jack2012aa opened a new pull request, #22628:
URL: https://github.com/apache/kafka/pull/22628

   # Description
   In PR #21215 we found out that setting batch size to zero not necessarily 
disable the batching behavior. Producer needs one to two more records to 
perform send. 
   
   `RecordAccumulator` uses an estimated size to allocate the buffer for the 
batch. The size is actually larger than two records. This is probably the 
reason of the behavior.
   
   # Tests
   `RecordAccumulatorTest#testBatchSizeZero` shows that the real batch size is 
larger than two records.
   
   `KafkaProducerTest#testBatchSizeZero` shows that only after trying to send 
the third record the first two records are sent.


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