blob/056d232f4e28bf8e67e00f8ed2c103fdb0f3b78e/clients/src/main/java/org/apache/kafka/clients/consumer/internals/AsyncKafkaConsumer.java#L1715]).
 
We should remove the reference to ConsumerPartitionAssignor in the 
AsyncKafkaConsumer, along with it's validation for non-empty on subscribe (only 
use it has)



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