[HDDS-8364] ReadReplicas may give wrong results with topology-aware read enabled

• Type: Bug
• Status: Resolved
• Priority: Blocker
• Resolution: Fixed
• Fix Version/s: 1.4.0
• Component/s: Tools
• Labels: pull-request-available
• Target Version/s: 1.4.0
• Assignee: Attila Doroszlai
• Reporter: Attila Doroszlai
• Created: 03/Apr/23 14:33
• Updated: 04/Apr/23 04:56
• Resolved: 04/Apr/23 04:56

Description

Due to same root cause as HDDS-8276, ozone debug read-replicas may give wrong results with topology-aware read enabled. It creates a single-node copy of the original pipeline for each replica, but only updates nodes, not nodesInOrder. If the replica is stale (offline but not yet dead), read is attempted and fails, and the client checks if there are any fallback nodes. There should be none left (single-node pipeline), but with topology-aware read enabled the other two nodes are still present in the list.

Issue Links

• blocks: HDDS-8300 Enable topology aware replication and reads by default
• links to: GitHub Pull Request #4522