Issue Summary

There is a need to verify downgrade compatibility for databases that lack chunk cache metadata. The scenario involves generating a database without chunk cache information in the metadata and then opening it with an older WiredTiger (wt) version. This test is important to ensure there are no unforeseen issues when downgrading, which could impact the project's risk profile.

Context

• The project currently does not test downgrade scenarios involving databases missing chunk cache metadata.
• This test should be performed early (milestone 0) to de-risk the project.
• The proposed test involves:

1. Generating a database without chunkcache info in the metadata
2. Opening the database with an older wt version

• Estimated effort: 2 days max.

Proposed Solution

• Add a task to milestone 0 to test downgrade compatibility for databases lacking chunk cache metadata.
• Ensure that the test covers generating the database and opening it with an older wt version.
• Document any issues discovered during the test.