The javadoc for FirehoseClient.putRecord() warns that Firehose buffers records before delivering them to the destination, and that consequently it may be necessary to insert newline characters into the data to "disambiguate the data blobs".
I plan to use Firehose to write json objects to S3, by calling FirehoseClient.putRecord() (many times) with single json objects. I will not use FirehoseClient.putRecordBatch() at all.
What will be written to S3? Will I get one S3 object per json object? Or is it possible that several json objects might be concatenated into a single S3 object?