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Posted to issues@ozone.apache.org by "Siddhant Sangwan (Jira)" <ji...@apache.org> on 2023/09/22 07:25:00 UTC
[jira] [Assigned] (HDDS-9258) LegacyReplicationManager: Pending deletes on unhealthy replicas can cause calculation errors
[ https://issues.apache.org/jira/browse/HDDS-9258?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Siddhant Sangwan reassigned HDDS-9258:
--------------------------------------
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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