v.20.1Improvement
Added MergeTree Disk Check to Prevent Data Loss
Added check for extra parts of MergeTree at different disks, in order to not allow to miss data parts at undefined disks. #8118 (Vladimir Chebotarev)Why it matters
This feature addresses the issue of potential data loss or inconsistency caused by parts ofMergeTree tables being stored on undefined or different disks. By enforcing this check, it guarantees data integrity and consistency, avoiding scenarios where parts could be misplaced or overlooked in multi-disk setups.How to use it
The check is applied automatically when managingMergeTree tables. Users do not need to enable it explicitly; it ensures that all data parts reside on defined disks, alerting or preventing operations that would result in parts being placed on undefined disks.