Drop recursion in Fetcher _unpack_message_set #755
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Attempt to simplify unpacking of compressed messages. Related to #718 -- KafkaConsumer no longer attempts to decompress more than a single layer of messages. If a message set was double-compressed by the producer, this patch will cause KafkaConsumer to return the compressed bytes as a single message for the entire batch. A warning will be logged, but otherwise the data will no longer appear "skipped", it will appear as corrupted. If the user wants to simply skip these messages, there is a new configuration parameter
skip_double_compressed_messagesLonger term we should refactor Message / MessageSets to expose raw bytes and let handle_fetch_response unpack and decompress (this is how the java client operates)