Boyang Chen created KAFKA-9561:

             Summary: Update task input partitions when topic metadata changes
                 Key: KAFKA-9561
             Project: Kafka
          Issue Type: Improvement
          Components: streams
            Reporter: Boyang Chen

With, we exposed a possibility 
that a task could have been alive throughout the rebalance, while the input 
partitions actually change. For example, a regex subscribed source could have 
different topics when partitions are added/removed. We need to consider adding 
the support to expand/shrink the partitions across rebalance to keep task 
information consistent with subscription data.

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