[HDFS-16121] Iterative snapshot diff report can generate duplicate records for creates, deletes and Renames

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 3.4.0, 3.2.3, 3.3.2
• Component/s: snapshots
• Labels: pull-request-available
• Assignee: Shashikant Banerjee
• Reporter: Srinivasu Majeti
• Created: 08/Jul/21 05:50
• Updated: 09/Jul/21 09:00
• Resolved: 09/Jul/21 04:57

Description

Currently, iterative snapshot diff report first traverses the created list for a directory diff and then the deleted list. If the deleted list size is lesser than the created list size, the offset calculation in the respective list seems wrong. So the next iteration of diff report generation call, it will start iterating the already processed in the created list leading to duplicate entries in the list.

Fix is to correct the offset calculation during the traversal of the deleted list.

Issue Links

• is caused by: HDFS-13252 Code refactoring: Remove Diff.ListType
• links to: GitHub Pull Request #3188