Using TLS1.3 (with JDK11) is causing a regression and an increase in inter-broker p99 latency, as mentioned by Yiming in Kafka-9320. We tested this with Kafka 2.8.
The issue seems to be because of a renegotiation exception being thrown by
This exception is causing the connection to close between the brokers before read/write is completed. In our internal experiments we have seen the p99 latency stabilize when we remove this exception.
Given that TLS1.3 does not support renegotiation, I would like to make it applicable just for TLS1.2.