...

Compatibility, Deprecation, and Migration Plan

...

For users who want to upgrade an existing job to set sources with a parallelism different from the default paralleism, the following imcompatibilities shall be noted:

1. Old state may be incompatible due to topology change resulted from breaking source chaining.
2. For CDC sources, the primary key constraint is manditary in this case to ensure data correctness.

Test Plan

The changes will be covered by UTs.