cmccabe commented on a change in pull request #10504:
URL: https://github.com/apache/kafka/pull/10504#discussion_r635572503



##########
File path: core/src/test/java/kafka/test/junit/ZkClusterInvocationContext.java
##########
@@ -248,5 +261,17 @@ public void stop() {
                 clusterReference.get().tearDown();
             }
         }
+
+        @Override
+        public void rollingBrokerRestart() {
+            if (started.get()) {
+                for (int i = 0; i < clusterReference.get().brokerCount(); i++) 
{
+                    clusterReference.get().killBroker(i);
+                }
+                clusterReference.get().restartDeadBrokers(true);
+            } else {

Review comment:
       It would be a bit nicer to move this section to the front, to get rid of 
the nesting here.

##########
File path: core/src/test/java/kafka/test/junit/ZkClusterInvocationContext.java
##########
@@ -248,5 +261,17 @@ public void stop() {
                 clusterReference.get().tearDown();
             }
         }
+
+        @Override
+        public void rollingBrokerRestart() {
+            if (started.get()) {
+                for (int i = 0; i < clusterReference.get().brokerCount(); i++) 
{
+                    clusterReference.get().killBroker(i);
+                }
+                clusterReference.get().restartDeadBrokers(true);
+            } else {

Review comment:
       It would be a bit nicer to move this section to the beginning, to get 
rid of the nesting here.




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