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https://issues.apache.org/jira/browse/KAFKA-19112?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17942029#comment-17942029
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Jun Rao commented on KAFKA-19112:
---------------------------------
We can tighten up the validation for those configs. However, not sure about
incorrect values already in place. One option is to just fail fast in that
case. We probably need a KIP if we do that.
> 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
> 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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