gaurav-narula commented on code in PR #15490:
URL: https://github.com/apache/kafka/pull/15490#discussion_r1516423400


##########
core/src/test/scala/unit/kafka/server/KafkaServerTest.scala:
##########
@@ -154,6 +159,25 @@ class KafkaServerTest extends QuorumTestHarness {
     server.shutdown()
   }
 
+  @Test
+  def testOfflineDirectoryOnMetadataCheckpointIOError(): Unit = {
+    val props = TestUtils.createBrokerConfigs(1, zkConnect).head
+    val kafkaConfig = KafkaConfig.fromProps(props)
+    val server: KafkaServer = TestUtils.createServer(kafkaConfig, new 
MockTime, None, startup = false)
+
+    val spyValue: BrokerMetadataCheckpoint = 
spy(server.brokerMetadataCheckpoints.head._2)
+    doThrow(new IOException()).when(spyValue).write(any())
+    server.brokerMetadataCheckpoints = 
server.brokerMetadataCheckpoints.updated(server.brokerMetadataCheckpoints.head._1,
 spyValue)
+
+    try {
+      server.startup()
+      
assertTrue(server.logDirFailureChannel.hasOfflineLogDir(kafkaConfig.logDirs.head),

Review Comment:
   ~Could this flake? Might be worth enclosing in `TestUtils.waitUntilTrue` 
perhaps?~
   
   nvm, it's invoked in `startup()`



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