leozhangsr opened a new pull request, #20701:
URL: https://github.com/apache/flink/pull/20701

   ## What is the purpose of the change
   
   Fix the bug relative to 
[FLINK-29128](https://issues.apache.org/jira/browse/FLINK-29128).
   Add a new situation for split changes handling result to avoid the 
IllegalStateException which is thrown by the kafka consumer api(function: 
consumer.position).
   
   ## Brief change log
   
     - Get the kafka consumer's assignment first, the topic partition set.
     - Get starting offset by the consumer if the assigned topic partition set 
contains the specific topic partition.
     - Otherwise leave information for the new situation, since this partition 
has been finished and unassigned.
   
   ## Verifying this change
   
   This change is already covered by existing tests, such as 
KafkaPartitionSplitReaderTest#testAssignEmptySplit, but the log level must set 
to debug.
   
   ## 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, ZooKeeper: (no)
     - The S3 file system connector: (no)
   
   ## Documentation
   
     - Does this pull request introduce a new feature? (no)
     - If yes, how is the feature documented? (not documented)
   


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