Producer exception handling with required.ack = -1

Hi All,

Just want to double check with you regarding producers using required.acks
= -1.

- Producer is guaranteed to receive responses within certain time.
Because the satisfied request checking is for in-sync replica. If some
replica got stuck, it will be removed from in-sync replica and hence won't
block sending response back.

- All exceptions in response come from the leader replica, which means
appending to the leader failed and producer should resend the message.

- Potential data loss case: when broker does unclean-leader election

- Potential data duplication case: connection dropped before producer
receives response. In which case, producer does not know whether the
request succeeded or resend the message.

Are those above correct? Thank you for your time.