jsancio commented on code in PR #19545:
URL: https://github.com/apache/kafka/pull/19545#discussion_r2058871135


##########
core/src/test/scala/integration/kafka/server/KRaftClusterTest.scala:
##########
@@ -1619,6 +1619,55 @@ class KRaftClusterTest {
     }
   }
 
+  /**
+   * Test that once a cluster is formatted, a bootstrap.metadata file that 
contains an unsupported
+   * MetadataVersion is not a problem. This is a regression test for 
KAFKA-19192.
+   */
+  @Test
+  def testOldBootstrapMetadataFile(): Unit = {
+    val baseDirectory = TestUtils.tempDir().toPath()
+    val cluster = new KafkaClusterTestKit.Builder(
+      new TestKitNodes.Builder().
+        setNumBrokerNodes(1).
+        setNumControllerNodes(1).
+        setBaseDirectory(baseDirectory).
+          build()).
+      setDeleteOnClose(false).
+        build()
+    try {
+      cluster.format()
+      cluster.startup()
+      cluster.waitForReadyBrokers()
+    } finally {
+      cluster.close()
+    }

Review Comment:
   Scala recently added the Using type. It has support for closing or releasing 
resources.
   
   ```java
       Using.resource(new KafkaClusterTestKit.Builder(
         new TestKitNodes.Builder().
           setNumBrokerNodes(1).
           setNumControllerNodes(1).
           setBaseDirectory(baseDirectory).
             build()).
         setDeleteOnClose(false).
           build()
       ) { cluster =>
         cluster.format()
         cluster.startup()
         cluster.waitForReadyBrokers()
       }
   ```
   
   This comment also applies to the creation and usage of the `cluster2` object 
in this method.



##########
core/src/test/scala/integration/kafka/server/KRaftClusterTest.scala:
##########


Review Comment:
   This comment applies to the PR description.
   
   In the description you have "When the server tries to read the 
bootstrap.metadata file". Do you mean "the bootstrap.checkpoint" file?



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