【Maxwell】03 定向监听&全量输出

一、定向监听

定向监听，即只监听某一个特定的表，或者库

1、创建样本案例

-- 创建监听的库（演示样本）
CREATE DATABASE `test-db-2` CHARACTER SET 'utf8mb4' COLLATE 'utf8mb4_general_ci';

-- 和需要监听的表 （演示样本）
CREATE TABLE `test-db-2`.`sample` (
`ID` bigint(20) NOT NULL AUTO_INCREMENT,
`NAME` varchar(64) DEFAULT NULL,
`TYPE` int(12) DEFAULT NULL,
PRIMARY KEY (`ID`)
) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8mb4;

2、定向监听的参数项：

cd /usr/local/maxwell-1.29.2
./bin/maxwell \
--user='maxwell' \
--password='123456' \
--host='192.168.2.225' \
--port='3308' \
--producer='stdout' \
--filter="exclude:*.*, include:test-db-2.sample" \
--jdbc_options='useSSL=false&serverTimezone=Asia/Shanghai'

# 定向监听，通过过滤器参数实现
--filter="exclude:*.*, include:test-db-2.sample"

# exclude，表示排除
# include，表示包含

针对该库的sample表进行操作，是能够监听的

[root@localhost maxwell-1.29.2]# ./bin/maxwell \
> --user='maxwell' \
> --password='123456' \
> --host='192.168.2.225' \
> --port='3308' \
> --producer='stdout' \
> --filter="exclude:*.*, include:test-db-2.sample" \
> --jdbc_options='useSSL=false&serverTimezone=Asia/Shanghai'
Using kafka version: 1.0.0
17:01:57,280 INFO  Maxwell - Starting Maxwell. maxMemory: 247332864 bufferMemoryUsage: 0.25
17:01:57,493 INFO  Maxwell - Maxwell v1.29.2 is booting (StdoutProducer), starting at Position[BinlogPosition[mysql-bin.000005:656973], lastHeartbeat=1642495761716]
17:01:57,651 INFO  MysqlSavedSchema - Restoring schema id 1 (last modified at Position[BinlogPosition[mysql-bin.000005:16191], lastHeartbeat=0])
17:01:57,819 INFO  BinlogConnectorReplicator - Setting initial binlog pos to: mysql-bin.000005:656973
17:01:57,856 INFO  BinaryLogClient - Connected to 192.168.2.225:3308 at mysql-bin.000005/656973 (sid:6379, cid:254)
17:01:57,856 INFO  BinlogConnectorReplicator - Binlog connected.
17:01:58,149 INFO  AbstractSchemaStore - storing schema @Position[BinlogPosition[mysql-bin.000005:657429], lastHeartbeat=1642495761716] after applying "CREATE DATABASE `test-db-2` CHARACTER SET 'utf8mb4' COLLATE 'utf8mb4_general_ci'" to test-db-2, new schema id is 2
17:01:58,223 INFO  AbstractSchemaStore - storing schema @Position[BinlogPosition[mysql-bin.000005:657658], lastHeartbeat=1642495761716] after applying "CREATE TABLE `sample` (   `ID` bigint(20) NOT NULL AUTO_INCREMENT,   `NAME` varchar(64) DEFAULT NULL,   `TYPE` int(12) DEFAULT NULL,   PRIMARY KEY (`ID`) ) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8mb4" to test-db-2, new schema id is 3
{"database":"test-db-2","table":"sample","type":"insert","ts":1642496453,"xid":87865,"commit":true,"data":{"ID":1,"NAME":"1","TYPE":11}}

如果在其他库操作，Maxwell则是不会监听的

INSERT INTO `test-db`.`day_sale` (`ID`, `PRODUCT`, `CHANNEL`, `AMOUNT`, `SALE_DATE`) VALUES
(NULL, '产品A', '拼多多', 2497.0000, NOW()),
(NULL, '产品B', '京东', 2497.0000, NOW()),
(NULL, '产品C', '淘宝', 2497.0000, NOW())

二、全量输出

全量输出，通过主库存放的maxwell库的元数据的更改，实现数据初始化

（除了这种方法还有其他3种，未列举出来）

需求：

将 test-db-2 库下的 sample 表的四条数据，全量导入到 maxwell 控制台进行打印。

操作：

INSERT INTO `maxwell`.`bootstrap` (`id`, `database_name`, `table_name`, `where_clause`, `is_complete`, `inserted_rows`, `total_rows`, `created_at`, `started_at`, `completed_at`, `binlog_file`, `binlog_position`, `client_id`, `comment`) VALUES
(NULL, 'test-db-2', 'sample', NULL, 0, 0, 0, NULL, NULL, NULL, NULL, 0, 'maxwell', NULL);

输出日志

# 不关闭maxwell也能执行，maxwell先监听了maxwell库的bootstrap表的操作，发现了初始化操作，然后执行同步
{"database":"maxwell","table":"bootstrap","type":"insert","ts":1642497749,"xid":90142,"commit":true,"data":{"id":2,"database_name":"test-db-2","table_name":"sample","where_clause":null,"is_complete":0,"inserted_rows":0,"total_rows":0,"created_at":null,"started_at":null,"completed_at":null,"binlog_file":null,"binlog_position":0,"client_id":"maxwell","comment":null}}
{"database":"test-db-2","table":"sample","type":"bootstrap-start","ts":1642497347,"data":{}}
17:15:47,541 INFO  SynchronousBootstrapper - bootstrapping started for test-db-2.sample
{"database":"test-db-2","table":"sample","type":"bootstrap-insert","ts":1642497347,"data":{"ID":1,"NAME":"1","TYPE":11}}
{"database":"test-db-2","table":"sample","type":"bootstrap-insert","ts":1642497347,"data":{"ID":2,"NAME":"2","TYPE":22}}
{"database":"test-db-2","table":"sample","type":"bootstrap-insert","ts":1642497347,"data":{"ID":3,"NAME":"3","TYPE":33}}
{"database":"test-db-2","table":"sample","type":"bootstrap-insert","ts":1642497347,"data":{"ID":4,"NAME":"4","TYPE":44}}
{"database":"test-db-2","table":"sample","type":"bootstrap-insert","ts":1642497347,"data":{"ID":5,"NAME":"5","TYPE":55}}
{"database":"test-db-2","table":"sample","type":"bootstrap-complete","ts":1642497347,"data":{}}
17:15:47,592 INFO  SynchronousBootstrapper - bootstrapping ended for #2 test-db-2.sample

同步完成的结果：

SELECT * FROM `maxwell`.`bootstrap`;
+----+---------------+------------+--------------+-------------+---------------+------------+------------+---------------------+---------------------+-------------+-----------------+-----------+---------+
| id | database_name | table_name | where_clause | is_complete | inserted_rows | total_rows | created_at | started_at          | completed_at        | binlog_file | binlog_position | client_id | comment |
+----+---------------+------------+--------------+-------------+---------------+------------+------------+---------------------+---------------------+-------------+-----------------+-----------+---------+
|  2 | test-db-2     | sample     | NULL         |           1 |             5 |          0 | NULL       | 2022-01-18 17:22:30 | 2022-01-18 17:22:30 | NULL        |               0 | maxwell   | NULL    |
+----+---------------+------------+--------------+-------------+---------------+------------+------------+---------------------+---------------------+-------------+-----------------+-----------+---------+

当数据全部初始化完成以后，Maxwell 的元数据会变化
is_complete 字段从 0 变为 1
started_at 字段从 null 变为具体时间(数据同步开始时间)
completed_at 字段从 null 变为具体时间(数据同步结束时间)