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https://issues.apache.org/jira/browse/KAFKA-16669?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Chia-Ping Tsai resolved KAFKA-16669.
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Fix Version/s: 3.9.0
Resolution: Fixed
> Remove extra collection copy when generating DescribeAclsResource
> -----------------------------------------------------------------
>
> Key: KAFKA-16669
> URL: https://issues.apache.org/jira/browse/KAFKA-16669
> Project: Kafka
> Issue Type: Improvement
> Reporter: Chia-Ping Tsai
> Assignee: Chia Chuan Yu
> Priority: Trivial
> Fix For: 3.9.0
>
>
> There are three collection copy happening in generating DescribeAclsResource
> 1. Iterable -> HashSet
> (https://github.com/apache/kafka/blob/25118cec145b1a70a7b1709ca4a7ac367f066c6c/core/src/main/scala/kafka/server/AclApis.scala#L72)
> 2. HashSet -> Map<R, List>
> (https://github.com/apache/kafka/blob/25118cec145b1a70a7b1709ca4a7ac367f066c6c/clients/src/main/java/org/apache/kafka/common/requests/DescribeAclsResponse.java#L141)
> 3. Map<R, List> -> List
> (https://github.com/apache/kafka/blob/25118cec145b1a70a7b1709ca4a7ac367f066c6c/clients/src/main/java/org/apache/kafka/common/requests/DescribeAclsResponse.java#L146)
> We can do two small optimization:
> 1. remove the first collection copy. This optimization needs two steps: a)
> change `aclsResources` input type from `Collection` to `Iterable`. b)
> de-duplicate in second collection copy: HashSet -> Map<R, List>. We use `Set`
> to replace the `List`
> 2. set the array size.
> https://github.com/apache/kafka/blob/25118cec145b1a70a7b1709ca4a7ac367f066c6c/clients/src/main/java/org/apache/kafka/common/requests/DescribeAclsResponse.java#L148
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