Maxwell版本1.39.2

一： 添加zk的pox文件

<!-- customize HA -->
<dependency>
  <groupId>org.apache.curator</groupId>
  <artifactId>curator-framework</artifactId>
  <version>5.4.0</version>
</dependency>

<dependency>
  <groupId>org.apache.curator</groupId>
  <artifactId>curator-recipes</artifactId>
  <version>5.4.0</version>
</dependency>

二： 创建zk工具类

在 com.zendesk.maxwell.util 包下创建 CuratorUtil 类，后面会使用此类实现高可用

package com.zendesk.maxwell.util;

import org.apache.curator.framework.CuratorFramework;
import org.apache.curator.framework.CuratorFrameworkFactory;
import org.apache.curator.framework.recipes.locks.InterProcessMutex;
import org.apache.curator.retry.ExponentialBackoffRetry;
import org.apache.zookeeper.CreateMode;

public class CuratorUtil {

 private final String zookeeperServers;
 private final int sessionTimeoutMs;
 private final int connectionTimeoutMs;
 private final int baseSleepTimeMs;
 private final int maxRetries;
 private CuratorFramework client;

 public CuratorUtil(String zookeeperServers, int sessionTimeoutMs, int connectionTimeoutMs, int baseSleepTimeMs,
   int maxRetries) {
  this.zookeeperServers = zookeeperServers;
  this.sessionTimeoutMs = sessionTimeoutMs;
  this.connectionTimeoutMs = connectionTimeoutMs;
  this.baseSleepTimeMs = baseSleepTimeMs;
  this.maxRetries = maxRetries;
 }

 /*
  * 构造 zookeeper 客户端，并连接 zookeeper 集群
  */
 public void start() {
  ExponentialBackoffRetry retryPolicy = new ExponentialBackoffRetry(this.baseSleepTimeMs, this.maxRetries);
  client = CuratorFrameworkFactory.newClient(
    this.zookeeperServers,
    this.sessionTimeoutMs,
    this.connectionTimeoutMs,
    retryPolicy
  );
  client.start();
 }

 /*
  * 实现分布式锁
  */
 public void highAvailable() {
  // 1.连接 Zookeeper 客户端
  this.start();
  // 2.向 zookeeper 注册自己
  String lockPath = "/maxwell/ha/lock";
  InterProcessMutex lock = new InterProcessMutex(client, lockPath);
  try {
   // 3.获取锁
   lock.acquire();
   // 4.将自己信息注册到 leader 路径
   String leaderPath = "/maxwell/ha/leader";
   client.create()
     .withMode(CreateMode.EPHEMERAL)
     .forPath(leaderPath);
  } catch (Exception e) {
   e.printStackTrace();
  }
 }
}

三： 修改 com.zendesk.maxwell 包下的MaxwellConfig类

3.1 添加属性

// 类新增属性
public String zookeeperServers;
public int sessionTimeoutMs;
public int connectionTimeoutMs;
public int baseSleepTimeMs;
public int maxRetries;

3.2 buildOptionParser 方法添加代码

parser.accepts( "zookeeper", "zookeeper servers support maxwell high available" )
  .withRequiredArg();
parser.accepts( "session_timeout_ms", "session timeout ms with zookeeper" )
  .withRequiredArg();
parser.accepts( "connection_timeout_ms", "connection timeout ms with zookeeper" )
  .withRequiredArg();
parser.accepts( "base_sleep_time_ms", "base sleep time ms if retry" )
  .withRequiredArg();
parser.accepts( "max_retries", "max retry times" )
  .withRequiredArg();

3.3 setup 方法添加代码

this.haMode = fetchBooleanOption("ha", options, properties, false);
this.zookeeperServers = fetchStringOption("zookeeper",options, properties, null);
this.sessionTimeoutMs = fetchIntegerOption("session_timeout_ms",options, properties, 5000);
this.connectionTimeoutMs = fetchIntegerOption("connection_timeout_ms",options, properties, 5000);
this.baseSleepTimeMs = fetchIntegerOption("base_sleep_time_ms",options, properties, 5000);
this.maxRetries = fetchIntegerOption("max_retries",options, properties, 3);
if (haMode && zookeeperServers == null){
 LOGGER.error("you must specify --zookeeper because you want to use maxwell in ha mode");
}

四：修改 com.zendesk.maxwell.Maxwell 的main函数

将代码段

if ( config.haMode ) {
 new MaxwellHA(maxwell, config.jgroupsConf, config.raftMemberID, config.clientID).startHA();
} else {
 maxwell.start();
}

全部注释掉，修改为

if ( config.haMode ) {
 CuratorUtil curatorUtil = new CuratorUtil(config.zookeeperServers, config.sessionTimeoutMs, config.connectionTimeoutMs, config.baseSleepTimeMs, config.maxRetries);
 curatorUtil.highAvailable();
}
maxwell.start();

然后重新打包就能得到基于zk的高可用版本了，打包时可以将test包删除，防止出现错误

源码下载地址

五： 启动脚本

5.1 创建配置文件 config.properties

log_level=info

mysql login info

host=localhost
port=3306
user=root
password=root123
schema_database=maxwell

options to pass into the jdbc connection, given as opt=val&opt2=val2

#jdbc_options=opt1=100&opt2=hello

producer=kafka

*** kafka ***

producer=kafka
#kafka.bootstrap.servers=hosta:9092,hostb:9092
kafka.bootstrap.servers=localhost:9092
kafka.max.request.size = 104857600

kafka_topic=mysql.%{database}.%{table}
kafka_version=2.7.0

alternative kafka topic to write DDL (alter/create/drop) to. Defaults to kafka_topic

#ddl_kafka_topic=maxwell_ddl

hash function to use. "default" is just the JVM's 'hashCode' function.

#kafka_partition_hash=default # [default, murmur3]

how maxwell writes its kafka key.

'hash' looks like:

{"database":"test","table":"tickets","pk.id":10001}

'array' looks like:

["test","tickets",[{"id":10001}]]

default: "hash"

#kafka_key_format=hash # [hash, array]

5.2 启动脚本编写 startup.sh

#!/bin/bash

single(){
bin/maxwell --filter 'exclude: ., include: cp.*' --kafka_version=2.7.0 --config=config.properties --daemon
echo -e "\033[32m单机版启动成功\n\033[0m"
}

ha(){

zookeeper 多个用,分割

bin/maxwell --filter 'exclude: ., include: cp.*' --kafka_version=2.7.0 --config=config.properties --ha --zookeeper=127.0.0.1:2181 --daemon
echo -e "\033[32m高可用版启动成功\n\033[0m"
}

case "$1" in
'ha')
ha
;;
*)
single
;;
esac

5.2.1 高可用版本启动命令

./startup.sh ha

5.2.2 单机版启动命令

./startup.sh