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https://issues.apache.org/jira/browse/KAFKA-2035?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14389468#comment-14389468
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Jay Kreps commented on KAFKA-2035:
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Currently this is the log itself--Log.config always gives the latest config. I
think you are proposing Log.cache.config, but I'm not sure if I see the need
for two layers of indirection here.
> Add a topic config cache.
> -------------------------
>
> Key: KAFKA-2035
> URL: https://issues.apache.org/jira/browse/KAFKA-2035
> Project: Kafka
> Issue Type: Task
> Reporter: Parth Brahmbhatt
> Assignee: Parth Brahmbhatt
> Attachments: KAFKA-2035_2015-03-31_10:52:12.patch
>
>
> Currently the topic config is all about Log configuration so we have a
> TopicConfigManager which takes in a Log instance and keeps updating that
> instance's config instance as and when the topic config is updated. The topic
> config update notifications are sent using zk watchers by Controller.
> I propose to introduce a TopicConfigCache which will be updated by
> TopicConfigManager on any config changes. The log instance and any other
> component (like the authorizer mentioned in KAFKA-1688) will have a reference
> to TopicConfigCache using which they will access the topic configs.
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