[GitHub] [kafka] C0urante commented on a diff in pull request #12020: KAFKA-13818: Add generation to consumer assignor logs

[GitBox <gi...@apache.org>]

C0urante commented on code in PR #12020:
URL: https://github.com/apache/kafka/pull/12020#discussion_r969868569


##########
clients/src/main/java/org/apache/kafka/clients/consumer/internals/ConsumerCoordinator.java:
##########
@@ -164,13 +166,23 @@ public ConsumerCoordinator(GroupRebalanceConfig rebalanceConfig,
               metricGrpPrefix,
               time);
         this.rebalanceConfig = rebalanceConfig;
-        this.log = logContext.logger(ConsumerCoordinator.class);
+        final Supplier<String> dynamicPrefix =
+            () -> logContext.logPrefix() + "[generationId=" + generation().generationId + "] ";
+        this.log = new DynamicPrefixLogger(
+            dynamicPrefix,
+            LoggerFactory.getLogger(ConsumerCoordinator.class)
+        );

Review Comment:
   Thanks @vvcephei--I'm personally a little skeptical that one stack frame is going to have a large performance impact for logging, even broker-side, but I don't mind erring on the side of caution here for now.
   
   I do still wonder about modifying the logger used by the `AbstractCoordinator` superclass, since that's (AFAIK) only used client-side?



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