[jira] [Created] (KAFKA-14951) Changing the cleanup.policy on an existing topic from "delete" to "compact" seems to change it to "compact,delete" even though it says "compact"

["Tomasz Kaszuba (Jira)" <ji...@apache.org>]

Tomasz Kaszuba created KAFKA-14951:
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             Summary: Changing the cleanup.policy on an existing topic from "delete" to "compact" seems to change it to "compact,delete" even though it says "compact"
                 Key: KAFKA-14951
                 URL: https://issues.apache.org/jira/browse/KAFKA-14951
             Project: Kafka
          Issue Type: Bug
    Affects Versions: 2.8.2
            Reporter: Tomasz Kaszuba


We've seemed to have noticed something strange when we change the cleanup.policy of an existing topic from "delete" to "compact". It seems that even though the policy is set to "compact" the retention.ms is not ignored and the topic is still cleaned up when the retention time is hit, suggesting that the actual policy is "compact, delete" and not "compact". 

If this is the case could the metadata return "compact, delete" instead of "compact" when describing a topic?

I have not found any information if this is normal behavior but I noticed that this kind of change is blocked in the confluent cloud so perhaps this is a known issue.

[https://docs.confluent.io/cloud/current/clusters/broker-config.html#custom-topic-settings-for-all-cluster-types]

_You cannot change the {{cleanup.policy}} from {{delete}} to {{compact}} after a topic has been created_



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