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Discussion thread: here

Jira: 

Jira
serverASF JIRA
serverId5aa69414-a9e9-3523-82ec-879b028fb15b
keyKAFKA-5257

Motivation

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.

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