Github user liyintang commented on the pull request:
https://github.com/apache/spark/pull/11921#issuecomment-200885500
@koeninger ,
This bug will be only triggered if there is a window function on the
KafkaRDD, which will force it to be serialized into blocks. Serializing a
ByteBuffer will serialize the entire underlying byte[], instead of that slice.
That's the motivation for this deep copy.
I can add example code in the jira. It is fairly easy to reproduce.
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