kamalcph commented on code in PR #15917:
URL: https://github.com/apache/kafka/pull/15917#discussion_r1597048065


##########
storage/src/test/java/org/apache/kafka/server/log/remote/metadata/storage/RemoteLogMetadataManagerTestUtils.java:
##########
@@ -0,0 +1,119 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.kafka.server.log.remote.metadata.storage;
+
+import org.apache.kafka.clients.CommonClientConfigs;
+import org.apache.kafka.common.TopicIdPartition;
+import org.apache.kafka.test.TestUtils;
+import org.junit.jupiter.api.Assertions;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Objects;
+import java.util.Set;
+
+import static 
org.apache.kafka.server.log.remote.metadata.storage.TopicBasedRemoteLogMetadataManagerConfig.BROKER_ID;
+import static 
org.apache.kafka.server.log.remote.metadata.storage.TopicBasedRemoteLogMetadataManagerConfig.LOG_DIR;
+import static 
org.apache.kafka.server.log.remote.metadata.storage.TopicBasedRemoteLogMetadataManagerConfig.REMOTE_LOG_METADATA_COMMON_CLIENT_PREFIX;
+import static 
org.apache.kafka.server.log.remote.metadata.storage.TopicBasedRemoteLogMetadataManagerConfig.REMOTE_LOG_METADATA_TOPIC_PARTITIONS_PROP;
+import static 
org.apache.kafka.server.log.remote.metadata.storage.TopicBasedRemoteLogMetadataManagerConfig.REMOTE_LOG_METADATA_TOPIC_REPLICATION_FACTOR_PROP;
+import static 
org.apache.kafka.server.log.remote.metadata.storage.TopicBasedRemoteLogMetadataManagerConfig.REMOTE_LOG_METADATA_TOPIC_RETENTION_MS_PROP;
+
+class RemoteLogMetadataManagerTestUtils {
+    private static final Logger log = 
LoggerFactory.getLogger(RemoteLogMetadataManagerTestUtils.class);
+
+    static final int METADATA_TOPIC_PARTITIONS_COUNT = 3;
+    static final short METADATA_TOPIC_REPLICATION_FACTOR = 2;
+    static final long METADATA_TOPIC_RETENTION_MS = 24 * 60 * 60 * 1000L;
+
+    static Builder builder() {
+        return new Builder();
+    }
+
+    static class Builder {
+        private String bootstrapServers;
+        private Set<TopicIdPartition> topicIdPartitions = 
Collections.emptySet();
+        private boolean startConsumerThread;
+        private RemoteLogMetadataTopicPartitioner 
remoteLogMetadataTopicPartitioner;
+        private Map<String, Object> overrideRemoteLogMetadataManagerProps = 
Collections.emptyMap();
+
+        private Builder() {
+        }
+
+        public Builder bootstrapServers(String bootstrapServers) {
+            this.bootstrapServers = Objects.requireNonNull(bootstrapServers);
+            return this;
+        }
+
+        public Builder topicIdPartitions(Set<TopicIdPartition> 
topicIdPartitions) {
+            this.topicIdPartitions = Objects.requireNonNull(topicIdPartitions);
+            return this;
+        }
+
+        public Builder startConsumerThread(boolean startConsumerThread) {
+            this.startConsumerThread = startConsumerThread;
+            return this;
+        }
+
+        public Builder 
remoteLogMetadataTopicPartitioner(RemoteLogMetadataTopicPartitioner 
remoteLogMetadataTopicPartitioner) {
+            this.remoteLogMetadataTopicPartitioner = 
Objects.requireNonNull(remoteLogMetadataTopicPartitioner);
+            return this;
+        }
+
+        public Builder overrideRemoteLogMetadataManagerProps(Map<String, 
Object> overrideRemoteLogMetadataManagerProps) {
+            this.overrideRemoteLogMetadataManagerProps = 
Objects.requireNonNull(overrideRemoteLogMetadataManagerProps);
+            return this;
+        }
+
+        public TopicBasedRemoteLogMetadataManager build() {
+            String logDir = 
TestUtils.tempDirectory("rlmm_segs_").getAbsolutePath();
+            TopicBasedRemoteLogMetadataManager 
topicBasedRemoteLogMetadataManager = new 
TopicBasedRemoteLogMetadataManager(startConsumerThread);
+
+            // Initialize TopicBasedRemoteLogMetadataManager.
+            Map<String, Object> configs = new HashMap<>();
+            configs.put(REMOTE_LOG_METADATA_COMMON_CLIENT_PREFIX + 
CommonClientConfigs.BOOTSTRAP_SERVERS_CONFIG, bootstrapServers);
+            configs.put(BROKER_ID, 0);
+            configs.put(LOG_DIR, logDir);
+            configs.put(REMOTE_LOG_METADATA_TOPIC_PARTITIONS_PROP, 
METADATA_TOPIC_PARTITIONS_COUNT);
+            configs.put(REMOTE_LOG_METADATA_TOPIC_REPLICATION_FACTOR_PROP, 
METADATA_TOPIC_REPLICATION_FACTOR);
+            configs.put(REMOTE_LOG_METADATA_TOPIC_RETENTION_MS_PROP, 
METADATA_TOPIC_RETENTION_MS);
+
+            log.debug("TopicBasedRemoteLogMetadataManager configs before 
adding overridden properties: {}", configs);
+            // Add override properties.
+            configs.putAll(overrideRemoteLogMetadataManagerProps);
+            log.debug("TopicBasedRemoteLogMetadataManager configs after adding 
overridden properties: {}", configs);
+
+            topicBasedRemoteLogMetadataManager.configure(configs);
+            if (remoteLogMetadataTopicPartitioner != null) {
+                
topicBasedRemoteLogMetadataManager.setRlmTopicPartitioner(remoteLogMetadataTopicPartitioner);
+            }
+            Assertions.assertDoesNotThrow(() -> 
waitUntilInitialized(topicBasedRemoteLogMetadataManager, 60_000));
+
+            
topicBasedRemoteLogMetadataManager.onPartitionLeadershipChanges(topicIdPartitions,
 Collections.emptySet());

Review Comment:
   this line can also be removed:
   
   ```
   
topicBasedRemoteLogMetadataManager.onPartitionLeadershipChanges(topicIdPartitions,
 Collections.emptySet());
   ```



##########
storage/src/test/java/org/apache/kafka/server/log/remote/metadata/storage/TopicBasedRemoteLogMetadataManagerTest.java:
##########
@@ -16,153 +16,127 @@
  */
 package org.apache.kafka.server.log.remote.metadata.storage;
 
+import kafka.test.ClusterInstance;
+import kafka.test.annotation.ClusterTest;
+import kafka.test.annotation.ClusterTestDefaults;
+import kafka.test.junit.ClusterTestExtensions;
 import org.apache.kafka.clients.admin.Admin;
+import org.apache.kafka.clients.admin.NewTopic;
 import org.apache.kafka.common.TopicIdPartition;
 import org.apache.kafka.common.TopicPartition;
 import org.apache.kafka.common.Uuid;
-import org.apache.kafka.common.network.ListenerName;
 import org.apache.kafka.common.utils.MockTime;
 import org.apache.kafka.common.utils.Time;
 import org.apache.kafka.common.utils.Utils;
 import org.apache.kafka.server.log.remote.storage.RemoteLogSegmentId;
 import org.apache.kafka.server.log.remote.storage.RemoteLogSegmentMetadata;
 import 
org.apache.kafka.server.log.remote.storage.RemoteResourceNotFoundException;
 import org.apache.kafka.server.log.remote.storage.RemoteStorageException;
-import org.junit.jupiter.api.AfterEach;
 import org.junit.jupiter.api.Assertions;
-import org.junit.jupiter.api.BeforeEach;
-import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
-import scala.collection.JavaConverters;
-import scala.collection.Seq;
 
 import java.io.IOException;
-import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.Collections;
-import java.util.HashMap;
-import java.util.List;
-import java.util.Properties;
 import java.util.concurrent.TimeoutException;
 
-@SuppressWarnings("deprecation") // Added for Scala 2.12 compatibility for 
usages of JavaConverters
+@ExtendWith(ClusterTestExtensions.class)
+@ClusterTestDefaults(brokers = 3)

Review Comment:
   ```suggestion
   @ClusterTestDefaults(brokers = 3, clusterType = Type.ALL)
   ```
   
   Do we enable the other cluster types such as `Raft-Isolated` and 
`Raft-Combined` later?



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