[HDDS-9729] Provide API to check a container via Replication Manager

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 1.4.0
• Component/s: SCM
• Labels: pull-request-available
• Target Version/s: 1.4.0
• Assignee: Stephen O'Donnell
• Reporter: Stephen O'Donnell
• Created: 20/Nov/23 14:44
• Updated: 03/Jan/24 10:26
• Resolved: 01/Dec/23 11:55

Description

Replication Manager has increasingly complex logic used to check if a container is under or over replicated, unhealthy etc.

Other parts of the system, such as Decommission and Recon also need to know if a set of containers are healthy or not, but they currently have their own logic to do this, which can result in a mis-match in health states between RM and Recon or decommission.

This PR exposes the container check chain used by RM to check containers, and allows it to be called in a read-only way, avoiding any commands being sent.

The results of the call populate a ReplicationManagerReport instance passed into the command, which allows the call to check the state of containers checked.

In a later PR, we plan to integrate the Decommission Monitor with this API so it does not have any of its own logic to determine if a container is under-replicated or not.

Issue Links

• fixes: HDDS-9808 Decommission should get the correct ContainerReplicaCount object
• links to: GitHub Pull Request #5632