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https://issues.apache.org/jira/browse/KAFKA-19112?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17943826#comment-17943826
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Chia-Ping Tsai commented on KAFKA-19112:
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[~junrao] Leaving empty means users don't want to either delete or compact
segment files. It makes sense to me if users want to keep those data forever.
> cleanup.policy shouldn't be empty
> ---------------------------------
>
> Key: KAFKA-19112
> URL: https://issues.apache.org/jira/browse/KAFKA-19112
> Project: Kafka
> Issue Type: Bug
> Components: core
> Reporter: Jun Rao
> Assignee: 黃竣陽
> Priority: Major
>
> Currently, we allow a user to set cleanup.policy to be an empty list, which
> shouldn't be allowed. A few other configs of List type such as
> group.coordinator.rebalance.protocols and process.roles have the same
> problem.
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