[CASSANDRA-19529] Latency regression on 4.1 comparing to 4.0

• Type: Bug
• Status: Resolved
• Priority: Normal
• Resolution: Not A Problem
• Fix Version/s: 4.1.x, 5.0.x, 5.x
• Component/s: Feature/Authorization
• Bug Category: Degradation - Performance Bug/Regression
• Severity: Normal
• Complexity: Normal
• Discovered By: Workload Replay
• Platform: All
• Since Version: 4.1-alpha1
• Assignee: Brandon Williams
• Reporter: Nicolas Henneaux

Authors

Brandon Williams

• Created: 04/Apr/24 18:38
• Updated: 11/Apr/24 14:39
• Resolved: 11/Apr/24 14:39

Description

When upgrading from Cassandra 4.0.10 to 4.1.3, I noticed an increase from application point of view latency from ~8ms to ~15ms when upgrading to Cassandra. The latency includes 3 simple queries (INSERT + SELECT (PK+CK) + UPDATE) plus application overhead.
It has been investigated in CASSANDRA-18766 to realize it is not related.
I tested to downgrade to 4.1alpha1 and the latency regression is still there with same value.

The version 4.1.4  has the same issue.

In a graph how it looks like