ijuma commented on a change in pull request #10247:
URL: https://github.com/apache/kafka/pull/10247#discussion_r585668358



##########
File path: 
clients/src/main/java/org/apache/kafka/clients/consumer/internals/AbstractCoordinator.java
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@@ -860,7 +860,7 @@ public void onSuccess(ClientResponse resp, 
RequestFuture<Void> future) {
 
         @Override
         public void onFailure(RuntimeException e, RequestFuture<Void> future) {
-            log.debug("FindCoordinator request failed due to {}", e);
+            log.debug("FindCoordinator request failed due to {}", 
e.getMessage());

Review comment:
       It's not clear what was intended here. Is the stacktrace useful or not? 
If the `{}` is removed, then the stacktrace would be printed. If we make the 
change in this PR, we don't include the stacktrace. @hachikuji Thoughts since 
you have done a lot of coordinator debugging?




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