JingsongLi opened a new pull request #12544:
URL: https://github.com/apache/flink/pull/12544


   
   ## What is the purpose of the change
   
   - RowGenerator in datagen factory should implement snapshotState, otherwise 
it is not exactly-once and loose data.
   - If you create a "datagen" connector with a squence data type and do not 
provide "start" and "end" you'll see a validation error like below. Instead of 
logging the property an OptionBuilder is logged instead.
   
   ## Verifying this change
   
   `DataGenTableSourceFactoryTest`
   
   ## Does this pull request potentially affect one of the following parts:
   
     - Dependencies (does it add or upgrade a dependency): no
     - The public API, i.e., is any changed class annotated with 
`@Public(Evolving)`: no
     - The serializers: no
     - The runtime per-record code paths (performance sensitive): no
     - Anything that affects deployment or recovery: JobManager (and its 
components), Checkpointing, Kubernetes/Yarn/Mesos, ZooKeeper: no
     - The S3 file system connector: no
   
   ## Documentation
   
     - Does this pull request introduce a new feature? no


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