MatthewAden commented on code in PR #16352:
URL: 
https://github.com/apache/dolphinscheduler/pull/16352#discussion_r1695277134


##########
dolphinscheduler-registry/dolphinscheduler-registry-plugins/dolphinscheduler-registry-raft/src/main/java/org/apache/dolphinscheduler/plugin/registry/raft/client/IRaftRegisterClient.java:
##########
@@ -0,0 +1,130 @@
+/*
+ * 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.dolphinscheduler.plugin.registry.raft.client;
+
+import org.apache.dolphinscheduler.registry.api.ConnectionListener;
+import org.apache.dolphinscheduler.registry.api.SubscribeListener;
+
+import java.util.Collection;
+
+public interface IRaftRegisterClient extends AutoCloseable {
+
+    /**
+     * Start the raft registry client. Once started, the client will connect 
to the raft registry server and then it can be used.
+     */
+    void start();
+
+    /**
+     * Check the connectivity of the client.
+     *
+     * @return true if the client is connected, false otherwise
+     */
+    boolean isConnectivity();
+
+    /**
+     * Subscribe to the raft registry connection state change event.
+     *
+     * @param connectionStateListener the listener to handle connection state 
changes
+     */
+    void subscribeConnectionStateChange(ConnectionListener 
connectionStateListener);
+
+    /**
+     * Subscribe to the register data change event.
+     *
+     * @param path     the path to subscribe to
+     * @param listener the listener to handle data changes
+     */
+    void subscribeRaftRegistryDataChange(String path, SubscribeListener 
listener);
+
+    /**
+     * Get the raft register data by key.
+     *
+     * @param key the key of the register data
+     * @return the value associated with the key
+     */
+    String getRegistryDataByKey(String key);
+
+    /**
+     * Put the register data to the raft registry server.
+     * <p>
+     * If the key already exists, then update the value. If the key does not 
exist, then insert a new key-value pair.
+     *
+     * @param key                the key of the register data
+     * @param value              the value to be associated with the key
+     * @param deleteOnDisconnect if true, the data will be deleted when the 
client disconnects
+     */
+    void putRegistryData(String key, String value, boolean deleteOnDisconnect);

Review Comment:
   done



##########
dolphinscheduler-registry/dolphinscheduler-registry-plugins/dolphinscheduler-registry-raft/src/main/java/org/apache/dolphinscheduler/plugin/registry/raft/RaftConnectionStateManager.java:
##########
@@ -0,0 +1,141 @@
+/*
+ * 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.dolphinscheduler.plugin.registry.raft;
+
+import org.apache.dolphinscheduler.registry.api.ConnectionListener;
+import org.apache.dolphinscheduler.registry.api.ConnectionState;
+
+import java.time.Duration;
+import java.util.List;
+import java.util.concurrent.CopyOnWriteArrayList;
+import java.util.concurrent.Executors;
+import java.util.concurrent.ScheduledExecutorService;
+import java.util.concurrent.TimeUnit;
+
+import lombok.extern.slf4j.Slf4j;
+
+import com.alipay.sofa.jraft.RouteTable;
+import com.alipay.sofa.jraft.option.CliOptions;
+import com.alipay.sofa.jraft.rpc.CliClientService;
+import com.alipay.sofa.jraft.rpc.impl.cli.CliClientServiceImpl;
+import com.google.common.util.concurrent.ThreadFactoryBuilder;
+
+@Slf4j
+public class RaftConnectionStateManager implements IRaftConnectionStateManager 
{
+
+    private static final String DEFAULT_REGION_ID = "--1";
+    private ConnectionState currentConnectionState;
+    private static final Duration CONNECT_STATE_CHECK_INTERVENE = 
Duration.ofSeconds(2);
+    private final RaftRegistryProperties properties;
+    private final List<ConnectionListener> connectionListeners = new 
CopyOnWriteArrayList<>();
+    private final ScheduledExecutorService scheduledExecutorService;
+    private final CliOptions cliOptions;
+    private final CliClientService cliClientService;
+
+    public RaftConnectionStateManager(RaftRegistryProperties properties) {
+        this.properties = properties;
+        this.cliOptions = new CliOptions();
+        this.cliOptions.setMaxRetry(3);
+        this.cliOptions.setTimeoutMs(5000);

Review Comment:
   sorry to make you repeat the same thing twice. I have finished modifying all 
the magic numbers in the file.



##########
dolphinscheduler-registry/dolphinscheduler-registry-plugins/dolphinscheduler-registry-raft/src/main/java/org/apache/dolphinscheduler/plugin/registry/raft/RaftLockManager.java:
##########
@@ -0,0 +1,139 @@
+/*
+ * 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.dolphinscheduler.plugin.registry.raft;
+
+import org.apache.dolphinscheduler.common.thread.ThreadUtils;
+import org.apache.dolphinscheduler.common.utils.NetUtils;
+import org.apache.dolphinscheduler.common.utils.OSUtils;
+
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.Executors;
+import java.util.concurrent.ScheduledExecutorService;
+import java.util.concurrent.TimeUnit;
+
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+import com.alipay.sofa.jraft.rhea.client.RheaKVStore;
+import com.alipay.sofa.jraft.rhea.util.concurrent.DistributedLock;
+import com.alipay.sofa.jraft.util.ExecutorServiceHelper;
+
+public class RaftLockManager implements IRaftLockManager {
+
+    private final Map<String, LockEntry> distributedLockMap = new 
ConcurrentHashMap<>();
+    private final RheaKVStore rheaKvStore;
+    private final RaftRegistryProperties raftRegistryProperties;
+    private static final ScheduledExecutorService WATCH_DOG = 
Executors.newSingleThreadScheduledExecutor();

Review Comment:
   This is an automatic lease renewal scheduler, and calling it watchdog might 
be more appropriate in this context. JRaft also refers to it as WatchDog.



##########
dolphinscheduler-dist/release-docs/LICENSE:
##########
@@ -572,11 +572,23 @@ The text of each license is also included at 
licenses/LICENSE-[project].txt.
     tea-rpc-util 0.1.3.jar 
https://github.com/aliyun/aliyun-openapi-java-sdk/blob/master/README.md#license 
Apache 2.0
     tea-util 0.2.13.jar 
https://github.com/aliyun/aliyun-openapi-java-sdk/blob/master/README.md#license 
Apache 2.0
     delight-nashorn-sandbox 0.3.2 
https://github.com/javadelight/delight-nashorn-sandbox/blob/master/README.md#license
 Apache 2.0
-
-
-
-
-
+    jraft-core 1.3.14: 
https://mvnrepository.com/artifact/com.alipay.sofa/jraft-core/1.3.14 Apache 2.0
+    jctools-core 2.1.1: 
https://mvnrepository.com/artifact/org.jctools/jctools-core/2.1.1 Apache 2.0
+    commons-lang 2.6 
https://mvnrepository.com/artifact/commons-lang/commons-lang/2.6 Apache 2.0
+    hessian 3.3.6: 
https://mvnrepository.com/artifact/com.alipay.sofa/hessian/3.3.6 Apache 2.0
+    metrics-core 4.2.11: 
https://mvnrepository.com/artifact/io.dropwizard.metrics/metrics-core/4.2.11 
Apache 2.0
+    affinity 3.1.7: 
https://mvnrepository.com/artifact/net.openhft/affinity/3.1.7, Apache 2.0
+    disruptor 3.3.7: 
https://mvnrepository.com/artifact/com.lmax/disruptor/3.3.7, Apache 2.0
+    commons-compress 1.21: 
https://mvnrepository.com/artifact/org.apache.commons/commons-compress/1.21 
Apache 2.0
+    bolt 1.6.4: https://mvnrepository.com/artifact/com.alipay.sofa/bolt/1.6.4, 
Apache 2.0
+    rocksdbjni 8.8.1: 
https://mvnrepository.com/artifact/org.rocksdb/rocksdbjni/8.8.1, Apache 2.0
+    jraft-rheakv-core 1.3.14: 
https://mvnrepository.com/artifact/com.alipay.sofa/jraft-rheakv-core/1.3.14, 
Apache 2.0
+    sofa-common-tools 1.0.12: 
https://mvnrepository.com/artifact/com.alipay.sofa.common/sofa-common-tools/1.0.12
 Apache 2.0
+    annotations 12.0: 
https://mvnrepository.com/artifact/com.intellij/annotations/12.0 Apache 2.0
+    protostuff-core 1.7.2: 
https://mvnrepository.com/artifact/io.protostuff/protostuff-core/1.7.2 Apache 
2.0
+    protostuff-api 1.7.2: 
https://mvnrepository.com/artifact/io.protostuff/protostuff-api/1.7.2 Apache 2.0
+    protostuff-runtime 1.7.2: 
https://mvnrepository.com/artifact/io.protostuff/protostuff-runtime/1.7.2 
Apache 2.0
+    protostuff-collectionschema 1.7.2: 
https://mvnrepository.com/artifact/io.protostuff/protostuff-collectionschema/1.7.2
 Apache 2.0

Review Comment:
   We introduced this direct dependency. 
   
           <dependency>
                   <groupId>com.alipay.sofa</groupId>
                   <artifactId>jraft-rheakv-core</artifactId>
                   <version>${jraft.version}</version>
               </dependency>
           </dependencies>
   
   These are all transitive dependencies. I'm not sure if these need to be 
written in the license.



##########
dolphinscheduler-registry/dolphinscheduler-registry-plugins/dolphinscheduler-registry-raft/src/main/java/org/apache/dolphinscheduler/plugin/registry/raft/RaftConnectionStateManager.java:
##########
@@ -0,0 +1,141 @@
+/*
+ * 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.dolphinscheduler.plugin.registry.raft;
+
+import org.apache.dolphinscheduler.registry.api.ConnectionListener;
+import org.apache.dolphinscheduler.registry.api.ConnectionState;
+
+import java.time.Duration;
+import java.util.List;
+import java.util.concurrent.CopyOnWriteArrayList;
+import java.util.concurrent.Executors;
+import java.util.concurrent.ScheduledExecutorService;
+import java.util.concurrent.TimeUnit;
+
+import lombok.extern.slf4j.Slf4j;
+
+import com.alipay.sofa.jraft.RouteTable;
+import com.alipay.sofa.jraft.option.CliOptions;
+import com.alipay.sofa.jraft.rpc.CliClientService;
+import com.alipay.sofa.jraft.rpc.impl.cli.CliClientServiceImpl;
+import com.google.common.util.concurrent.ThreadFactoryBuilder;
+
+@Slf4j
+public class RaftConnectionStateManager implements IRaftConnectionStateManager 
{
+
+    private static final String DEFAULT_REGION_ID = "--1";
+    private ConnectionState currentConnectionState;
+    private static final Duration CONNECT_STATE_CHECK_INTERVENE = 
Duration.ofSeconds(2);
+    private final RaftRegistryProperties properties;
+    private final List<ConnectionListener> connectionListeners = new 
CopyOnWriteArrayList<>();
+    private final ScheduledExecutorService scheduledExecutorService;
+    private final CliOptions cliOptions;
+    private final CliClientService cliClientService;
+
+    public RaftConnectionStateManager(RaftRegistryProperties properties) {
+        this.properties = properties;
+        this.cliOptions = new CliOptions();
+        this.cliOptions.setMaxRetry(3);
+        this.cliOptions.setTimeoutMs(5000);
+        this.cliClientService = new CliClientServiceImpl();
+        this.scheduledExecutorService = Executors.newScheduledThreadPool(
+                1,
+                new 
ThreadFactoryBuilder().setNameFormat("ConnectionStateRefreshThread").setDaemon(true).build());
+    }
+
+    public void start() {
+        cliClientService.init(cliOptions);
+        scheduledExecutorService.scheduleWithFixedDelay(
+                new ConnectionStateRefreshTask(connectionListeners),
+                CONNECT_STATE_CHECK_INTERVENE.toMillis(),
+                CONNECT_STATE_CHECK_INTERVENE.toMillis(),
+                TimeUnit.MILLISECONDS);
+    }
+
+    public void addConnectionListener(ConnectionListener listener) {

Review Comment:
   updated



##########
dolphinscheduler-registry/dolphinscheduler-registry-plugins/dolphinscheduler-registry-raft/src/main/java/org/apache/dolphinscheduler/plugin/registry/raft/RaftLockManager.java:
##########
@@ -0,0 +1,139 @@
+/*
+ * 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.dolphinscheduler.plugin.registry.raft;
+
+import org.apache.dolphinscheduler.common.thread.ThreadUtils;
+import org.apache.dolphinscheduler.common.utils.NetUtils;
+import org.apache.dolphinscheduler.common.utils.OSUtils;
+
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.Executors;
+import java.util.concurrent.ScheduledExecutorService;
+import java.util.concurrent.TimeUnit;
+
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+import com.alipay.sofa.jraft.rhea.client.RheaKVStore;
+import com.alipay.sofa.jraft.rhea.util.concurrent.DistributedLock;
+import com.alipay.sofa.jraft.util.ExecutorServiceHelper;
+
+public class RaftLockManager implements IRaftLockManager {
+
+    private final Map<String, LockEntry> distributedLockMap = new 
ConcurrentHashMap<>();
+    private final RheaKVStore rheaKvStore;
+    private final RaftRegistryProperties raftRegistryProperties;
+    private static final ScheduledExecutorService WATCH_DOG = 
Executors.newSingleThreadScheduledExecutor();
+    private static final String LOCK_OWNER_PREFIX = NetUtils.getHost() + "_" + 
OSUtils.getProcessID() + "_";
+
+    public RaftLockManager(RheaKVStore rheaKVStore, RaftRegistryProperties 
raftRegistryProperties) {
+        this.rheaKvStore = rheaKVStore;
+        this.raftRegistryProperties = raftRegistryProperties;
+    }
+
+    @Override
+    public boolean acquireLock(String lockKey) {
+        final String lockOwner = getLockOwnerPrefix();
+        if (isThreadReentrant(lockKey, lockOwner)) {
+            return true;
+        }
+
+        final DistributedLock<byte[]> distributedLock = 
rheaKvStore.getDistributedLock(lockKey,
+                raftRegistryProperties.getDistributedLockTimeout().toMillis(), 
TimeUnit.MILLISECONDS, WATCH_DOG);
+
+        while (true) {
+            if (distributedLock.tryLock()) {
+                distributedLockMap.put(lockKey, 
LockEntry.builder().distributedLock(distributedLock)
+                        .lockOwner(lockOwner)
+                        .build());
+                return true;
+            } else {
+                // fail to acquire lock
+                
ThreadUtils.sleep(raftRegistryProperties.getDistributedLockRetryInterval().toMillis());
+            }
+        }
+    }
+
+    @Override
+    public boolean acquireLock(String lockKey, long timeout) {
+        final String lockOwner = getLockOwnerPrefix();
+        if (isThreadReentrant(lockKey, lockOwner)) {
+            return true;
+        }
+        final long endTime = System.currentTimeMillis() + timeout;
+        final DistributedLock<byte[]> distributedLock = 
rheaKvStore.getDistributedLock(lockKey,
+                raftRegistryProperties.getDistributedLockTimeout().toMillis(), 
TimeUnit.MILLISECONDS, WATCH_DOG);
+
+        while (System.currentTimeMillis() < endTime) {
+            if (distributedLock.tryLock()) {
+                distributedLockMap.put(lockKey, 
LockEntry.builder().distributedLock(distributedLock)
+                        .lockOwner(lockOwner)
+                        .build());
+                return true;
+            } else {
+                // fail to acquire lock
+                
ThreadUtils.sleep(raftRegistryProperties.getDistributedLockRetryInterval().toMillis());
+            }
+        }
+
+        return false;
+    }
+
+    private boolean isThreadReentrant(String lockKey, String lockOwner) {
+        final LockEntry lockEntry = distributedLockMap.get(lockKey);
+        return lockEntry != null && lockOwner.equals(lockEntry.getLockOwner());
+    }
+
+    @Override
+    public boolean releaseLock(String lockKey) {
+        final String lockOwner = getLockOwnerPrefix();
+        final LockEntry lockEntry = distributedLockMap.get(lockKey);
+        if (lockEntry == null || !lockOwner.equals(lockEntry.getLockOwner())) {
+            return false;
+        }
+
+        final DistributedLock<byte[]> distributedLock = 
distributedLockMap.get(lockKey).getDistributedLock();
+        if (distributedLock != null) {
+            distributedLock.unlock();
+        }
+        distributedLockMap.remove(lockKey);
+        return true;
+    }
+
+    public static String getLockOwnerPrefix() {
+        return LOCK_OWNER_PREFIX + Thread.currentThread().getName();
+    }
+
+    @Data
+    @AllArgsConstructor
+    @NoArgsConstructor
+    @Builder
+    public static class LockEntry {
+
+        private DistributedLock<byte[]> distributedLock;
+        private String lockOwner;
+    }

Review Comment:
   done



##########
dolphinscheduler-registry/dolphinscheduler-registry-plugins/dolphinscheduler-registry-raft/src/main/java/org/apache/dolphinscheduler/plugin/registry/raft/RaftConnectionStateManager.java:
##########
@@ -0,0 +1,141 @@
+/*
+ * 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.dolphinscheduler.plugin.registry.raft;
+
+import org.apache.dolphinscheduler.registry.api.ConnectionListener;
+import org.apache.dolphinscheduler.registry.api.ConnectionState;
+
+import java.time.Duration;
+import java.util.List;
+import java.util.concurrent.CopyOnWriteArrayList;
+import java.util.concurrent.Executors;
+import java.util.concurrent.ScheduledExecutorService;
+import java.util.concurrent.TimeUnit;
+
+import lombok.extern.slf4j.Slf4j;
+
+import com.alipay.sofa.jraft.RouteTable;
+import com.alipay.sofa.jraft.option.CliOptions;
+import com.alipay.sofa.jraft.rpc.CliClientService;
+import com.alipay.sofa.jraft.rpc.impl.cli.CliClientServiceImpl;
+import com.google.common.util.concurrent.ThreadFactoryBuilder;
+
+@Slf4j
+public class RaftConnectionStateManager implements IRaftConnectionStateManager 
{
+
+    private static final String DEFAULT_REGION_ID = "--1";
+    private ConnectionState currentConnectionState;
+    private static final Duration CONNECT_STATE_CHECK_INTERVENE = 
Duration.ofSeconds(2);
+    private final RaftRegistryProperties properties;
+    private final List<ConnectionListener> connectionListeners = new 
CopyOnWriteArrayList<>();
+    private final ScheduledExecutorService scheduledExecutorService;
+    private final CliOptions cliOptions;
+    private final CliClientService cliClientService;
+
+    public RaftConnectionStateManager(RaftRegistryProperties properties) {
+        this.properties = properties;
+        this.cliOptions = new CliOptions();
+        this.cliOptions.setMaxRetry(3);
+        this.cliOptions.setTimeoutMs(5000);
+        this.cliClientService = new CliClientServiceImpl();
+        this.scheduledExecutorService = Executors.newScheduledThreadPool(
+                1,
+                new 
ThreadFactoryBuilder().setNameFormat("ConnectionStateRefreshThread").setDaemon(true).build());
+    }
+    @Override
+    public void start() {
+        cliClientService.init(cliOptions);
+        scheduledExecutorService.scheduleWithFixedDelay(
+                new ConnectionStateRefreshTask(connectionListeners),
+                CONNECT_STATE_CHECK_INTERVENE.toMillis(),
+                CONNECT_STATE_CHECK_INTERVENE.toMillis(),
+                TimeUnit.MILLISECONDS);
+    }
+    @Override
+    public void addConnectionListener(ConnectionListener listener) {
+        connectionListeners.add(listener);
+    }
+
+    @Override
+    public ConnectionState getConnectionState() {
+        return currentConnectionState;
+    }
+
+    class ConnectionStateRefreshTask implements Runnable {
+
+        private final List<ConnectionListener> connectionListeners;
+        ConnectionStateRefreshTask(List<ConnectionListener> 
connectionListeners) {
+            this.connectionListeners = connectionListeners;
+        }
+
+        @Override
+        public void run() {
+            try {
+                ConnectionState newConnectionState = 
getCurrentConnectionState();
+                if (newConnectionState == currentConnectionState) {
+                    // no state change
+                    return;
+                }
+                if (newConnectionState == ConnectionState.DISCONNECTED
+                        && currentConnectionState == 
ConnectionState.CONNECTED) {
+                    currentConnectionState = ConnectionState.DISCONNECTED;
+                    triggerListeners(ConnectionState.DISCONNECTED);
+                } else if (newConnectionState == ConnectionState.CONNECTED
+                        && currentConnectionState == 
ConnectionState.DISCONNECTED) {
+                    currentConnectionState = ConnectionState.CONNECTED;
+                    triggerListeners(ConnectionState.RECONNECTED);
+                } else if (currentConnectionState == null) {
+                    currentConnectionState = newConnectionState;
+                    triggerListeners(currentConnectionState);
+                }
+            } catch (Exception ex) {
+                log.error("raft registry connection state check failed", ex);
+                currentConnectionState = ConnectionState.DISCONNECTED;
+                triggerListeners(ConnectionState.DISCONNECTED);
+            }
+        }
+
+        private ConnectionState getCurrentConnectionState() {
+            try {
+                String groupId = properties.getClusterName() + 
DEFAULT_REGION_ID;
+                if (RouteTable.getInstance().refreshLeader(cliClientService, 
groupId, 2000).isOk()) {

Review Comment:
   done



##########
dolphinscheduler-registry/dolphinscheduler-registry-plugins/dolphinscheduler-registry-raft/src/main/java/org/apache/dolphinscheduler/plugin/registry/raft/RaftRegistryProperties.java:
##########
@@ -0,0 +1,51 @@
+/*
+ * 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.dolphinscheduler.plugin.registry.raft;
+
+import java.time.Duration;
+
+import lombok.Data;
+
+import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
+import org.springframework.boot.context.properties.ConfigurationProperties;
+import org.springframework.context.annotation.Configuration;
+
+@Data
+@Configuration
+@ConditionalOnProperty(prefix = "registry", name = "type", havingValue = 
"raft")
+@ConfigurationProperties(prefix = "registry")
+public class RaftRegistryProperties {
+
+    private String clusterName;
+    private String serverAddressList;
+    private String serverAddress;
+    private int serverPort;
+    private String logStorageDir;
+    private Duration distributedLockTimeout = Duration.ofSeconds(3);
+    private Duration distributedLockRetryInterval = Duration.ofSeconds(5);
+    private String module = "master";
+    private Duration listenerCheckInterval = Duration.ofSeconds(3);
+    private int cliMaxRetries = 3;
+    private Duration cliTimeout = Duration.ofSeconds(5);
+    private Duration refreshLeaderTimeout = Duration.ofSeconds(2);
+    private Duration connectStateCheckInterval = Duration.ofSeconds(2);
+    private Duration heartBeatTimeOut = Duration.ofSeconds(20);
+    private int subscribeListenerThreadPoolSize = 1;
+    private int connectionListenerThreadPoolSize = 1;

Review Comment:
   The following configurations are the JRaft component use.
   
       private String clusterName;
       private String serverAddressList;
       private String serverAddress;
       private int serverPort;
       private String logStorageDir;
       private Duration distributedLockTimeout = Duration.ofSeconds(3);
       private int cliMaxRetries = 3;
       private Duration cliTimeout = Duration.ofSeconds(5);
       private Duration refreshLeaderTimeout = Duration.ofSeconds(2);
   
   The following are some configurations we used ourselves. The previous 
CodeReview said not to use so many image numbers, so I put all of them here in 
the configuration.
   
       private Duration distributedLockRetryInterval = Duration.ofSeconds(5);
       private String module = "master";
       private Duration heartBeatTimeOut = Duration.ofSeconds(20);
       private Duration listenerCheckInterval = Duration.ofSeconds(3);
       private Duration connectStateCheckInterval = Duration.ofSeconds(2);
       private int subscribeListenerThreadPoolSize = 1;
       private int connectionListenerThreadPoolSize = 1;
   
   What should be done to make it better?  
   



##########
dolphinscheduler-registry/dolphinscheduler-registry-plugins/dolphinscheduler-registry-raft/src/main/java/org/apache/dolphinscheduler/plugin/registry/raft/RaftRegistry.java:
##########
@@ -0,0 +1,142 @@
+/*
+ * 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.dolphinscheduler.plugin.registry.raft;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+
+import org.apache.dolphinscheduler.common.thread.ThreadUtils;
+import 
org.apache.dolphinscheduler.plugin.registry.raft.client.IRaftRegisterClient;
+import 
org.apache.dolphinscheduler.plugin.registry.raft.client.RaftRegisterClient;
+import org.apache.dolphinscheduler.registry.api.ConnectionListener;
+import org.apache.dolphinscheduler.registry.api.Registry;
+import org.apache.dolphinscheduler.registry.api.RegistryException;
+import org.apache.dolphinscheduler.registry.api.SubscribeListener;
+
+import java.time.Duration;
+import java.util.Collection;
+
+import lombok.NonNull;
+import lombok.extern.slf4j.Slf4j;
+
+@Slf4j
+public class RaftRegistry implements Registry {
+
+    private static final long RECONNECT_WAIT_TIME_MS = 50L;

Review Comment:
   it has been defined as a constant and then used.



##########
dolphinscheduler-registry/dolphinscheduler-registry-plugins/dolphinscheduler-registry-raft/src/main/java/org/apache/dolphinscheduler/plugin/registry/raft/RaftRegistryAutoConfiguration.java:
##########
@@ -0,0 +1,72 @@
+/*
+ * 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.dolphinscheduler.plugin.registry.raft;
+
+import 
org.apache.dolphinscheduler.plugin.registry.raft.server.RaftRegistryServer;
+
+import lombok.extern.slf4j.Slf4j;
+
+import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
+import 
org.springframework.boot.context.properties.EnableConfigurationProperties;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.DependsOn;
+
+@Slf4j
+@Configuration(proxyBeanMethods = false)
+@ConditionalOnProperty(prefix = "registry", name = "type", havingValue = 
"raft")
+@EnableConfigurationProperties(RaftRegistryProperties.class)
+public class RaftRegistryAutoConfiguration {
+
+    public RaftRegistryAutoConfiguration() {
+        log.info("Load RaftRegistryAutoConfiguration");
+    }
+
+    @Bean
+    @ConditionalOnProperty(prefix = "registry", name = "module", havingValue = 
"master")
+    public RaftRegistryServer raftRegistryServer(RaftRegistryProperties 
raftRegistryProperties) {
+        RaftRegistryServer raftRegistryServer = new 
RaftRegistryServer(raftRegistryProperties);
+        raftRegistryServer.start();
+        return raftRegistryServer;
+    }
+
+    @Bean
+    @DependsOn("raftRegistryServer")
+    @ConditionalOnProperty(prefix = "registry", name = "module", havingValue = 
"master")
+    public RaftRegistry masterRaftRegistryClient(RaftRegistryProperties 
raftRegistryProperties) {
+        RaftRegistry raftRegistry = new RaftRegistry(raftRegistryProperties);
+        raftRegistry.start();
+        return raftRegistry;
+    }
+
+    @Bean
+    @ConditionalOnProperty(prefix = "registry", name = "module", havingValue = 
"worker")
+    public RaftRegistry workerRaftRegistryClient(RaftRegistryProperties 
raftRegistryProperties) {
+        RaftRegistry raftRegistry = new RaftRegistry(raftRegistryProperties);
+        raftRegistry.start();
+        return raftRegistry;
+    }
+
+    @Bean
+    @ConditionalOnProperty(prefix = "registry", name = "module", havingValue = 
"api")
+    public RaftRegistry apiRaftRegistryClient(RaftRegistryProperties 
raftRegistryProperties) {
+        RaftRegistry raftRegistry = new RaftRegistry(raftRegistryProperties);
+        raftRegistry.start();
+        return raftRegistry;
+    }

Review Comment:
   I want to achieve is that the master start the client and server of raft, 
while other modules only need to start the client of raft. Is there a better 
way to achieve this?



##########
dolphinscheduler-registry/dolphinscheduler-registry-plugins/dolphinscheduler-registry-raft/src/main/java/org/apache/dolphinscheduler/plugin/registry/raft/client/RaftRegistryClient.java:
##########
@@ -0,0 +1,221 @@
+/*
+ * 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.dolphinscheduler.plugin.registry.raft.client;
+
+import static com.alipay.sofa.jraft.util.BytesUtil.readUtf8;
+import static com.alipay.sofa.jraft.util.BytesUtil.writeUtf8;
+
+import org.apache.dolphinscheduler.common.constants.Constants;
+import org.apache.dolphinscheduler.plugin.registry.raft.RaftRegistryProperties;
+import 
org.apache.dolphinscheduler.plugin.registry.raft.manage.IRaftConnectionStateManager;
+import 
org.apache.dolphinscheduler.plugin.registry.raft.manage.IRaftLockManager;
+import 
org.apache.dolphinscheduler.plugin.registry.raft.manage.IRaftSubscribeDataManager;
+import 
org.apache.dolphinscheduler.plugin.registry.raft.manage.RaftConnectionStateManager;
+import org.apache.dolphinscheduler.plugin.registry.raft.manage.RaftLockManager;
+import 
org.apache.dolphinscheduler.plugin.registry.raft.manage.RaftSubscribeDataManager;
+import org.apache.dolphinscheduler.plugin.registry.raft.model.NodeType;
+import org.apache.dolphinscheduler.registry.api.ConnectionListener;
+import org.apache.dolphinscheduler.registry.api.ConnectionState;
+import org.apache.dolphinscheduler.registry.api.RegistryException;
+import org.apache.dolphinscheduler.registry.api.SubscribeListener;
+import org.apache.dolphinscheduler.registry.api.enums.RegistryNodeType;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.List;
+
+import lombok.extern.slf4j.Slf4j;
+
+import com.alipay.sofa.jraft.rhea.client.DefaultRheaKVStore;
+import com.alipay.sofa.jraft.rhea.client.RheaKVStore;
+import com.alipay.sofa.jraft.rhea.options.PlacementDriverOptions;
+import com.alipay.sofa.jraft.rhea.options.RegionRouteTableOptions;
+import com.alipay.sofa.jraft.rhea.options.RheaKVStoreOptions;
+import 
com.alipay.sofa.jraft.rhea.options.configured.MultiRegionRouteTableOptionsConfigured;
+import 
com.alipay.sofa.jraft.rhea.options.configured.PlacementDriverOptionsConfigured;
+import 
com.alipay.sofa.jraft.rhea.options.configured.RheaKVStoreOptionsConfigured;
+import com.alipay.sofa.jraft.rhea.storage.KVEntry;
+
+@Slf4j
+public class RaftRegistryClient implements IRaftRegistryClient {
+
+    private final RheaKVStore rheaKvStore;
+    private final RaftRegistryProperties raftRegistryProperties;
+    private final IRaftConnectionStateManager raftConnectionStateManager;
+    private final IRaftSubscribeDataManager raftSubscribeDataManager;
+    private final IRaftLockManager raftLockManager;
+    private volatile boolean started;
+    private static final String MASTER_MODULE = "master";
+    public RaftRegistryClient(RaftRegistryProperties raftRegistryProperties) {
+        this.raftRegistryProperties = raftRegistryProperties;
+        this.rheaKvStore = new DefaultRheaKVStore();
+        this.raftConnectionStateManager = new 
RaftConnectionStateManager(raftRegistryProperties);
+        this.raftSubscribeDataManager = new 
RaftSubscribeDataManager(raftRegistryProperties, rheaKvStore);
+        this.raftLockManager = new RaftLockManager(rheaKvStore, 
raftRegistryProperties);
+
+        initRheakv();
+    }
+
+    private void initRheakv() {
+        final List<RegionRouteTableOptions> regionRouteTableOptionsList = 
MultiRegionRouteTableOptionsConfigured
+                .newConfigured()
+                .withInitialServerList(-1L /* default id */, 
raftRegistryProperties.getServerAddressList())
+                .config();
+        final PlacementDriverOptions pdOpts = 
PlacementDriverOptionsConfigured.newConfigured()
+                .withFake(true)
+                .withRegionRouteTableOptionsList(regionRouteTableOptionsList)
+                .config();
+        final RheaKVStoreOptions opts = 
RheaKVStoreOptionsConfigured.newConfigured() //
+                .withClusterName(raftRegistryProperties.getClusterName()) //
+                .withPlacementDriverOptions(pdOpts) //
+                .config();
+        this.rheaKvStore.init(opts);
+    }
+
+    @Override
+    public void start() {
+        if (this.started) {
+            log.info("RaftRegistryClient is already started");
+            return;
+        }
+        log.info("starting raft client registry...");
+        if (raftRegistryProperties.getModule().equals(MASTER_MODULE)) {
+            raftSubscribeDataManager.start();
+        }

Review Comment:
   In my understanding, only the master listens for changes in the registered 
instances



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