[KAFKA-10074] Improve performance of `matchingAcls`

• Type: Improvement
• Status: Resolved
• Priority: Critical
• Resolution: Fixed
• Fix Version/s: 2.6.0
• Assignee: Ismael Juma
• Reporter: Ismael Juma
• Reviewer: Rajini Sivaram
• Created: 01/Jun/20 00:48
• Updated: 01/Jun/20 14:02
• Resolved: 01/Jun/20 14:02

Description

A recent change in `matchingAcls` to remove `filterKeys` in favor of filtering inside `flatMap` caused a performance regression in cases where there are large number of topics, prefix ACLs and TreeMap.from/to filtering is ineffective. In such cases, we rely on string comparisons to exclude entries from the ACL cache that are not relevant.

This issue is not present in any release yet, so we should include the simple fix in the 2.6 branch.

Issue Links

• links to: GitHub Pull Request #8769