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https://issues.apache.org/jira/browse/HDDS-15488?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ethan Rose updated HDDS-15488:
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Status: Patch Available (was: Open)
> Recon upgrade actions should be idempotent
> ------------------------------------------
>
> Key: HDDS-15488
> URL: https://issues.apache.org/jira/browse/HDDS-15488
> Project: Apache Ozone
> Issue Type: Improvement
> Reporter: Ethan Rose
> Assignee: Ethan Rose
> Priority: Major
> Labels: pull-request-available
>
> All upgrade actions should be idempotent since the framework only guarantees
> they are run at least once. Recon currently works around this by:
> * Only using upgrade actions that do SQL modifications.
> ** This is not guaranteed to always be the case since future upgrade actions
> could affect Recon's RocksDB or directory structure.
> * Implementing its own upgrade action runner that commits the result of the
> actions and the version increase in a single SQL commit.
> ** This requires Recon to maintain custom upgrade code instead of using the
> common method used by every other component.
> This change will make Recon's existing upgrade actions idempotent so there is
> no dependency on Recon's custom upgrade flow. From there we can switch Recon
> to use the same mechanism to run upgrade actions as other components. Future
> upgrade actions will be able to modify any part of Recon's disk state as long
> as they are idempotent.
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