[CASSANDRA-16522] ClientRequestSizeMetricsTest is flaky

• Type: Bug
• Status: Resolved
• Priority: Normal
• Resolution: Fixed
• Fix Version/s: 4.0-rc1, 4.0
• Component/s: Test/unit
• Bug Category: Code
• Severity: Low
• Complexity: Low Hanging Fruit
• Discovered By: Unit Test
• Platform: All
• Since Version: 4.0-beta3

Source Control Link

https://github.com/apache/cassandra/commit/ecc7c2fc393568076c30243b48a26045d61d03f3

Test and Documentation Plan

run unit tests

• Assignee: Jacek Lewandowski
• Reporter: Jacek Lewandowski

Authors

Jacek Lewandowski

Reviewers

Andres de la Peña, Benjamin Lerer, Jeremiah Jordan, Michael Semb Wever

• Created: 15/Mar/21 12:33
• Updated: 19/Nov/21 06:48
• Resolved: 16/Mar/21 20:49

Description

I don't know if it was reported but we can see it fail sometimes.

The reason is that it checks the metrics before issuing and query and after. It expects that the executed operation between subsequent metrics checks is the only operation during that time. However the driver sometimes may refresh the schema in the middle and pollute the results. It is perfectly enough to slow down the execution a bit and the test starts to fail consistently rather than sporadically because we always hit schema refresh.

Patch at https://github.com/apache/cassandra/pull/930