From fde0f8077083a11a86eccd6dfe7259e88bf8e8f2 Mon Sep 17 00:00:00 2001
From: Hankunming <1109939087@qq.com>
Date: Thu, 27 Jul 2023 20:09:19 +0800
Subject: [PATCH] fix:consumer offset compatible problem caused by
 LmqConsumerOffsetManager

---
 .../offset/LmqConsumerOffsetManager.java      | 90 +++++++++++++++++++
 .../apache/rocketmq/common/ConfigManager.java |  2 +-
 2 files changed, 91 insertions(+), 1 deletion(-)

diff --git a/broker/src/main/java/org/apache/rocketmq/broker/offset/LmqConsumerOffsetManager.java b/broker/src/main/java/org/apache/rocketmq/broker/offset/LmqConsumerOffsetManager.java
index ce70b1a820f..5f1ad578a26 100644
--- a/broker/src/main/java/org/apache/rocketmq/broker/offset/LmqConsumerOffsetManager.java
+++ b/broker/src/main/java/org/apache/rocketmq/broker/offset/LmqConsumerOffsetManager.java
@@ -23,9 +23,13 @@
 import org.apache.rocketmq.broker.BrokerController;
 import org.apache.rocketmq.broker.BrokerPathConfigHelper;
 import org.apache.rocketmq.common.MixAll;
+import org.apache.rocketmq.common.constant.LoggerName;
+import org.apache.rocketmq.logging.org.slf4j.Logger;
+import org.apache.rocketmq.logging.org.slf4j.LoggerFactory;
 import org.apache.rocketmq.remoting.protocol.RemotingSerializable;
 
 public class LmqConsumerOffsetManager extends ConsumerOffsetManager {
+    private static final Logger log = LoggerFactory.getLogger(LoggerName.BROKER_LOGGER_NAME);
     private ConcurrentHashMap<String, Long> lmqOffsetTable = new ConcurrentHashMap<>(512);
 
     public LmqConsumerOffsetManager() {
@@ -36,6 +40,92 @@ public LmqConsumerOffsetManager(BrokerController brokerController) {
         super(brokerController);
     }
 
+    @Override
+    public boolean load() {
+        String fileName = null;
+        try {
+            fileName = this.configFilePath();
+            String jsonString = MixAll.file2String(fileName);
+
+            if (null == jsonString || jsonString.length() == 0) {
+                if (!this.loadBak()) {
+                    return loadOldVersionConsumerOffset();
+                }
+            } else {
+                this.decode(jsonString);
+                log.info("load " + fileName + " OK");
+                return true;
+            }
+        } catch (Exception e) {
+            log.error("load " + fileName + " failed, and try to load backup file", e);
+            return this.loadBak();
+        }
+        return true;
+    }
+
+    @Override
+    protected boolean loadBak() {
+        String fileName = null;
+        try {
+            fileName = this.configFilePath();
+            String jsonString = MixAll.file2String(fileName + ".bak");
+            if (jsonString != null && jsonString.length() > 0) {
+                this.decode(jsonString);
+                log.info("load " + fileName + " OK");
+                return true;
+            }
+        } catch (Exception e) {
+            log.error("load " + fileName + " Failed", e);
+            return false;
+        }
+        return false;
+    }
+
+    private boolean loadOldVersionConsumerOffset() {
+        String fileName = null;
+        try {
+            fileName = super.configFilePath();
+            String jsonString = MixAll.file2String(fileName);
+
+            if (null == jsonString || jsonString.length() == 0) {
+                return this.loadOldBak();
+            } else {
+                this.decodeOldVersion(jsonString);
+                log.info("load old version " + fileName + " OK");
+                return true;
+            }
+        } catch (Exception e) {
+            log.error("load old version" + fileName + " failed, and try to load old backup file", e);
+            return this.loadOldBak();
+        }
+    }
+
+    private boolean loadOldBak() {
+        String fileName = null;
+        try {
+            fileName = super.configFilePath();
+            String jsonString = MixAll.file2String(fileName + ".bak");
+            if (jsonString != null && jsonString.length() > 0) {
+                this.decodeOldVersion(jsonString);
+                log.info("load old bak" + fileName + " OK");
+                return true;
+            }
+        } catch (Exception e) {
+            log.error("load old bak" + fileName + " Failed", e);
+            return false;
+        }
+        return true;
+    }
+
+    private void decodeOldVersion(String jsonString) {
+        if (jsonString != null) {
+            ConsumerOffsetManager obj = RemotingSerializable.fromJson(jsonString, ConsumerOffsetManager.class);
+            if (obj != null) {
+                super.setOffsetTable(obj.getOffsetTable());
+            }
+        }
+    }
+
     @Override
     public long queryOffset(final String group, final String topic, final int queueId) {
         if (!MixAll.isLmq(group)) {
diff --git a/common/src/main/java/org/apache/rocketmq/common/ConfigManager.java b/common/src/main/java/org/apache/rocketmq/common/ConfigManager.java
index f712e1694d8..de893fddd86 100644
--- a/common/src/main/java/org/apache/rocketmq/common/ConfigManager.java
+++ b/common/src/main/java/org/apache/rocketmq/common/ConfigManager.java
@@ -48,7 +48,7 @@ public boolean load() {
 
     public abstract String configFilePath();
 
-    private boolean loadBak() {
+    protected boolean loadBak() {
         String fileName = null;
         try {
             fileName = this.configFilePath();