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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