[jira] [Created] (KAFKA-20913) KafkaRaftClient#appendBatch reads a recycled batch buffer in its async commit callback, producing an incorrect appendTimestamp for committed batches

["Anjaneya Gupta (Jira)" <ji...@apache.org>]

Anjaneya Gupta created KAFKA-20913:
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             Summary: KafkaRaftClient#appendBatch reads a recycled batch buffer in its async commit callback, producing an incorrect appendTimestamp for committed batches
                 Key: KAFKA-20913
                 URL: https://issues.apache.org/jira/browse/KAFKA-20913
             Project: Kafka
          Issue Type: Bug
            Reporter: Anjaneya Gupta
            Assignee: Anjaneya Gupta


On the leader, KafkaRaftClient#appendBatch registers an asynchronous commit callback and then releases the batch's memory buffer back to the pool in a finally block. The callback runs later (once the batch commits) and reads CompletedBatch#appendTimestamp() out of that buffer. By then the buffer may have been reused by a newer batch, so the callback reads the newer batch's timestamp and delivers the wrong appendTimestamp to the commit listener.



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