[jira] [Created] (KAFKA-14224) Consumer should auto-commit prior to cooperative partition revocation

["Jason Gustafson (Jira)" <ji...@apache.org>]

Jason Gustafson created KAFKA-14224:
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             Summary: Consumer should auto-commit prior to cooperative partition revocation
                 Key: KAFKA-14224
                 URL: https://issues.apache.org/jira/browse/KAFKA-14224
             Project: Kafka
          Issue Type: Bug
            Reporter: Jason Gustafson


With the old "eager" reassignment logic, we always revoked all partitions prior to each rebalance. When auto-commit is enabled, a part of this process is committing current position. Under the cooperative logic, we defer revocation until after the rebalance, which means we can continue fetching while the rebalance is in progress. However, when reviewing KAFKA-14196, we noticed that there is no similar logic to commit offsets prior to this deferred revocation. This means that cooperative consumption is more likely to lead to have duplicate consumption even when there is no failure involved.



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