[HDDS-2446] ContainerReplica should contain DatanodeInfo rather than DatanodeDetails

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Won't Do
• Affects Version/s: 0.5.0
• Component/s: SCM
• Labels: pull-request-available
• Target Version/s: 0.5.0
• Assignee: Stephen O'Donnell
• Reporter: Stephen O'Donnell
• Created: 08/Nov/19 10:52
• Updated: 15/Nov/19 17:33
• Resolved: 15/Nov/19 17:33

Description

The ContainerReplica object is used by the SCM to track containers reported by the datanodes. The current fields stored in ContainerReplica are:

final private ContainerID containerID;
final private ContainerReplicaProto.State state;
final private DatanodeDetails datanodeDetails;
final private UUID placeOfBirth;

Now we have introduced decommission and maintenance mode, the replication manager (and potentially other parts of the code) need to know the status of the replica in terms of IN_SERVICE, DECOMMISSIONING, DECOMMISSIONED etc to make replication decisions.

The DatanodeDetails object does not carry this information, however the DatanodeInfo object extends DatanodeDetails and does carry the required information.

As DatanodeInfo extends DatanodeDetails, any place which needs a DatanodeDetails can accept a DatanodeInfo instead.

In this Jira I propose we change the DatanodeDetails stored in ContainerReplica to DatanodeInfo.

Issue Links

• links to: GitHub Pull Request #131