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https://issues.apache.org/jira/browse/KAFKA-16212?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17817795#comment-17817795
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Justine Olshan commented on KAFKA-16212:
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Thanks [~omnia_h_ibrahim] I remember this particularly being a tricky area for 
topic IDs, so I appreciate the time being spent here.

 

For fetch requests, I remember we had to do something similar to proposal 1 for 
the fetch path. When we receive fetch request < 13, we will have a zero topic 
ID stored. (Note – this is a placeholder and can not be used as a valid topic 
ID)


Does using the zero uuid make some of option 1 easier? Or are we already using 
the zero uuid to signify something?

> Cache partitions by TopicIdPartition instead of TopicPartition
> --------------------------------------------------------------
>
>                 Key: KAFKA-16212
>                 URL: https://issues.apache.org/jira/browse/KAFKA-16212
>             Project: Kafka
>          Issue Type: Improvement
>    Affects Versions: 3.7.0
>            Reporter: Gaurav Narula
>            Assignee: Omnia Ibrahim
>            Priority: Major
>
> From the discussion in [PR 
> 15263|https://github.com/apache/kafka/pull/15263#discussion_r1471075201], it 
> would be better to cache {{allPartitions}} by {{TopicIdPartition}} instead of 
> {{TopicPartition}} to avoid ambiguity.



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