absurdfarce commented on code in PR #2060:
URL: 
https://github.com/apache/cassandra-java-driver/pull/2060#discussion_r2492369386


##########
core/src/main/java/com/datastax/oss/driver/api/core/tracker/RequestIdGenerator.java:
##########
@@ -67,11 +67,27 @@ default String getCustomPayloadKey() {
 
   default Statement<?> getDecoratedStatement(
       @NonNull Statement<?> statement, @NonNull String requestId) {
-    Map<String, ByteBuffer> customPayload =
-        NullAllowingImmutableMap.<String, ByteBuffer>builder()
-            .putAll(statement.getCustomPayload())
-            .put(getCustomPayloadKey(), 
ByteBuffer.wrap(requestId.getBytes(StandardCharsets.UTF_8)))
-            .build();
-    return statement.setCustomPayload(customPayload);
+
+    // local copy
+    Map<String, ByteBuffer> existing = statement.getCustomPayload();
+    String key = getCustomPayloadKey();
+
+    NullAllowingImmutableMap.Builder<String, ByteBuffer> builder =

Review Comment:
   I did some spelunking and it looks like @emerkle826 made that mod [way back 
in the day](https://github.com/apache/cassandra-java-driver/pull/1087).  I've 
already pinged him ~~demanding that he explain himself~~ asking very politely 
if we could provide the relevant context 🧌 



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