Hello Apache Kafka community, I'm trying to use new producer, from kafka-clients 0.8.2.2, together with simple consumer to fetch and commit offsets stored in Kafka, and I'm seeing strange behavior - a committed offset/message gets read multiple times, offset fetch requests do not always see committed offsets as committed, likelihood of message being read and committed multiple times seems to increase with higher load.
Before trying to use new producer, I was using old one, sync mode, and same consumer code with fetch/commit offsets stored in Kafka - all was well, offsets/messages once committed were never read again. To get equivalent behavior, old sync producer guarnatees, but with benefits of batching multiple produce request together I'm trying to use new producer batch async support, while blocking produce until response is received or produce fails, waiting for all ISRs. Is this a (known) bug or is it by design? Kind regards, Stevo Slavic.
