[HDDS-9280] Quasi-closed container with unhealthy replicas may remain under-replicated in 4 node cluster

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Duplicate
• Component/s: SCM
• Assignee: Siddhant Sangwan
• Reporter: Ethan Rose
• Created: 14/Sep/23 02:00
• Updated: 30/Jan/24 06:47
• Resolved: 30/Jan/24 06:47

Description

This is a follow-up based on discussion around HDDS-8536 in this PR. Replication manager will try to keep all replicas with unique origin node IDs for quasi-closed containers that cannot be closed, while fully replicating the healthy replicas. This could require up to 5 replicas to satisfy, for example:

SCM state: Quasi-closed
Replica states: quasi-closed(origin 1) quasi-closed(origin 1) quasi-closed(origin 1) unhealthy(origin 2) unhealthy(origin 3)

In a 4 node cluster, or a 5 node cluster trying to decommission a node, this would remain under-replicated or get stuck. In this case, we need to choose how to proceed.

Issue Links

• duplicates: HDDS-10239 Storage Container Reconciliation