Siddhant Sangwan created HDDS-7847:
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Summary: Handle Replication of Unhealthy Replicas in RM
Key: HDDS-7847
URL: https://issues.apache.org/jira/browse/HDDS-7847
Project: Apache Ozone
Issue Type: Sub-task
Components: SCM
Reporter: Siddhant Sangwan
Assignee: Siddhant Sangwan
Fix For: 1.4.0
Note: Unhealthy refers to ContainerReplicaProto#State UNHEALTHY.
Unhealthy ratis replicas are currently not considered when checking for
replication in RatisReplicationCheckHandler. Since they are somehow corrupted,
as long as we have healthy replicas, unhealthy replicas are not touched. We
need new functionality to delete excess unhealthy replicas (with special
considerations for QUASI_CLOSED containers) if we have sufficient replication
otherwise. If only unhealthy replicas are remaining, we need to replicate them
like healthy replicas.
This jira proposes:
1. Having a new handler - RatisUnhealthyReplicationCheckHandler - in the chain
of handlers. This will check for replication of all replicas, including
unhealthy. We should reach here only if there is perfect replication otherwise.
2. Add a flag to RatisContainerReplicaCount that should be enabled to consider
unhealthy replica. This will help accomplish point 1.
3. Some changes to RatisUnderReplicationHandler and RatisOverReplicationHandler.
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