[CASSANDRA-18921] Describe statement may include inconsistent schema and schema version for paging

• Type: Bug
• Status: Resolved
• Priority: Normal
• Resolution: Fixed
• Fix Version/s: 4.0.12, 4.1.4, 5.0-beta1, 5.0, 5.1
• Component/s: Cluster/Schema
• Bug Category: Correctness - Consistency
• Severity: Low
• Complexity: Low Hanging Fruit
• Discovered By: Code Inspection
• Platform: All
• Since Version: 4.0.0

Source Control Link

https://github.com/apache/cassandra/commit/86e07595f744eb2a250cf6c25ee7cb09c6dbd849

Test and Documentation Plan

run regression tests

• Assignee: Jacek Lewandowski
• Reporter: Jacek Lewandowski

Authors

Jacek Lewandowski

Reviewers

Benjamin Lerer, Ekaterina Dimitrova

• Created: 11/Oct/23 06:42
• Updated: 01/Dec/23 19:43
• Resolved: 31/Oct/23 10:24

Description

When the DescribeStatement is executed, it initially gets the current schema snapshot and the schema version with two separate unsynchronized calls. When the schema is being modified around that time, the schema snapshot and schema version may diverge which will result in failing or inconsistent paging. This is not super important but it is easy to fix.

Issue Links

• Discovered while testing: CASSANDRA-18747 Test failure: Fix assertion error AssertionError: Unknown keyspace system_auth\n\tat org.apache.cassandra.db.Keyspace.<init>(Keyspace.java:324)\n\tat org.apache.cassandra.db.Keyspace.lambda$open$0(Keyspace.java:162)
• links to: 4.0 PR
• links to: 4.1 PR
• links to: 5.0 PR
• links to: 5.1 PR
• links to: GitHub Pull Request #2793