[HDDS-6886] No longer use HEALTHY_READONLY state to indicate pre-finalized datanodes - ASF JIRA

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Details

Type: Sub-task
Status: Open
Priority: Minor
Resolution: Unresolved
Affects Version/s: None
Fix Version/s: None
Component/s: None
Labels:
None

Description

The upgrade framework introduced the HEALTHY_READONLY state, which datanodes are moved to when their metadata layout version is behind SCM's. With the option for finalization to not block write operations, a 1-to-1 correspondence between this state and a datanode that needs finalization no loner makes sense.

This Jira is an investigative task to figure out how to better handle this without major incompatible proto changes. In the mean time SCM can continue to use the state to refer to datanodes that need finalization without any correctness issues, but it may pose confusion for developers and users in the long term.