mimaison commented on code in PR #15516:
URL: https://github.com/apache/kafka/pull/15516#discussion_r2313866487


##########
clients/src/main/java/org/apache/kafka/common/record/MemoryRecords.java:
##########
@@ -293,14 +294,15 @@ private static MemoryRecordsBuilder 
buildRetainedRecordsInto(RecordBatch origina
                                                                  
ByteBufferOutputStream bufferOutputStream,
                                                                  final long 
deleteHorizonMs) {
         byte magic = originalBatch.magic();
+        Compression compression = 
Compression.of(originalBatch.compressionType()).build();

Review Comment:
   1. Right, here we could use the level if specified. I expect most topics to 
use `compression.type=producer` but in case a specific compression type and 
level is set, that would make sense to use them.
   
   2. It's not something I thought about before. Do you think there are 
scenarios where the gains of picking a different level for older data would be 
significant enough to motivate such a feature?



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