Lianet Magrans created KAFKA-16107:
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             Summary: Ensure consumer does not start fetching from added 
partitions until onPartitionsAssgined completes
                 Key: KAFKA-16107
                 URL: https://issues.apache.org/jira/browse/KAFKA-16107
             Project: Kafka
          Issue Type: Sub-task
          Components: clients, consumer
            Reporter: Lianet Magrans


In the new consumer implementation, when new partitions are assigned, the 
subscription state is updated and then the #onPartitionsAssigned triggered. 
This sequence seems sensible but we need to ensure that no data is fetched 
until the onPartitionsAssigned completes (where the user could be setting the 
committed offsets it want to start fetching from).
We should pause the partitions newly added partitions until 
onPartitionsAssigned completes, similar to how it's done on revocation to avoid 
positions getting ahead of the committed offsets.



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