[CASSANDRA-16843] List snapshots of dropped tables

• Type: Bug
• Status: Resolved
• Priority: Normal
• Resolution: Fixed
• Fix Version/s: 4.1-alpha1, 4.1
• Component/s: Local/Snapshots
• Bug Category: Correctness
• Severity: Low
• Complexity: Normal
• Discovered By: User Report
• Platform: All
• Since Version: 4.1

Source Control Link

https://github.com/apache/cassandra/commit/31aa17a2a3b18bdda723123cad811f075287807d

Test and Documentation Plan

added in-jvm dtests and unit tests - documentation will be release notes

• Assignee: Paulo Motta
• Reporter: James Brown

Authors

Paulo Motta

Reviewers

Brandon Williams, Stefan Miklosovic

• Created: 11/Aug/21 06:21
• Updated: 27/May/22 19:25
• Resolved: 29/Apr/22 22:03

Description

Auto snapshots from dropped tables don't seem to show up in nodetool listsnapshots (even though they do get cleared by nodetool clearsnapshot). This makes them kind of annoying to clean up, since you need to muck about in the data directory to find them.

Erick on the mailing list said that this seems to be an oversight and that clearsnapshot was fixed by CASSANDRA-6418.

I reproduced this both on 3.11.11 and 4.0.0.

Issue Links

• blocks: CASSANDRA-16790 Add auto_snapshot_ttl configuration
• depends upon: CASSANDRA-16451 Add ability to ttl snapshots
• Discovered while testing: CASSANDRA-17588 "Total TrueDiskSpaceUsed" computation does not include manifest and schema files
• fixes: CASSANDRA-17357 Snapshot true size computation does not include secondary indexes
• is related to: CASSANDRA-13096 Snapshots slow down jmx scraping
• is related to: CASSANDRA-17357 Snapshot true size computation does not include secondary indexes
• is related to: CASSANDRA-6418 auto_snapshots are not removable via 'nodetool clearsnapshot'
• is related to: CASSANDRA-6821 Cassandra can't delete snapshots for keyspaces that no longer exist.
• relates to: CASSANDRA-17568 Implement nodetool command to list data directories of existing tables
• relates to: CASSANDRA-13338 JMX: EstimatedPartitionCount / SnapshotSize are expensive
• Testing discovered: CASSANDRA-17267 Snapshot true size is miscalculated