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https://issues.apache.org/jira/browse/HDDS-4470?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Aravindan Vijayan resolved HDDS-4470.
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Resolution: Done
Design document has been uploaded.
> Ozone Manager Prepare for Upgrade/Downgrade design
> --------------------------------------------------
>
> Key: HDDS-4470
> URL: https://issues.apache.org/jira/browse/HDDS-4470
> Project: Hadoop Distributed Data Store
> Issue Type: Sub-task
> Components: Ozone Manager
> Reporter: Aravindan Vijayan
> Assignee: Aravindan Vijayan
> Priority: Major
> Fix For: 1.1.0
>
> Attachments: OM Prepare Upgrade,Downgrade.jpg, OM Prepare Upgrade.pdf
>
>
> *Objective of ‘Prepare Upgrade’*
> The objective of the ‘Prepare upgrade’ step is to make sure all the OMs use
> the same version of the software to update their DBs (apply transaction) for
> a given request.
> To ensure this, we need to make sure that
> * For every operational OM (at least a quorum of OMs should be operational),
> all unapplied transactions should be applied.
> * For an OM that is not operational during the prepare step, it should get a
> Ratis snapshot (entire OM RocksDB) to get up to speed with the rest of the
> OMs after the upgrade.
> The design doc is attached as a PDF, and a corresponding flow diagram that is
> mentioned in the doc is also attached.
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