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https://issues.apache.org/jira/browse/HDDS-1266?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16815993#comment-16815993
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Anu Engineer commented on HDDS-1266:
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{quote}Another aspect I forget to mention in my last comment, the doc has
designed a lot about how to do the upgrade but how the downgrade behavior it
will be?
{quote}
Very good catch, I will add that as a section. Basically it would boil down to
deleting each container and then deleting SCM and OM. That would take us back
to HDFS cluster. But I think we should have this section in the document.
> [Ozone upgrade] Support Upgrading HDFS clusters to use Ozone
> ------------------------------------------------------------
>
> Key: HDDS-1266
> URL: https://issues.apache.org/jira/browse/HDDS-1266
> Project: Hadoop Distributed Data Store
> Issue Type: New Feature
> Reporter: Anu Engineer
> Assignee: Anu Engineer
> Priority: Major
> Attachments: InPlaceUpgradesForOzone.pdf
>
>
> This is the master JIRA to support upgrading existing HDFS clusters to have
> Ozone running concurrently. One of the requirements is that we support
> upgrading from HDFS to Ozone, without a full data copy. This requirement is
> called "In Place upgrade", the end result of such an upgrade would be to have
> the HDFS data appear in Ozone as if Ozone has taken a snap-shot of the HDFS
> data. Once upgrade is complete, Ozone and HDFS will act as independent
> systems. I will post a design document soon.
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