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https://issues.apache.org/jira/browse/HDDS-4480?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ethan Rose updated HDDS-4480:
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Component/s: OM
> Implement OM Prepare Request/Response
> -------------------------------------
>
> Key: HDDS-4480
> URL: https://issues.apache.org/jira/browse/HDDS-4480
> Project: Hadoop Distributed Data Store
> Issue Type: Sub-task
> Components: OM
> Reporter: Ethan Rose
> Assignee: Ethan Rose
> Priority: Major
>
> Add the new OM request that will be used to prepare the OM for upgrade. In
> the OzoneManagerStateMachine#preAppendTransaction (on the leader OM), this
> involves turning on the prepare flag to only allow cancel or prepare requests
> through. In the applyTransaction step for this request (on all OMs), this
> involves setting the prepare flag, taking a snapshot, purging the log, and
> creating a marker file with the prepare request's transaction log index. This
> transaction log index will be returned in the response to the caller.
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