Github user zsxwing commented on the issue:

    https://github.com/apache/spark/pull/15102
  
    > We do need to handle it comparing completely different topicpartitions, 
because it's entirely possible to have a job with a single topicpartition A, 
which is deleted or unsubscribed, and then single topicpartition B is added, in 
the space of one batch.
    
    Yeah, it's also possible that when a batch is running, a single 
topicpartition C is created then deleted. But the Kafka source doesn't even 
know C. The root issue is currently the approach is polling metadata, and any 
metadata changes between two pollings are missing.


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