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https://issues.apache.org/jira/browse/HDDS-9258?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Siddhant Sangwan reassigned HDDS-9258:
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Assignee: Siddhant Sangwan
> LegacyReplicationManager: Pending deletes on unhealthy replicas can cause
> calculation errors
> --------------------------------------------------------------------------------------------
>
> Key: HDDS-9258
> URL: https://issues.apache.org/jira/browse/HDDS-9258
> Project: Apache Ozone
> Issue Type: Sub-task
> Components: SCM
> Reporter: Siddhant Sangwan
> Assignee: Siddhant Sangwan
> Priority: Major
>
> In RatisContainerReplicaCount, should we discount any pending deletes for
> replicas that LRM sees as unhealthy? Since we ignore UNHEALTHY containers, it
> makes sense to not count their pending deletes.
> Suppose there's a CLOSED container with replicas:
> CLOSED, CLOSED, CLOSED, UNHEALTHY (not counted, seen as excess that can be
> deleted).
> In the current iteration, RM sends a delete command for the unhealthy, so now
> there's a pending delete. In the next iteration, if the delete is still
> pending, then RM will see 3 CLOSED replicas - 1 pending delete + 1 UNHEALTHY
> replica. But UNHEALTHY replicas are ignored, that's effectively 3 CLOSED
> replicas - 1 pending delete (even though the delete is for the UNHEALTHY).
> This means the effective count becomes 2, which is seen as under replicated.
> Of course, this container is not actually under replicated. We need to verify
> if it's actually a bug - I have not written any tests to reproduce this yet.
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