dajac commented on code in PR #12298:
URL: https://github.com/apache/kafka/pull/12298#discussion_r898913278


##########
clients/src/main/java/org/apache/kafka/clients/consumer/internals/AbstractCoordinator.java:
##########
@@ -478,8 +478,13 @@ boolean joinGroupIfNeeded(final Timer timer) {
 
                 resetJoinGroupFuture();
                 synchronized (AbstractCoordinator.this) {
-                    rejoinReason = String.format("rebalance failed due to '%s' 
(%s)", exception.getMessage(), exception.getClass().getSimpleName());
-                    rejoinNeeded = true;
+                    final String shortReason = String.format("rebalance failed 
due to an exception: (%s)",
+                        exception.getMessage(),

Review Comment:
   I guess it is due to this:
   ```
       public Throwable(Throwable cause) {
           fillInStackTrace();
           detailMessage = (cause==null ? null : cause.toString());
           this.cause = cause;
       }
   ``` 
   `cause.toString()` contains the stack trace.



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