netudima commented on code in PR #3761:
URL: https://github.com/apache/cassandra/pull/3761#discussion_r1901173587


##########
src/java/org/apache/cassandra/db/Mutation.java:
##########
@@ -448,7 +451,7 @@ private Serialization serialization(Mutation mutation, int 
version)
                     try (DataOutputBuffer dob = 
DataOutputBuffer.scratchBuffer.get())
                     {
                         serializeInternal(PartitionUpdate.serializer, 
mutation, dob, version);
-                        serialization = new 
CachedSerialization(dob.toByteArray());
+                        serialization = new 
CachedSerialization(dob.unsafeToByteArray());

Review Comment:
   If I find a cheap way to do it - I think I will create a separate 
improvement for it, it is more about CPU saving (while allocations are also 
affected a bit)



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