squah-confluent commented on code in PR #21555:
URL: https://github.com/apache/kafka/pull/21555#discussion_r2869769679


##########
group-coordinator/src/main/java/org/apache/kafka/coordinator/group/GroupCoordinatorService.java:
##########
@@ -276,7 +280,14 @@ public GroupCoordinatorService build() {
                     .withSerializer(new GroupCoordinatorRecordSerde())
                     
.withCompression(Compression.of(config.offsetTopicCompressionType()).build())
                     .withAppendLingerMs(config.appendLingerMs())
-                    .withExecutorService(Executors.newSingleThreadExecutor())
+                    .withExecutorService(Executors.newFixedThreadPool(
+                        config.numBackgroundThreads(),
+                        runnable -> new KafkaThread(

Review Comment:
   I thought 11 was for clients? I can't get it to compile locally unless I 
also bump the `minNonClientJavaVersion` to 21.



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