Aravindan Vijayan created HDDS-4470:
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Summary: 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
Fix For: 1.1.0
*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.
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