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https://issues.apache.org/jira/browse/KAFKA-1961?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14324924#comment-14324924
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Jay Kreps commented on KAFKA-1961:
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Yeah I think since the cache would be totally out of sync it is basically an
error--you can't use this as a way to reset offsets. Let's just disable it in
the command line tool, that is probably good enough, right?
> Looks like its possible to delete _consumer_offsets topic
> ---------------------------------------------------------
>
> Key: KAFKA-1961
> URL: https://issues.apache.org/jira/browse/KAFKA-1961
> Project: Kafka
> Issue Type: Bug
> Affects Versions: 0.8.2.0
> Reporter: Gwen Shapira
> Labels: newbie
>
> Noticed that kafka-topics.sh --delete can successfully delete internal topics
> (__consumer_offsets).
> I'm pretty sure we want to prevent that, to avoid users shooting themselves
> in the foot.
> Topic admin command should check for internal topics, just like
> ReplicaManager does and not let users delete them.
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