So, the strategy you are proposing is ...

1. If the record batches which down conversion is requested start with ZSTD 
compressed batches, return a UNSUPPORTED_COMPRESSION_TYPE error.
2. If there ZSTD compressed batches are in the middle of the batches, takes 
fallback to case 1 by returning normal batches with overflow records.

Am I right? As far as I understand, this strategy looks perfectly reasonable to 
me.

If you add some update, I will update the downconversion logic part in KIP 
document appropriately ASAP. Thanks in advance!

[ Full content available at: https://github.com/apache/kafka/pull/2267 ]
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