Github user koeninger commented on the issue:
    I'm not concerned about people deleting partitions before messages have
    been processed, because they can take care of that problem themselves, by
    not deleting things until consuming has caught up. This is fairly intuitive
    I am concerned about shipping an implementation that can't handle partition
    changes at all, because that's a big step backwards.
    On Sep 18, 2016 11:41 PM, "Shixiong Zhu" <> wrote:
    > 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 
    > 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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