使用Canal實現redis和mysql的同步

### canal 工作思路

Canal 會將自己偽裝成 MySQL 從節點（Slave），并從主節點（Master）獲取 Binlog，解析和貯存后供下游消費端使用。Canal 包含兩個組成部分：服務端和客戶端。服務端負責連接至不同的 MySQL 實例，并為每個實例維護一個事件消息隊列；客戶端則可以訂閱這些隊列中的數據變更事件，處理并存儲到數據倉庫中。下面我們將mysql同步到 redis

mysql版本 5.6

canal版本 1.1.0

安裝 mysql 后修改自己mysql配置

vim /etc/my.cnf

# 開啟mysql的binlog模塊 log-bin=mysql-bin binlog-format=ROW # server_id需保證唯一，不能和canal的slaveId重復 server_id=121 # 需要同步的數據庫名稱 binlog-do-db=test_canal # 忽略的數據庫，建議填寫 binlog-ignore-db=mysql # 啟動mysql時不啟動grant-tables授權表 skip-grant-tables

創建一個mysql用戶canal 并且賦遠程鏈接權限權限，和測試庫test_canal,

CREATE USER canal IDENTIFIED BY 'canal'; GRANT ALL PRIVILEGES ON test_canal.user TO 'canal'@'%'; FLUSH PRIVILEGES;

使用root賬戶進去看看
select * from mysql.user where user=’canal’ \G其查詢結果列表中Repl_slave_priv,Repl_client_priv中的為Y是對的,查看主從備份如下圖：

• Canal部分

下載canal：https://github.com/alibaba/canal/releases/

下載版本為1.1.0，解壓即可

tar -zxvf canal.deployer-1.1.0.tar.gz -C /usr/local/cancal/

解壓后得到四個目錄bin、conf、lib、logs
基本上配置都在一下兩個配置文件中

canal.properties無需修改 ，instance.properties需要配置所同步的組件

instance.properties配置如下

################################################# ## mysql serverId , v1.0.26+ will autoGen #與mysql配置文件一致 canal.instance.mysql.slaveId=121# enable gtid use true/false canal.instance.gtidon=false# position info canal.instance.master.address=ip:3306 canal.instance.master.journal.name= canal.instance.master.position= canal.instance.master.timestamp= canal.instance.master.gtid=# rds oss binlog canal.instance.rds.accesskey= canal.instance.rds.secretkey= canal.instance.rds.instanceId=# table meta tsdb info #暫時用不上設為false canal.instance.tsdb.enable=false canal.instance.tsdb.dir=${canal.file.data.dir:../conf}/${canal.instance.destination:} canal.instance.tsdb.url=jdbc:h2:${canal.instance.tsdb.dir}/h2;CACHE_SIZE=1000;MODE=MYSQL; #canal.instance.tsdb.url=jdbc:mysql://127.0.0.1:3306/canal_tsdb canal.instance.tsdb.dbUsername=canal canal.instance.tsdb.dbPassword=canal#canal.instance.standby.address = #canal.instance.standby.journal.name = #canal.instance.standby.position = #canal.instance.standby.timestamp = #canal.instance.standby.gtid=# username/password canal.instance.dbUsername=canal canal.instance.dbPassword=canal canal.instance.defaultDatabaseName=test_canal canal.instance.connectionCharset=UTF-8# table regex canal.instance.filter.regex=.*\\..* # table black regex canal.instance.filter.black.regex= #################################################

查看日志是否啟動成功:logs/canal/canal.log 和logs/example/example.log

logs/canal/canal.log文件中有如下內容：the canal server is running now ......
logs/example/example.log文件中有如下內容：start successful....

Java的canal客戶端和jedis

在項目maven中添加redis和canal依賴

<dependency><groupId>com.alibaba.otter</groupId><artifactId>canal.client</artifactId><version>1.0.25</version></dependency><dependency><groupId>redis.clients</groupId><artifactId>jedis</artifactId><version>2.9.0</version></dependency>

redis工具類：

import redis.clients.jedis.Jedis; import redis.clients.jedis.JedisPool; import redis.clients.jedis.JedisPoolConfig;/*** @author lgz*/ public class RedisUtil {private static Jedis jedis = null;public static synchronized Jedis getJedis() {if (jedis == null) {jedis = new Jedis("192.168.188.128", 6379);jedis.auth("redis1234");}return jedis;}public static boolean existKey(String key) {return getJedis().exists(key);}public static void delKey(String key) {getJedis().del(key);}public static String stringGet(String key) {return getJedis().get(key);}public static String stringSet(String key, String value) {return getJedis().set(key, value);}public static void hashSet(String key, String field, String value) {getJedis().hset(key, field, value);} }

canal客戶端：

package com.wlx.demo.config; import com.alibaba.fastjson.JSONObject; import com.alibaba.otter.canal.client.CanalConnector; import com.alibaba.otter.canal.client.CanalConnectors; import com.alibaba.otter.canal.protocol.CanalEntry.*; import com.alibaba.otter.canal.protocol.Message;import java.net.InetSocketAddress; import java.util.List; /*** Created by zhangpan on 2019/1/4.*/ public class CanalApplication {public static void main(String args[]) {CanalConnector connector = CanalConnectors.newSingleConnector(new InetSocketAddress("ip",11111), "example", "", "");int batchSize = 100;try {connector.connect();connector.subscribe(".*\\..*");connector.rollback();while (true) {// 獲取指定數量的數據Message message = connector.getWithoutAck(batchSize);long batchId = message.getId();int size = message.getEntries().size();System.out.println("batchId = " + batchId);System.out.println("size = " + size);if (batchId == -1 || size == 0) {try {Thread.sleep(1000);} catch (InterruptedException e) {e.printStackTrace();}} else {printEntry(message.getEntries());}// 提交確認connector.ack(batchId);// connector.rollback(batchId); // 處理失敗, 回滾數據}} finally {connector.disconnect();}}private static void printEntry(List<Entry> entrys) {for (Entry entry : entrys) {if (entry.getEntryType() == EntryType.TRANSACTIONBEGIN || entry.getEntryType() == EntryType.TRANSACTIONEND) {continue;}RowChange rowChage = null;try {rowChage = RowChange.parseFrom(entry.getStoreValue());} catch (Exception e) {throw new RuntimeException("ERROR ## parser of eromanga-event has an error , data:" + entry.toString(),e);}EventType eventType = rowChage.getEventType();System.out.println(String.format("================> binlog[%s:%s] , name[%s,%s] , eventType : %s",entry.getHeader().getLogfileName(), entry.getHeader().getLogfileOffset(),entry.getHeader().getSchemaName(), entry.getHeader().getTableName(),eventType));for (RowData rowData : rowChage.getRowDatasList()) {if (eventType == EventType.DELETE) {redisDelete(rowData.getBeforeColumnsList());} else if (eventType == EventType.INSERT) {redisInsert(rowData.getAfterColumnsList());} else {System.out.println("-------> before");printColumn(rowData.getBeforeColumnsList());System.out.println("-------> after");redisUpdate(rowData.getAfterColumnsList());}}}}private static void printColumn(List<Column> columns) {for (Column column : columns) {System.out.println(column.getName() + " : " + column.getValue() + " update=" + column.getUpdated());}}private static void redisInsert(List<Column> columns) {JSONObject json = new JSONObject();for (Column column : columns) {json.put(column.getName(), column.getValue());}if (columns.size() > 0) {RedisUtil.stringSet("user:" + columns.get(0).getValue(), json.toJSONString());}}private static void redisUpdate(List<Column> columns) {JSONObject json = new JSONObject();for (Column column : columns) {json.put(column.getName(), column.getValue());}if (columns.size() > 0) {RedisUtil.stringSet("user:" + columns.get(0).getValue(), json.toJSONString());}}private static void redisDelete(List<Column> columns) {JSONObject json = new JSONObject();for (Column column : columns) {json.put(column.getName(), column.getValue());}if (columns.size() > 0) {RedisUtil.delKey("user:" + columns.get(0).getValue());}} }

在test_canal新建user表，

CREATE TABLE `user` (`id` int(11) NOT NULL,`name` varchar(255) DEFAULT NULL,PRIMARY KEY (`id`) ) ENGINE=InnoDB DEFAULT CHARSET=latin1;

添加數據可以在控制臺看到消息：
INSERT INTOuser(id,name) VALUES (1,'zhangpan');

控制臺消息

size = 3 ================> binlog[mysql-bin.000005:5001] , name[test_canal,user] , eventType : INSERT

參考博客：https://blog.csdn.net/lyl0724/article/details/80528428
轉載請說明出處！謝謝，本文地址：https://www.cnblogs.com/ontoweb-zp/p/10232017.html

轉載于:https://www.cnblogs.com/ontoweb-zp/p/10232017.html

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