chia7712 commented on code in PR #15516:
URL: https://github.com/apache/kafka/pull/15516#discussion_r2314325244
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clients/src/main/java/org/apache/kafka/common/record/MemoryRecords.java:
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@@ -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:
> 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.
@Yunyung Could you please file a minor patch for it?
> 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?
The key point is the compression type rather than level. I received a
request to compress old data during compaction. The change should be
straightforward, so it seems acceptable.
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