Data Model Changelog

Record changes to the ZooKeeper data model which require API version increases here.

When making a model change:

• Increment the value of MODEL_API in model.py.

• Update code to use the new API by default and add backwards-compatibility handling for older versions. This makes it easier to clean up backwards-compatibility handling in the future.

• Make sure code that special cases model versions either references a model_api variable or has a comment like MODEL_API: > {version} so that we can grep for that and clean up compatability code that is no longer needed.

• Add a test to test_model_upgrade.py.

• Add an entry to this log so we can decide when to remove backwards-compatibility handlers.

Version 0

Prior Zuul version:

4.11.0

Description:

This is an implied version as of Zuul 4.12.0 to initialize the series.

Version 1

Prior Zuul version:

4.11.0

Description:

No change since Version 0. This explicitly records the component versions in ZooKeeper.