任务需求：将MySQL里的数据实时增量同步到Kafka
1、准备工作
1.1、MySQL方面：开启BinLog
1.1.1、修改my.cnf文件
vi /etc/my.cnf
[mysqld]
server-id = 1
binlog_format = ROW
1.1.2、重启MySQL,然后登陆到MySQL之后，查看是否已经修改过来:
mysql> show variables like 'binlog_format';
+---------------+-------+
| Variable_name | Value |
+---------------+-------+
| binlog_format | ROW |
+---------------+-------+
1.1.3、创建Maxwell用户，并赋予 maxwell 库的一些权限
CREATE USER 'maxwell'@'%' IDENTIFIED BY '123456';
GRANT ALL ON maxwell.* TO 'maxwell'@'%';
GRANT SELECT, REPLICATION CLIENT, REPLICATION SLAVE on *.* to 'maxwell'@'%';
1.2、Kafka准备工作
1.2.1、启动Zookeeper
zookeeper-server-start /usr/local/etc/kafka/zookeeper.properties
1.2.2、启动kafka
kafka-server-start /usr/local/etc/kafka/server.properties
2、Maxwell
2.1、下载安装包
https://github.com/zendesk/maxwell/releases/download/v1.20.0/maxwell-1.20.0.tar.gz
2.2、解压到指定位置
tar -zxvf maxwell-1.20.0.tar.gz
2.3、在MYSQL中创建测试用表（前提你要进入一个库）
CREATE TABLE `test` (`id` bigint(20) NOT NULL AUTO_INCREMENT,`age` int(11) DEFAULT NULL,`name` varchar(255) DEFAULT NULL,PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
2.4、打开Maxwell（要在maxwell安装目录下）
bin/maxwell --user=maxwell --password=123456 --host='127.0.0.1' --producer=stdout
2.5、对数据进行操作
insert into test values(1,22,"小明");
update test set name='whirly' where id=1;
delete from test where id=1;
可以看到Maxwell控制台的输出，测试成功！
{"database":"test","table":"test","type":"insert","ts":1552153502,"xid":832,"commit":true,"data":{"id":1,"age":22,"name":"小明锋"}}
{"database":"test","table":"test","type":"update","ts":1552153502,"xid":833,"commit":true,"data":{"id":1,"age":22,"name":"whirly"},"old":{"name":"小明"}}
{"database":"test","table":"test","type":"delete","ts":1552153502,"xid":834,"commit":true,"data":{"id":1,"age":22,"name":"whirly"}}
3、实现MySQL数据实时增量同步到Kafka
3.1、开启指定到Kafka的MaxWell
bin/maxwell --user='maxwell' --password='123456' --host='127.0.0.1' \--producer=kafka --kafka.bootstrap.servers=localhost:9092 --kafka_topic=maxwell --kafka_version=0.10.2.1
3.2、对数据库进行操作
insert into test values(1,22,"小明");
update test set name='whirly' where id=1;
delete from test where id=1;
3.3、启动一个消费者来消费 maxwell topic的消息，观察其输出；
kafka-console-consumer --bootstrap-server 127.0.0.1:9092 --topic test --from-beginning
3.4、再次执行数据库结果观察，仍然可以得到相同的输出
