Ethan Rose created HDDS-15488:
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Summary: 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
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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