RIP-7 Multiple Directories Storage Suppor

broker/src/main/java/org/apache/rocketmq/broker/processor/SendMessageProcessor.java

@@ -56,6 +56,7 @@ import org.apache.rocketmq.remoting.netty.RemotingResponseCallback;
 import org.apache.rocketmq.remoting.protocol.RemotingCommand;
 import org.apache.rocketmq.store.MessageExtBrokerInner;
 import org.apache.rocketmq.store.PutMessageResult;
+import org.apache.rocketmq.store.config.MessageStoreConfig;
 import org.apache.rocketmq.store.config.StorePathConfigHelper;
 import org.apache.rocketmq.store.stats.BrokerStatsManager;
 
@@ -186,7 +187,7 @@ public class SendMessageProcessor extends AbstractSendMessageProcessor implement
             }
         }
 
-        if (msgExt.getReconsumeTimes() >= maxReconsumeTimes 
+        if (msgExt.getReconsumeTimes() >= maxReconsumeTimes
             || delayLevel < 0) {
             newTopic = MixAll.getDLQTopic(requestHeader.getGroup());
             queueIdInt = ThreadLocalRandom.current().nextInt(99999999) % DLQ_NUMS_PER_GROUP;
@@ -635,8 +636,16 @@ public class SendMessageProcessor extends AbstractSendMessageProcessor implement
     }
 
     private String diskUtil() {
-        String storePathPhysic = this.brokerController.getMessageStoreConfig().getStorePathCommitLog();
-        double physicRatio = UtilAll.getDiskPartitionSpaceUsedPercent(storePathPhysic);
+        double physicRatio = -1;
+        String storePath =this.brokerController.getMessageStoreConfig().getStorePathCommitLog();
+        if (storePath.contains(MessageStoreConfig.MULTI_PATH_SPLITTER)) {
+            String[] paths = storePath.trim().split(MessageStoreConfig.MULTI_PATH_SPLITTER);
+            for (String storePathPhysic : paths) {
+                physicRatio = Math.min(physicRatio, UtilAll.getDiskPartitionSpaceUsedPercent(storePathPhysic));
+            }
+        } else {
+            physicRatio = UtilAll.getDiskPartitionSpaceUsedPercent(storePath);
+        }
 
         String storePathLogis =
             StorePathConfigHelper.getStorePathConsumeQueue(this.brokerController.getMessageStoreConfig().getStorePathRootDir());

store/src/main/java/org/apache/rocketmq/store/CommitLog.java

@@ -22,10 +22,12 @@ import java.net.InetAddress;
 import java.net.InetSocketAddress;
 import java.net.SocketAddress;
 import java.nio.ByteBuffer;
+import java.util.Collections;
 import java.util.HashMap;
 import java.util.LinkedList;
 import java.util.List;
 import java.util.Map;
+import java.util.Set;
 import java.util.concurrent.CompletableFuture;
 import java.util.function.Supplier;
 
@@ -43,6 +45,7 @@ import org.apache.rocketmq.logging.InternalLogger;
 import org.apache.rocketmq.logging.InternalLoggerFactory;
 import org.apache.rocketmq.store.config.BrokerRole;
 import org.apache.rocketmq.store.config.FlushDiskType;
+import org.apache.rocketmq.store.config.MessageStoreConfig;
 import org.apache.rocketmq.store.ha.HAService;
 import org.apache.rocketmq.store.schedule.ScheduleMessageService;
 
@@ -71,9 +74,20 @@ public class CommitLog {
 
     protected final PutMessageLock putMessageLock;
 
+    private volatile Set<String> fullStorePaths = Collections.emptySet();
+
     public CommitLog(final DefaultMessageStore defaultMessageStore) {
-        this.mappedFileQueue = new MappedFileQueue(defaultMessageStore.getMessageStoreConfig().getStorePathCommitLog(),
-            defaultMessageStore.getMessageStoreConfig().getMappedFileSizeCommitLog(), defaultMessageStore.getAllocateMappedFileService());
+        String storePath = defaultMessageStore.getMessageStoreConfig().getStorePathCommitLog();
+        if (storePath.contains(MessageStoreConfig.MULTI_PATH_SPLITTER)) {
+            this.mappedFileQueue = new MultiPathMappedFileQueue(defaultMessageStore.getMessageStoreConfig(),
+                    defaultMessageStore.getMessageStoreConfig().getMappedFileSizeCommitLog(),
+                    defaultMessageStore.getAllocateMappedFileService(), this::getFullStorePaths);
+        } else {
+            this.mappedFileQueue = new MappedFileQueue(storePath,
+                    defaultMessageStore.getMessageStoreConfig().getMappedFileSizeCommitLog(),
+                    defaultMessageStore.getAllocateMappedFileService());
+        }
+
         this.defaultMessageStore = defaultMessageStore;
 
         if (FlushDiskType.SYNC_FLUSH == defaultMessageStore.getMessageStoreConfig().getFlushDiskType()) {
@@ -95,6 +109,14 @@ public class CommitLog {
 
     }
 
+    public void setFullStorePaths(Set<String> fullStorePaths) {
+        this.fullStorePaths = fullStorePaths;
+    }
+
+    public Set<String> getFullStorePaths() {
+        return fullStorePaths;
+    }
+
     public boolean load() {
         boolean result = this.mappedFileQueue.load();
         log.info("load commit log " + (result ? "OK" : "Failed"));

store/src/main/java/org/apache/rocketmq/store/DefaultMessageStore.java

@@ -26,6 +26,7 @@ import java.nio.ByteBuffer;
 import java.nio.channels.FileLock;
 import java.util.Collections;
 import java.util.HashMap;
+import java.util.HashSet;
 import java.util.Iterator;
 import java.util.LinkedList;
 import java.util.Map;
@@ -782,10 +783,20 @@ public class DefaultMessageStore implements MessageStore {
     public HashMap<String, String> getRuntimeInfo() {
         HashMap<String, String> result = this.storeStatsService.getRuntimeInfo();
 
-        {
-            double physicRatio = UtilAll.getDiskPartitionSpaceUsedPercent(getStorePathPhysic());
+        String commitLogStorePath = DefaultMessageStore.this.getMessageStoreConfig().getStorePathCommitLog();
+        if (commitLogStorePath.contains(MessageStoreConfig.MULTI_PATH_SPLITTER)) {
+            double maxValue = Double.MIN_VALUE;
+            String[] paths = commitLogStorePath.trim().split(MessageStoreConfig.MULTI_PATH_SPLITTER);
+            for (String clPath : paths) {
+                double physicRatio = UtilAll.getDiskPartitionSpaceUsedPercent(clPath);
+                result.put(RunningStats.commitLogDiskRatio.name() + "_" + clPath, String.valueOf(physicRatio));
+                maxValue = Math.max(maxValue, physicRatio);
+            }
+            result.put(RunningStats.commitLogDiskRatio.name(), String.valueOf(maxValue));
+        } else {
+            String storePathPhysic = DefaultMessageStore.this.getMessageStoreConfig().getStorePathCommitLog();
+            double physicRatio = UtilAll.getDiskPartitionSpaceUsedPercent(storePathPhysic);
             result.put(RunningStats.commitLogDiskRatio.name(), String.valueOf(physicRatio));
-
         }
 
         {
@@ -1650,25 +1661,49 @@ public class DefaultMessageStore implements MessageStore {
             cleanImmediately = false;
 
             {
-                double physicRatio = UtilAll.getDiskPartitionSpaceUsedPercent(getStorePathPhysic());
-                if (physicRatio > diskSpaceWarningLevelRatio) {
+                String[] storePaths;
+                String commitLogStorePath = DefaultMessageStore.this.getMessageStoreConfig().getStorePathCommitLog();
+                if (commitLogStorePath.contains(MessageStoreConfig.MULTI_PATH_SPLITTER)) {
+                    storePaths = commitLogStorePath.trim().split(MessageStoreConfig.MULTI_PATH_SPLITTER);
+                } else {
+                    storePaths = new String[]{commitLogStorePath};
+                }
+
+                Set<String> fullStorePath = new HashSet<>();
+                double minPhysicRatio = 100;
+                String minStorePath = null;
+                for (String storePathPhysic : storePaths) {
+                    double physicRatio = UtilAll.getDiskPartitionSpaceUsedPercent(storePathPhysic);
+                    if (minPhysicRatio > physicRatio) {
+                        minPhysicRatio =  physicRatio;
+                        minStorePath = storePathPhysic;
+                    }
+                    if (physicRatio > diskSpaceCleanForciblyRatio) {
+                        fullStorePath.add(storePathPhysic);
+                    }
+                }
+                DefaultMessageStore.this.commitLog.setFullStorePaths(fullStorePath);
+                if (minPhysicRatio > diskSpaceWarningLevelRatio) {
                     boolean diskok = DefaultMessageStore.this.runningFlags.getAndMakeDiskFull();
                     if (diskok) {
-                        DefaultMessageStore.log.error("physic disk maybe full soon " + physicRatio + ", so mark disk full");
+                        DefaultMessageStore.log.error("physic disk maybe full soon " + minPhysicRatio +
+                                ", so mark disk full, storePathPhysic=" + minStorePath);
                     }
 
                     cleanImmediately = true;
-                } else if (physicRatio > diskSpaceCleanForciblyRatio) {
+                } else if (minPhysicRatio > diskSpaceCleanForciblyRatio) {
                     cleanImmediately = true;
                 } else {
                     boolean diskok = DefaultMessageStore.this.runningFlags.getAndMakeDiskOK();
                     if (!diskok) {
-                        DefaultMessageStore.log.info("physic disk space OK " + physicRatio + ", so mark disk ok");
+                        DefaultMessageStore.log.info("physic disk space OK " + minPhysicRatio +
+                                ", so mark disk ok, storePathPhysic=" + minStorePath);
                     }
                 }
 
-                if (physicRatio < 0 || physicRatio > ratio) {
-                    DefaultMessageStore.log.info("physic disk maybe full soon, so reclaim space, " + physicRatio);
+                if (minPhysicRatio < 0 || minPhysicRatio > ratio) {
+                    DefaultMessageStore.log.info("physic disk maybe full soon, so reclaim space, "
+                            + minPhysicRatio + ", storePathPhysic=" + minStorePath);
                     return true;
                 }
             }

store/src/main/java/org/apache/rocketmq/store/MappedFileQueue.java

@@ -20,6 +20,7 @@ import java.io.File;
 import java.io.IOException;
 import java.util.ArrayList;
 import java.util.Arrays;
+import java.util.Collections;
 import java.util.Iterator;
 import java.util.List;
 import java.util.ListIterator;
@@ -37,13 +38,13 @@ public class MappedFileQueue {
 
     private final String storePath;
 
-    private final int mappedFileSize;
+    protected final int mappedFileSize;
 
-    private final CopyOnWriteArrayList<MappedFile> mappedFiles = new CopyOnWriteArrayList<MappedFile>();
+    protected final CopyOnWriteArrayList<MappedFile> mappedFiles = new CopyOnWriteArrayList<MappedFile>();
 
     private final AllocateMappedFileService allocateMappedFileService;
 
-    private long flushedWhere = 0;
+    protected long flushedWhere = 0;
     private long committedWhere = 0;
 
     private volatile long storeTimestamp = 0;
@@ -144,35 +145,39 @@ public class MappedFileQueue {
         }
     }
 
+
     public boolean load() {
         File dir = new File(this.storePath);
-        File[] files = dir.listFiles();
-        if (files != null) {
-            // ascending order
-            Arrays.sort(files);
-            for (File file : files) {
-
-                if (file.length() != this.mappedFileSize) {
-                    log.warn(file + "\t" + file.length()
-                        + " length not matched message store config value, please check it manually");
-                    return false;
-                }
+        File[] ls = dir.listFiles();
+        if (ls != null) {
+            return doLoad(Arrays.asList(ls));
+        }
+        return true;
+    }
 
-                try {
-                    MappedFile mappedFile = new MappedFile(file.getPath(), mappedFileSize);
-
-                    mappedFile.setWrotePosition(this.mappedFileSize);
-                    mappedFile.setFlushedPosition(this.mappedFileSize);
-                    mappedFile.setCommittedPosition(this.mappedFileSize);
-                    this.mappedFiles.add(mappedFile);
-                    log.info("load " + file.getPath() + " OK");
-                } catch (IOException e) {
-                    log.error("load file " + file + " error", e);
-                    return false;
-                }
+    public boolean doLoad(List<File> files) {
+        // ascending order
+        Collections.sort(files);
+        for (File file : files) {
+            if (file.length() != this.mappedFileSize) {
+                log.warn(file + "\t" + file.length()
+                        + " length not matched message store config value, ignore it");
+                return true;
             }
-        }
 
+            try {
+                MappedFile mappedFile = new MappedFile(file.getPath(), mappedFileSize);
+
+                mappedFile.setWrotePosition(this.mappedFileSize);
+                mappedFile.setFlushedPosition(this.mappedFileSize);
+                mappedFile.setCommittedPosition(this.mappedFileSize);
+                this.mappedFiles.add(mappedFile);
+                log.info("load " + file.getPath() + " OK");
+            } catch (IOException e) {
+                log.error("load file " + file + " error", e);
+                return false;
+            }
+        }
         return true;
     }
 
@@ -204,33 +209,41 @@ public class MappedFileQueue {
         }
 
         if (createOffset != -1 && needCreate) {
-            String nextFilePath = this.storePath + File.separator + UtilAll.offset2FileName(createOffset);
-            String nextNextFilePath = this.storePath + File.separator
-                + UtilAll.offset2FileName(createOffset + this.mappedFileSize);
-            MappedFile mappedFile = null;
+            return tryCreateMappedFile(createOffset);
+        }
+
+        return mappedFileLast;
+    }
+
+    protected MappedFile tryCreateMappedFile(long createOffset) {
+        String nextFilePath = this.storePath + File.separator + UtilAll.offset2FileName(createOffset);
+        String nextNextFilePath = this.storePath + File.separator + UtilAll.offset2FileName(createOffset
+                + this.mappedFileSize);
+        return doCreateMappedFile(nextFilePath, nextNextFilePath);
+    }
 
-            if (this.allocateMappedFileService != null) {
-                mappedFile = this.allocateMappedFileService.putRequestAndReturnMappedFile(nextFilePath,
+    protected MappedFile doCreateMappedFile(String nextFilePath, String nextNextFilePath) {
+        MappedFile mappedFile = null;
+
+        if (this.allocateMappedFileService != null) {
+            mappedFile = this.allocateMappedFileService.putRequestAndReturnMappedFile(nextFilePath,
                     nextNextFilePath, this.mappedFileSize);
-            } else {
-                try {
-                    mappedFile = new MappedFile(nextFilePath, this.mappedFileSize);
-                } catch (IOException e) {
-                    log.error("create mappedFile exception", e);
-                }
+        } else {
+            try {
+                mappedFile = new MappedFile(nextFilePath, this.mappedFileSize);
+            } catch (IOException e) {
+                log.error("create mappedFile exception", e);
             }
+        }
 
-            if (mappedFile != null) {
-                if (this.mappedFiles.isEmpty()) {
-                    mappedFile.setFirstCreateInQueue(true);
-                }
-                this.mappedFiles.add(mappedFile);
+        if (mappedFile != null) {
+            if (this.mappedFiles.isEmpty()) {
+                mappedFile.setFirstCreateInQueue(true);
             }
-
-            return mappedFile;
+            this.mappedFiles.add(mappedFile);
         }
 
-        return mappedFileLast;
+        return mappedFile;
     }
 
     public MappedFile getLastMappedFile(final long startOffset) {
@@ -398,7 +411,7 @@ public class MappedFileQueue {
                     destroy = maxOffsetInLogicQueue < offset;
                     if (destroy) {
                         log.info("physic min offset " + offset + ", logics in current mappedFile max offset "
-                            + maxOffsetInLogicQueue + ", delete it");
+                                + maxOffsetInLogicQueue + ", delete it");
                     }
                 } else if (!mappedFile.isAvailable()) { // Handle hanged file.
                     log.warn("Found a hanged consume queue file, attempting to delete it.");
@@ -466,7 +479,7 @@ public class MappedFileQueue {
             if (firstMappedFile != null && lastMappedFile != null) {
                 if (offset < firstMappedFile.getFileFromOffset() || offset >= lastMappedFile.getFileFromOffset() + this.mappedFileSize) {
                     LOG_ERROR.warn("Offset not matched. Request offset: {}, firstOffset: {}, lastOffset: {}, mappedFileSize: {}, mappedFiles count: {}",
-                        offset,
+                            offset,
                         firstMappedFile.getFileFromOffset(),
                         lastMappedFile.getFileFromOffset() + this.mappedFileSize,
                         this.mappedFileSize,
@@ -480,7 +493,7 @@ public class MappedFileQueue {
                     }
 
                     if (targetFile != null && offset >= targetFile.getFileFromOffset()
-                        && offset < targetFile.getFileFromOffset() + this.mappedFileSize) {
+                            && offset < targetFile.getFileFromOffset() + this.mappedFileSize) {
                         return targetFile;
                     }
 

store/src/main/java/org/apache/rocketmq/store/MultiPathMappedFileQueue.java

+/*
+ * 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.rocketmq.store;
+
+
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.HashSet;
+import java.util.Set;
+import java.util.function.Supplier;
+import org.apache.commons.lang3.StringUtils;
+import org.apache.rocketmq.common.UtilAll;
+import org.apache.rocketmq.store.config.MessageStoreConfig;
+
+import java.io.File;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+
+public class MultiPathMappedFileQueue extends MappedFileQueue {
+
+    private final MessageStoreConfig config;
+    private final Supplier<Set<String>> fullStorePathsSupplier;
+
+    public MultiPathMappedFileQueue(MessageStoreConfig messageStoreConfig, int mappedFileSize,
+                                    AllocateMappedFileService allocateMappedFileService,
+                                    Supplier<Set<String>> fullStorePathsSupplier) {
+        super(messageStoreConfig.getStorePathCommitLog(), mappedFileSize, allocateMappedFileService);
+        this.config = messageStoreConfig;
+        this.fullStorePathsSupplier = fullStorePathsSupplier;
+    }
+
+    private Set<String> getPaths() {
+        String[] paths = config.getStorePathCommitLog().trim().split(MessageStoreConfig.MULTI_PATH_SPLITTER);
+        return new HashSet<>(Arrays.asList(paths));
+    }
+
+    private Set<String> getReadonlyPaths() {
+        String pathStr = config.getReadOnlyCommitLogStorePaths();
+        if (StringUtils.isBlank(pathStr)) {
+            return Collections.emptySet();
+        }
+        String[] paths = pathStr.trim().split(MessageStoreConfig.MULTI_PATH_SPLITTER);
+        return new HashSet<>(Arrays.asList(paths));
+    }
+
+    @Override
+    public boolean load() {
+        Set<String> storePathSet = getPaths();
+        storePathSet.addAll(getReadonlyPaths());
+
+        List<File> files = new ArrayList<>();
+        for (String path : storePathSet) {
+            File dir = new File(path);
+            File[] ls = dir.listFiles();
+            if (ls != null) {
+                Collections.addAll(files, ls);
+            }
+        }
+
+        return doLoad(files);
+    }
+
+    @Override
+    protected MappedFile tryCreateMappedFile(long createOffset) {
+        long fileIdx = createOffset / this.mappedFileSize;
+        Set<String> storePath = getPaths();
+        Set<String> readonlyPathSet = getReadonlyPaths();
+        Set<String> fullStorePaths =
+                fullStorePathsSupplier == null ? Collections.emptySet() : fullStorePathsSupplier.get();
+
+
+        HashSet<String> availableStorePath = new HashSet<>(storePath);
+        //do not create file in readonly store path.
+        availableStorePath.removeAll(readonlyPathSet);
+
+        //do not create file is space is nearly full.
+        availableStorePath.removeAll(fullStorePaths);
+
+        //if no store path left, fall back to wriable store path.
+        if (availableStorePath.isEmpty()) {
+            availableStorePath = new HashSet<>(storePath);
+            availableStorePath.removeAll(readonlyPathSet);
+        }
+
+        String[] paths = availableStorePath.toArray(new String[]{});
+        Arrays.sort(paths);
+        String nextFilePath = paths[(int) (fileIdx % paths.length)] + File.separator
+                + UtilAll.offset2FileName(createOffset);
+        String nextNextFilePath = paths[(int) ((fileIdx + 1) % paths.length)] + File.separator
+                + UtilAll.offset2FileName(createOffset + this.mappedFileSize);
+        return doCreateMappedFile(nextFilePath, nextNextFilePath);
+    }
+
+    @Override
+    public void destroy() {
+        for (MappedFile mf : this.mappedFiles) {
+            mf.destroy(1000 * 3);
+        }
+        this.mappedFiles.clear();
+        this.flushedWhere = 0;
+
+
+        Set<String> storePathSet = getPaths();
+        storePathSet.addAll(getReadonlyPaths());
+
+        for (String path : storePathSet) {
+            File file = new File(path);
+            if (file.isDirectory()) {
+                file.delete();
+            }
+        }
+    }
+}

store/src/main/java/org/apache/rocketmq/store/config/MessageStoreConfig.java

@@ -17,10 +17,17 @@
 package org.apache.rocketmq.store.config;
 
 import java.io.File;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.List;
+
 import org.apache.rocketmq.common.annotation.ImportantField;
 import org.apache.rocketmq.store.ConsumeQueue;
 
 public class MessageStoreConfig {
+
+    public static final String MULTI_PATH_SPLITTER = ":";
+
     //The root directory in which the log data is kept
     @ImportantField
     private String storePathRootDir = System.getProperty("user.home") + File.separator + "store";
@@ -30,6 +37,8 @@ public class MessageStoreConfig {
     private String storePathCommitLog = System.getProperty("user.home") + File.separator + "store"
         + File.separator + "commitlog";
 
+    private String readOnlyCommitLogStorePaths = null;
+
     // CommitLog file size,default is 1G
     private int mappedFileSizeCommitLog = 1024 * 1024 * 1024;
     // ConsumeQueue file size,default is 30W
@@ -676,6 +685,13 @@ public class MessageStoreConfig {
         this.commitCommitLogThoroughInterval = commitCommitLogThoroughInterval;
     }
 
+    public String getReadOnlyCommitLogStorePaths() {
+        return readOnlyCommitLogStorePaths;
+    }
+
+    public void setReadOnlyCommitLogStorePaths(String readOnlyCommitLogStorePaths) {
+        this.readOnlyCommitLogStorePaths = readOnlyCommitLogStorePaths;
+    }
     public String getdLegerGroup() {
         return dLegerGroup;
     }

store/src/test/java/org/apache/rocketmq/store/MultiPathMappedFileQueueTest.java

+/*
+ * 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.rocketmq.store;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import java.util.HashSet;
+import java.util.Set;
+import org.apache.rocketmq.store.config.MessageStoreConfig;
+import org.junit.Test;
+
+
+public class MultiPathMappedFileQueueTest {
+
+    @Test
+    public void testGetLastMappedFile() {
+        final byte[] fixedMsg = new byte[1024];
+
+        MessageStoreConfig config = new MessageStoreConfig();
+        config.setStorePathCommitLog("target/unit_test_store/a/:target/unit_test_store/b/:target/unit_test_store/c/");
+        MappedFileQueue mappedFileQueue = new MultiPathMappedFileQueue(config, 1024, null, null);
+        String[] storePaths = config.getStorePathCommitLog().trim().split(MessageStoreConfig.MULTI_PATH_SPLITTER);
+        for (int i = 0; i < 1024; i++) {
+            MappedFile mappedFile = mappedFileQueue.getLastMappedFile(fixedMsg.length * i);
+            assertThat(mappedFile).isNotNull();
+            assertThat(mappedFile.appendMessage(fixedMsg)).isTrue();
+            int idx = i % storePaths.length;
+            assertThat(mappedFile.getFileName().startsWith(storePaths[idx])).isTrue();
+        }
+        mappedFileQueue.shutdown(1000);
+        mappedFileQueue.destroy();
+    }
+
+    @Test
+    public void testLoadReadOnlyMappedFiles() {
+        {
+            //create old mapped files
+            final byte[] fixedMsg = new byte[1024];
+            MessageStoreConfig config = new MessageStoreConfig();
+            config.setStorePathCommitLog(
+                    "target/unit_test_store/a/:target/unit_test_store/b/:target/unit_test_store/c/");
+            MappedFileQueue mappedFileQueue = new MultiPathMappedFileQueue(config, 1024, null, null);
+            String[] storePaths = config.getStorePathCommitLog().trim().split(MessageStoreConfig.MULTI_PATH_SPLITTER);
+            for (int i = 0; i < 1024; i++) {
+                MappedFile mappedFile = mappedFileQueue.getLastMappedFile(fixedMsg.length * i);
+                assertThat(mappedFile).isNotNull();
+                assertThat(mappedFile.appendMessage(fixedMsg)).isTrue();
+                int idx = i % storePaths.length;
+                assertThat(mappedFile.getFileName().startsWith(storePaths[idx])).isTrue();
+            }
+            mappedFileQueue.shutdown(1000);
+        }
+
+        // test load and readonly
+        MessageStoreConfig config = new MessageStoreConfig();
+        config.setStorePathCommitLog("target/unit_test_store/b/");
+        config.setReadOnlyCommitLogStorePaths("target/unit_test_store/a:target/unit_test_store/c");
+        MultiPathMappedFileQueue mappedFileQueue = new MultiPathMappedFileQueue(config, 1024, null, null);
+
+        mappedFileQueue.load();
+
+        assertThat(mappedFileQueue.mappedFiles.size()).isEqualTo(1025);
+        mappedFileQueue.destroy();
+
+    }
+
+    @Test
+    public void testUpdatePathsOnline() {
+        final byte[] fixedMsg = new byte[1024];
+
+        MessageStoreConfig config = new MessageStoreConfig();
+        config.setStorePathCommitLog("target/unit_test_store/a/:target/unit_test_store/b/:target/unit_test_store/c/");
+        MappedFileQueue mappedFileQueue = new MultiPathMappedFileQueue(config, 1024, null, null);
+        String[] storePaths = config.getStorePathCommitLog().trim().split(MessageStoreConfig.MULTI_PATH_SPLITTER);
+        for (int i = 0; i < 1024; i++) {
+            MappedFile mappedFile = mappedFileQueue.getLastMappedFile(fixedMsg.length * i);
+            assertThat(mappedFile).isNotNull();
+            assertThat(mappedFile.appendMessage(fixedMsg)).isTrue();
+            int idx = i % storePaths.length;
+            assertThat(mappedFile.getFileName().startsWith(storePaths[idx])).isTrue();
+
+            if (i == 500) {
+                config.setStorePathCommitLog("target/unit_test_store/a/:target/unit_test_store/b/");
+                storePaths = config.getStorePathCommitLog().trim().split(MessageStoreConfig.MULTI_PATH_SPLITTER);
+            }
+        }
+        mappedFileQueue.shutdown(1000);
+        mappedFileQueue.destroy();
+    }
+
+    @Test
+    public void testFullStorePath() {
+        final byte[] fixedMsg = new byte[1024];
+
+        Set<String> fullStorePath = new HashSet<>();
+        MessageStoreConfig config = new MessageStoreConfig();
+        config.setStorePathCommitLog("target/unit_test_store/a/:target/unit_test_store/b/:target/unit_test_store/c/");
+        MappedFileQueue mappedFileQueue = new MultiPathMappedFileQueue(config, 1024, null, () -> fullStorePath);
+        String[] storePaths = config.getStorePathCommitLog().trim().split(MessageStoreConfig.MULTI_PATH_SPLITTER);
+        assertThat(storePaths.length).isEqualTo(3);
+
+        MappedFile mappedFile = mappedFileQueue.getLastMappedFile(0);
+        assertThat(mappedFile).isNotNull();
+        assertThat(mappedFile.appendMessage(fixedMsg)).isTrue();
+        assertThat(mappedFile.getFileName().startsWith(storePaths[0])).isTrue();
+
+        mappedFile = mappedFileQueue.getLastMappedFile(fixedMsg.length);
+        assertThat(mappedFile.getFileName().startsWith(storePaths[1])).isTrue();
+        assertThat(mappedFile.appendMessage(fixedMsg)).isTrue();
+        mappedFile = mappedFileQueue.getLastMappedFile(fixedMsg.length * 2);
+        assertThat(mappedFile.appendMessage(fixedMsg)).isTrue();
+        assertThat(mappedFile.getFileName().startsWith(storePaths[2])).isTrue();
+
+        fullStorePath.add("target/unit_test_store/b/");
+        mappedFile = mappedFileQueue.getLastMappedFile(fixedMsg.length * 3);
+        assertThat(mappedFile.appendMessage(fixedMsg)).isTrue();
+        assertThat(mappedFile.getFileName().startsWith(storePaths[2])).isTrue();
+
+        mappedFile = mappedFileQueue.getLastMappedFile(fixedMsg.length * 4);
+        assertThat(mappedFile.appendMessage(fixedMsg)).isTrue();
+        assertThat(mappedFile.getFileName().startsWith(storePaths[0])).isTrue();
+
+        mappedFileQueue.shutdown(1000);
+        mappedFileQueue.destroy();
+    }
+}
\ No newline at end of file