chia7712 commented on code in PR #19528:
URL: https://github.com/apache/kafka/pull/19528#discussion_r2061403840


##########
clients/clients-integration-tests/src/test/java/org/apache/kafka/clients/MetricsDuringTopicCreationDeletionTest.java:
##########
@@ -0,0 +1,194 @@
+/*
+ * 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.clients;
+
+import org.apache.kafka.common.test.ClusterInstance;
+import org.apache.kafka.common.test.api.ClusterConfigProperty;
+import org.apache.kafka.common.test.api.ClusterTest;
+import org.apache.kafka.common.test.api.Type;
+import org.apache.kafka.server.config.ReplicationConfigs;
+import org.apache.kafka.server.config.ServerConfigs;
+import org.apache.kafka.server.config.ServerLogConfigs;
+import org.apache.kafka.server.metrics.KafkaYammerMetrics;
+
+import com.yammer.metrics.core.Gauge;
+
+import org.junit.jupiter.api.BeforeEach;
+
+import java.io.Closeable;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Optional;
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.atomic.AtomicBoolean;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class MetricsDuringTopicCreationDeletionTest {
+
+    private static final String TOPIC_NAME_PREFIX = "topic";
+    private static final int TOPIC_NUM = 2;
+    private static final int CREATE_DELETE_ITERATIONS = 3;
+    private static final int REPLICATION_FACTOR = 1;
+    private static final int PARTITION_NUM = 3;
+
+    private final ClusterInstance clusterInstance;
+    private final List<String> topics;
+    private volatile boolean running = true;
+
+    private int initialOfflinePartitionsCount = 0;
+    private int initialPreferredReplicaImbalanceCount = 0;
+    private int initialUnderReplicatedPartitionCount = 0;
+
+    public MetricsDuringTopicCreationDeletionTest(ClusterInstance 
clusterInstance) {
+        this.clusterInstance = clusterInstance;
+        this.topics = new ArrayList<>();
+        for (int n = 0; n < TOPIC_NUM; n++) {
+            topics.add(TOPIC_NAME_PREFIX + n);
+        }
+    }
+
+    /*
+     * Captures initial values of key controller metrics.
+     * These will be compared with final values to detect any changes.
+     */
+    @BeforeEach
+    public void setUp() {
+        try {
+            initialOfflinePartitionsCount = 
getGauge("OfflinePartitionsCount").value();
+            initialPreferredReplicaImbalanceCount = 
getGauge("PreferredReplicaImbalanceCount").value();
+            initialUnderReplicatedPartitionCount = 
getGauge("UnderReplicatedPartitions").value();
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+    }
+
+    private Closeable runThread() {
+        var closed = new AtomicBoolean(false);
+        var f = CompletableFuture.runAsync(() -> {
+            while (!closed.get()) {
+                clusterInstance.brokers().values().forEach(broker -> {
+                    if (running) {
+                        // Get UnderReplicatedPartitions through JMX
+                        Optional<Integer> underReplicatedCount = 
KafkaYammerMetrics.defaultRegistry().allMetrics().entrySet().stream()
+                                .filter(entry -> 
entry.getKey().getName().endsWith("UnderReplicatedPartitions"))
+                                .map(entry -> ((Gauge<Integer>) 
entry.getValue()).value())
+                                .findFirst();
+
+                        int count = underReplicatedCount.orElse(0);
+                        if (count != initialUnderReplicatedPartitionCount) {
+                            running = false;
+                        }
+                    }
+                });
+
+                int offlinePartitionsCount = 
getGauge("OfflinePartitionsCount").value();
+                if (offlinePartitionsCount != initialOfflinePartitionsCount) {
+                    running = false;
+                }
+
+                int preferredReplicaImbalanceCount = 
getGauge("PreferredReplicaImbalanceCount").value();
+                if (preferredReplicaImbalanceCount != 
initialPreferredReplicaImbalanceCount) {
+                    running = false;
+                }
+            }
+        });
+        return () -> {
+            closed.set(true);
+            f.join();
+        };
+    }
+
+    /*
+     * Checking all metrics we care in a single test is faster though it would 
be more elegant to have 3 @Test methods
+     */
+    @ClusterTest(
+        types = {Type.KRAFT},
+        serverProperties = {
+            @ClusterConfigProperty(key = 
ServerConfigs.DELETE_TOPIC_ENABLE_CONFIG, value = "true"),
+            @ClusterConfigProperty(key = "log.initial.task.delay.ms", value = 
"100"),
+            @ClusterConfigProperty(key = "log.segment.delete.delay.ms", value 
= "1000"),
+            @ClusterConfigProperty(key = 
ServerLogConfigs.AUTO_CREATE_TOPICS_ENABLE_CONFIG, value = "false"),
+            // speed up the test for UnderReplicatedPartitions, which relies 
on the ISR expiry thread to execute concurrently with topic creation
+            // But the replica.lag.time.max.ms value still need to consider 
the slow Jenkins testing environment
+            @ClusterConfigProperty(key = 
ReplicationConfigs.REPLICA_LAG_TIME_MAX_MS_CONFIG, value = "4000")
+        }
+    )
+    public void testMetricsDuringTopicCreateDelete() throws Exception {
+
+        // For OfflinePartitionsCount and PreferredReplicaImbalanceCount even 
with https://issues.apache.org/jira/browse/KAFKA-4605
+        // the test has worked reliably because the metric that gets triggered 
is the one generated by the first started server (controller)
+        final Gauge<Integer> offlinePartitionsCountGauge = 
getGauge("OfflinePartitionsCount");
+        final int[] offlinePartitionsCount = 
{offlinePartitionsCountGauge.value()};

Review Comment:
   Pardon me, why to use `int[]`? 



##########
clients/clients-integration-tests/src/test/java/org/apache/kafka/clients/MetricsDuringTopicCreationDeletionTest.java:
##########
@@ -0,0 +1,194 @@
+/*
+ * 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.clients;
+
+import org.apache.kafka.common.test.ClusterInstance;
+import org.apache.kafka.common.test.api.ClusterConfigProperty;
+import org.apache.kafka.common.test.api.ClusterTest;
+import org.apache.kafka.common.test.api.Type;
+import org.apache.kafka.server.config.ReplicationConfigs;
+import org.apache.kafka.server.config.ServerConfigs;
+import org.apache.kafka.server.config.ServerLogConfigs;
+import org.apache.kafka.server.metrics.KafkaYammerMetrics;
+
+import com.yammer.metrics.core.Gauge;
+
+import org.junit.jupiter.api.BeforeEach;
+
+import java.io.Closeable;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Optional;
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.atomic.AtomicBoolean;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class MetricsDuringTopicCreationDeletionTest {
+
+    private static final String TOPIC_NAME_PREFIX = "topic";
+    private static final int TOPIC_NUM = 2;
+    private static final int CREATE_DELETE_ITERATIONS = 3;
+    private static final int REPLICATION_FACTOR = 1;
+    private static final int PARTITION_NUM = 3;
+
+    private final ClusterInstance clusterInstance;
+    private final List<String> topics;
+    private volatile boolean running = true;
+
+    private int initialOfflinePartitionsCount = 0;
+    private int initialPreferredReplicaImbalanceCount = 0;
+    private int initialUnderReplicatedPartitionCount = 0;
+
+    public MetricsDuringTopicCreationDeletionTest(ClusterInstance 
clusterInstance) {
+        this.clusterInstance = clusterInstance;
+        this.topics = new ArrayList<>();
+        for (int n = 0; n < TOPIC_NUM; n++) {
+            topics.add(TOPIC_NAME_PREFIX + n);
+        }
+    }
+
+    /*
+     * Captures initial values of key controller metrics.
+     * These will be compared with final values to detect any changes.
+     */
+    @BeforeEach
+    public void setUp() {
+        try {
+            initialOfflinePartitionsCount = 
getGauge("OfflinePartitionsCount").value();
+            initialPreferredReplicaImbalanceCount = 
getGauge("PreferredReplicaImbalanceCount").value();
+            initialUnderReplicatedPartitionCount = 
getGauge("UnderReplicatedPartitions").value();
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+    }
+
+    private Closeable runThread() {
+        var closed = new AtomicBoolean(false);
+        var f = CompletableFuture.runAsync(() -> {
+            while (!closed.get()) {
+                clusterInstance.brokers().values().forEach(broker -> {
+                    if (running) {
+                        // Get UnderReplicatedPartitions through JMX
+                        Optional<Integer> underReplicatedCount = 
KafkaYammerMetrics.defaultRegistry().allMetrics().entrySet().stream()
+                                .filter(entry -> 
entry.getKey().getName().endsWith("UnderReplicatedPartitions"))
+                                .map(entry -> ((Gauge<Integer>) 
entry.getValue()).value())
+                                .findFirst();
+
+                        int count = underReplicatedCount.orElse(0);
+                        if (count != initialUnderReplicatedPartitionCount) {
+                            running = false;
+                        }
+                    }
+                });
+
+                int offlinePartitionsCount = 
getGauge("OfflinePartitionsCount").value();
+                if (offlinePartitionsCount != initialOfflinePartitionsCount) {
+                    running = false;
+                }
+
+                int preferredReplicaImbalanceCount = 
getGauge("PreferredReplicaImbalanceCount").value();
+                if (preferredReplicaImbalanceCount != 
initialPreferredReplicaImbalanceCount) {
+                    running = false;
+                }
+            }
+        });
+        return () -> {
+            closed.set(true);
+            f.join();
+        };
+    }
+
+    /*
+     * Checking all metrics we care in a single test is faster though it would 
be more elegant to have 3 @Test methods
+     */
+    @ClusterTest(
+        types = {Type.KRAFT},
+        serverProperties = {
+            @ClusterConfigProperty(key = 
ServerConfigs.DELETE_TOPIC_ENABLE_CONFIG, value = "true"),
+            @ClusterConfigProperty(key = "log.initial.task.delay.ms", value = 
"100"),
+            @ClusterConfigProperty(key = "log.segment.delete.delay.ms", value 
= "1000"),
+            @ClusterConfigProperty(key = 
ServerLogConfigs.AUTO_CREATE_TOPICS_ENABLE_CONFIG, value = "false"),
+            // speed up the test for UnderReplicatedPartitions, which relies 
on the ISR expiry thread to execute concurrently with topic creation
+            // But the replica.lag.time.max.ms value still need to consider 
the slow Jenkins testing environment
+            @ClusterConfigProperty(key = 
ReplicationConfigs.REPLICA_LAG_TIME_MAX_MS_CONFIG, value = "4000")
+        }
+    )
+    public void testMetricsDuringTopicCreateDelete() throws Exception {
+
+        // For OfflinePartitionsCount and PreferredReplicaImbalanceCount even 
with https://issues.apache.org/jira/browse/KAFKA-4605
+        // the test has worked reliably because the metric that gets triggered 
is the one generated by the first started server (controller)
+        final Gauge<Integer> offlinePartitionsCountGauge = 
getGauge("OfflinePartitionsCount");
+        final int[] offlinePartitionsCount = 
{offlinePartitionsCountGauge.value()};
+
+        final Gauge<Integer> preferredReplicaImbalanceCountGauge = 
getGauge("PreferredReplicaImbalanceCount");
+        final int[] preferredReplicaImbalanceCount = 
{preferredReplicaImbalanceCountGauge.value()};
+
+        // For UnderReplicatedPartitions, because of 
https://issues.apache.org/jira/browse/KAFKA-4605
+        // we can't access the metrics value of each server. So instead we 
directly invoke the method
+        // replicaManager.underReplicatedPartitionCount() that defines the 
metrics value.
+        final int underReplicatedPartitionCount = 0;

Review Comment:
   we need to update `underReplicatedPartitionCount`, right? 



##########
clients/clients-integration-tests/src/test/java/org/apache/kafka/clients/MetricsDuringTopicCreationDeletionTest.java:
##########
@@ -0,0 +1,194 @@
+/*
+ * 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.clients;
+
+import org.apache.kafka.common.test.ClusterInstance;
+import org.apache.kafka.common.test.api.ClusterConfigProperty;
+import org.apache.kafka.common.test.api.ClusterTest;
+import org.apache.kafka.common.test.api.Type;
+import org.apache.kafka.server.config.ReplicationConfigs;
+import org.apache.kafka.server.config.ServerConfigs;
+import org.apache.kafka.server.config.ServerLogConfigs;
+import org.apache.kafka.server.metrics.KafkaYammerMetrics;
+
+import com.yammer.metrics.core.Gauge;
+
+import org.junit.jupiter.api.BeforeEach;
+
+import java.io.Closeable;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Optional;
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.atomic.AtomicBoolean;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class MetricsDuringTopicCreationDeletionTest {
+
+    private static final String TOPIC_NAME_PREFIX = "topic";
+    private static final int TOPIC_NUM = 2;
+    private static final int CREATE_DELETE_ITERATIONS = 3;
+    private static final int REPLICATION_FACTOR = 1;
+    private static final int PARTITION_NUM = 3;
+
+    private final ClusterInstance clusterInstance;
+    private final List<String> topics;
+    private volatile boolean running = true;
+
+    private int initialOfflinePartitionsCount = 0;
+    private int initialPreferredReplicaImbalanceCount = 0;
+    private int initialUnderReplicatedPartitionCount = 0;
+
+    public MetricsDuringTopicCreationDeletionTest(ClusterInstance 
clusterInstance) {
+        this.clusterInstance = clusterInstance;
+        this.topics = new ArrayList<>();
+        for (int n = 0; n < TOPIC_NUM; n++) {
+            topics.add(TOPIC_NAME_PREFIX + n);
+        }
+    }
+
+    /*
+     * Captures initial values of key controller metrics.
+     * These will be compared with final values to detect any changes.
+     */
+    @BeforeEach
+    public void setUp() {
+        try {
+            initialOfflinePartitionsCount = 
getGauge("OfflinePartitionsCount").value();
+            initialPreferredReplicaImbalanceCount = 
getGauge("PreferredReplicaImbalanceCount").value();
+            initialUnderReplicatedPartitionCount = 
getGauge("UnderReplicatedPartitions").value();
+        } catch (Exception e) {

Review Comment:
   we can throw the exception directly, right?



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