Jira server ASF JIRA serverId 5aa69414-a9e9-3523-82ec-879b028fb15b key KAFKA-4623 Jira server ASF JIRA serverId 5aa69414-a9e9-3523-82ec-879b028fb15b key KAFKA-5257
By default Kafka runs with the setting unclean.leader.election.enabled=true. This setting favours availability over durability by allowing an out of sync replica to become leader should there be no insync replica available. Many users run with the default settings. It is typically better to protect the data of those users by default, with the higher availability setting being something that can be enabled if required.