[CASSANDRA-15394] Remove list iterators

• Type: Sub-task
• Status: Resolved
• Priority: Normal
• Resolution: Fixed
• Fix Version/s: 4.0, 4.0-alpha4
• Component/s: Local/Compaction
• Change Category: Performance
• Complexity: Low Hanging Fruit
• Platform: All

Source Control Link

https://github.com/apache/cassandra/commit/543bbdd9b630a77cff40cc266b427946688805ed

Test and Documentation Plan

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• Assignee: Blake Eggleston
• Reporter: Blake Eggleston

Authors

Blake Eggleston

Reviewers

Benedict Elliott Smith

• Created: 30/Oct/19 22:51
• Updated: 15/May/20 08:42
• Resolved: 11/Apr/20 00:58

Description

We allocate list iterators in several places in hot paths. This converts them to get by index. This provides a ~4% improvement in relvant workloads.