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https://issues.apache.org/jira/browse/HDDS-5474?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17391794#comment-17391794
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Ethan Rose commented on HDDS-5474:
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While we are investigating increased restrictions on datanodes during
finalization, we may also want to reconsider whether to allow importing closed
containers to datanodes while they are finalizing. This is currently allowed,
but could cause issues for a disrupting feature that needs to be onboarded.
> Stop reads and writes on datanodes during major upgrades
> --------------------------------------------------------
>
> Key: HDDS-5474
> URL: https://issues.apache.org/jira/browse/HDDS-5474
> Project: Apache Ozone
> Issue Type: Sub-task
> Reporter: Ethan Rose
> Assignee: Ethan Rose
> Priority: Major
>
> Some backwards incompatible changes like HDDS-4866 may need to reformat
> containers or volumes during upgrade. We currently cannot safely do this
> during finalize because we do not block reads on the datanode while it is
> finalizing, only writes. This jira is to investigate having an option to
> block writes on datanodes during finalization of more invasive upgrade
> actions, while leaving the normal read only requirement for minor upgrade
> changes.
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