Jonathan Hurley created AMBARI-10639:
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Summary: Configuration Versions Should Be Calculated By the
Database
Key: AMBARI-10639
URL: https://issues.apache.org/jira/browse/AMBARI-10639
Project: Ambari
Issue Type: Task
Components: ambari-server
Affects Versions: 2.1.0
Reporter: Jonathan Hurley
Fix For: 2.1.0
{{ConfigVersionHelper}} is used by Ambari to determine the "next" version when
creating configuration versions and service configuration versions. This
presents two problems:
- In a distributed system, have an in-memory atomic does not work. When Ambari
becomes HA aware, this will be problematic.
- It does not support downgrading and removing the current maximum. There would
need to be code added in various places to always remember to decrement this
value. The decoupled nature is prone it error.
Instead, this class should be removed in favor of calculate this from the
database using a max() function on the column. This will allow removal of
configurations during downgrade to properly revert to the prior configuration
version.
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