[jira] [Created] (HDDS-9352) ReplicationManager: Ignore any Datanodes that are not in-service and healthy when finding unique origins

["Siddhant Sangwan (Jira)" <ji...@apache.org>]

Siddhant Sangwan created HDDS-9352:
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             Summary: ReplicationManager: Ignore any Datanodes that are not in-service and healthy when finding unique origins
                 Key: HDDS-9352
                 URL: https://issues.apache.org/jira/browse/HDDS-9352
             Project: Apache Ozone
          Issue Type: Sub-task
          Components: SCM
            Reporter: Siddhant Sangwan
            Assignee: Siddhant Sangwan


RM needs to save UNHEALTHY replicas that have unique Origin IDs when deleting excess UNHEALTHY replicas of a QUASI_CLOSED container. This is because replicas with unique origins are used to decide whether such a container can be closed. If we can close UNHEALTHY replicas in the future, these replicas can be used to make this decision.

Currently, RM considers all replicas in the algorithm for finding out which replicas need to be saved and which should be deleted:
{code}
    // Gather the origin node IDs of replicas which are not candidates for
    // deletion.
    Set<UUID> existingOriginNodeIDs = allReplicas.stream()
        .filter(r -> !deleteCandidates.contains(r))
        .map(ContainerReplica::getOriginDatanodeId)
        .collect(Collectors.toSet());
{code}
We need to remove any DNs that are not in-service and healthy because it's likely we've already lost them or will lose them in the future.



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