1、前言
因最近有TiDB回迁MySQL的业务需求，需要测试TiDB 到MySQL的迁移过程，本次利用dumpling导出+TiCDC进行初始数据+实时同步迁移。
2、信息
TiDB集群版本：5.2.2
来源TiDB集群：666-1
目标MySQL集群：888-1
导出工具：dumpling
导入工具：执行SQL文件
实时同步：TiCDC
MySQL主实例IP：10.5.5.5
TiDB中控机：10.4.4.4
3、部署TiCDC
集群666-1
【生成TiCDC扩容配置】：
vim add.yml
cdc_servers:
- host: 10.1.1.1
port: 777
deploy_dir: /opt/tidb666/deploy/cdc-777
data_dir: /opt/tidb666/data/cdc-777
log_dir: /opt/tidb666/log/cdc-777
- host: 10.1.1.2
port: 777
deploy_dir: /opt/tidb666/deploy/cdc-777
data_dir: /opt/tidb666/data/cdc-777
log_dir: /opt/tidb666/log/cdc-777
- host: 10.1.1.3
port: 777
deploy_dir: /opt/tidb666/deploy/cdc-777
data_dir: /opt/tidb666/data/cdc-777
log_dir: /opt/tidb666/log/cdc-777
【执行部署】：
tiup cluster scale-out 666_TEST add.yml
【查看拓扑】：
qtidb -c 666-1
4、导出数据
cd tidb-toolkit-v5.2.2-linux-amd64/bin
./dumpling -udba -pxxx -h10.x.x.x -P666 --status-addr 999 -F 64MiB -t 2 -o 666_dump -B dba_test >> 666_dump_log
【查看备份的文件】：
[tidb() bin]$ ll 666_dump/
total 24
-rw-rw-r-- 1 tidb tidb 146 Jul 24 11:34 metadata
-rw-rw-r-- 1 tidb tidb 109 Jul 24 11:34 dba_test-schema-create.sql
-rw-rw-r-- 1 tidb tidb 112 Jul 24 11:34 dba_test.test.000000000.sql
-rw-rw-r-- 1 tidb tidb 66 Jul 24 11:34 dba_test.test2.000000000.sql
-rw-rw-r-- 1 tidb tidb 266 Jul 24 11:34 dba_test.test2-schema.sql
-rw-rw-r-- 1 tidb tidb 265 Jul 24 11:34 dba_test.test-schema.sql
【查看备份的点位】：
cat metadata
Started dump at: 2022-07-24 11:34:31
SHOW MASTER STATUS:
Log: tidb-binlog
Pos: 434800865229668357
GTID:
Finished dump at: 2022-07-24 11:34:31
【TiDB666 模拟新写入数据】：
(dba:666)@[(none)]>use dba_test
Database changed
(dba:666)@[dba_test]>show tables;
+------------------------------+
| Tables_in_dba_test |
+------------------------------+
| test |
| test2 |
+------------------------------+
2 rows in set (0.00 sec)
(dba:666)@[dba_test]>select * from test;
+----+------+
| id | name |
+----+------+
| 1 | aa |
| 33 | ccc |
| 44 | ddd |
| 55 | eee |
| 66 | ff |
+----+------+
5 rows in set (0.00 sec)
(dba:666)@[dba_test]>insert into test values (77,'gg');
Query OK, 1 row affected (0.01 sec)
(dba:666)@[dba_test]>insert into test values (88,'re');
Query OK, 1 row affected (0.00 sec)
(dba:666)@[dba_test]>select * from test;
+----+------+
| id | name |
+----+------+
| 1 | aa |
| 33 | ccc |
| 44 | ddd |
| 55 | eee |
| 66 | ff |
| 77 | gg |
| 88 | re |
+----+------+
7 rows in set (0.00 sec)
5、MySQL导入数据
5.1、拷贝导出的备份到MySQL主实例的机器
scp -r 666_dump 10.5.5.5:/data/
5.2、执行导入
ssh 主实例机器
登录mysql
(root@(none))>show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| sys |
| performance_schema |
+--------------------+
9 rows in set (0.00 sec)
(root@(none))>source /data/666_dump/dba_test-schema-create.sql
Query OK, 0 rows affected (0.00 sec)
Query OK, 1 row affected (0.00 sec)
(root@(none))>show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
| sys |
| dba_test |
+--------------------+
10 rows in set (0.00 sec)
(root@(none))>use dba_test
Database changed
(root@dba_test)>source /data/666_dump/dba_test.test2-schema.sql
Query OK, 0 rows affected (0.00 sec)
Query OK, 0 rows affected (0.00 sec)
(root@dba_test)>source /data/666_dump/dba_test.test-schema.sql
Query OK, 0 rows affected (0.00 sec)
Query OK, 0 rows affected (0.00 sec)
(root@dba_test)>show tables;
+------------------------------+
| Tables_in_dba_test |
+------------------------------+
| test |
| test2 |
+------------------------------+
2 rows in set (0.00 sec)
(root@dba_test)>select * from test;
Empty set (0.00 sec)
(root@dba_test)>select * from test2;
Empty set (0.00 sec)
(root@dba_test)>source /data/666_dump/dba_test.test.000000000.sql
Query OK, 0 rows affected (0.00 sec)
Query OK, 5 rows affected (0.00 sec)
Records: 5 Duplicates: 0 Warnings: 0
(root@dba_test)>source /data/666_dump/dba_test.test2.000000000.sql
Query OK, 0 rows affected (0.00 sec)
Query OK, 1 row affected (0.00 sec)
(root@dba_test)>select * from test;
+----+------+
| id | name |
+----+------+
| 1 | aa |
| 33 | ccc |
| 44 | ddd |
| 55 | eee |
| 66 | ff |
+----+------+
5 rows in set (0.00 sec)
(root@dba_test)>select * from test2;
+----+------+
| id | name |
+----+------+
| 2 | bb |
+----+------+
1 row in set (0.00 sec)
6、实时同步
6.1、查看TiCDC
ssh 10.4.4.4
[root()@name-2-2 ~]# su - tidb
Last login: Sun Jul 24 11:28:38 CST 2022 on pts/0
[tidb()@name-2-2 ~]$ tiup ctl:v5.2.2 cdc capture list --pd=http://10.3.3.3:678
Starting component `ctl`: /home/tidb/.tiup/components/ctl/v5.2.2/ctl cdc capture list --pd=http://10.3.3.3:678
[
{
"id": "42492be0-dd2b-49da-9562-86ba5feff288",
"is-owner": false,
"address": "10.1.1.1:567"
},
{
"id": "5543f93e-e0c8-4e91-a468-88362454b958",
"is-owner": false,
"address": "10.1.1.2:567"
},
{
"id": "6688a5c7-0779-487e-86f6-46b068743652",
"is-owner": true,
"address": "10.1.1.3:567"
}
]
6.2、创建同步任务:
【配置文件】：
[tidb()@name-2-2 666_ticdc]$ cd /data/tidb/666_ticdc
[tidb()@name-2-2 666_ticdc]$ cat 666_888_ticdc_config.toml
case-sensitive = true
enable-old-value = true
[filter]
rules = ['dba_test.*']
[mounter]
worker-num = 8
【创建同步任务】：
[tidb()@name-2-2 666_ticdc]$ tiup ctl:v5.2.2 cdc changefeed create --pd=http://10.3.3.3:678 --sink-uri="mysql://dba:xxx@10.5.5.5:888/?worker-count=16&max-txn-row=5000&time-zone=SYSTEM" --changefeed-id="666-888-20220724-task" --sort-engine="unified" --start-ts=434800865229668357 --config 666_888_ticdc_config.toml
Starting component `ctl`: /home/tidb/.tiup/components/ctl/v5.2.2/ctl cdc changefeed create --pd=http://10.3.3.3:678 --sink-uri=mysql://dba:xxx@10.5.5.5:888/?worker-count=16&max-txn-row=5000&time-zone=SYSTEM --changefeed-id=666-888-20220724-task --sort-engine=unified --start-ts=434800865229668357 --config 666_888_ticdc_config.toml
Create changefeed successfully!
ID: 666-888-20220724-task
Info: {"sink-uri":"mysql://dba:xxx@10.5.5.5:888/?worker-count=16\u0026max-txn-row=5000\u0026time-zone=SYSTEM","opts":{"_changefeed_id":"cli-verify"},"create-time":"2022-07-24T12:20:45.606052447+08:00","start-ts":434800865229668357,"target-ts":0,"admin-job-type":0,"sort-engine":"unified","sort-dir":"","config":{"case-sensitive":true,"enable-old-value":true,"force-replicate":false,"check-gc-safe-point":true,"filter":{"rules":["dba_test.*"],"ignore-txn-start-ts":null},"mounter":{"worker-num":8},"sink":{"dispatchers":null,"protocol":"default"},"cyclic-replication":{"enable":false,"replica-id":0,"filter-replica-ids":null,"id-buckets":0,"sync-ddl":false},"scheduler":{"type":"table-number","polling-time":-1}},"state":"normal","history":null,"error":null,"sync-point-enabled":false,"sync-point-interval":600000000000,"creator-version":"v5.2.2"}
【查看所有任务】：
tiup ctl:v5.2.2 cdc changefeed list --pd=http://10.3.3.3:678
[tidb()@name-2-2 666_ticdc]$ tiup ctl:v5.2.2 cdc changefeed list --pd=http://10.3.3.3:678
Starting component `ctl`: /home/tidb/.tiup/components/ctl/v5.2.2/ctl cdc changefeed list --pd=http://10.3.3.3:678
[
{
"id": "666-888-20220724-task",
"summary": {
"state": "normal",
"tso": 434801605865111553,
"checkpoint": "2022-07-24 12:21:36.983",
"error": null
}
}
]
【查看指定的任务】：
[tidb()@name-2-2 666_ticdc]$ tiup ctl:v5.2.2 cdc changefeed query -s --pd=http://10.3.3.3:678 --changefeed-id=666-888-20220724-task
Starting component `ctl`: /home/tidb/.tiup/components/ctl/v5.2.2/ctl cdc changefeed query -s --pd=http://10.3.3.3:678 --changefeed-id=666-888-20220724-task
{
"state": "normal",
"tso": 434801616101834753,
"checkpoint": "2022-07-24 12:22:16.033",
"error": null
}
【查看任务详细信息】：
[tidb()@name-2-2 666_ticdc]$ tiup ctl:v5.2.2 cdc changefeed query --pd=http://10.3.3.3:678 --changefeed-id=666-888-20220724-task
Starting component `ctl`: /home/tidb/.tiup/components/ctl/v5.2.2/ctl cdc changefeed query --pd=http://10.3.3.3:678 --changefeed-id=666-888-20220724-task
{
"info": {
"sink-uri": "mysql://dba:xxx@10.5.5.5:888/?worker-count=16\u0026max-txn-row=5000\u0026time-zone=SYSTEM",
"opts": {
"_changefeed_id": "cli-verify"
},
"create-time": "2022-07-24T12:20:45.606052447+08:00",
"start-ts": 434800865229668357,
"target-ts": 0,
"admin-job-type": 0,
"sort-engine": "unified",
"sort-dir": "",
"config": {
"case-sensitive": true,
"enable-old-value": true,
"force-replicate": false,
"check-gc-safe-point": true,
"filter": {
"rules": [
"dba_test.*"
],
"ignore-txn-start-ts": null
},
"mounter": {
"worker-num": 8
},
"sink": {
"dispatchers": null,
"protocol": "default"
},
"cyclic-replication": {
"enable": false,
"replica-id": 0,
"filter-replica-ids": null,
"id-buckets": 0,
"sync-ddl": false
},
"scheduler": {
"type": "table-number",
"polling-time": -1
}
},
"state": "normal",
"history": null,
"error": null,
"sync-point-enabled": false,
"sync-point-interval": 600000000000,
"creator-version": "v5.2.2"
},
"status": {
"resolved-ts": 434801631581437953,
"checkpoint-ts": 434801631581437953,
"admin-job-type": 0
},
"count": 0,
"task-status": [
{
"capture-id": "42492be0-dd2b-49da-9562-86ba5feff288",
"status": {
"tables": null,
"operation": null,
"admin-job-type": 0
}
},
{
"capture-id": "5543f93e-e0c8-4e91-a468-88362454b958",
"status": {
"tables": {
"878": {
"start-ts": 434800865229668357,
"mark-table-id": 0
}
},
"operation": {},
"admin-job-type": 0
}
},
{
"capture-id": "6688a5c7-0779-487e-86f6-46b068743652",
"status": {
"tables": {
"880": {
"start-ts": 434800865229668357,
"mark-table-id": 0
}
},
"operation": {},
"admin-job-type": 0
}
}
]
}
6.3、MySQL校验同步情况
【查看MySQL数据】：
(root@dba_test)>select * from test;
+----+------+
| id | name |
+----+------+
| 1 | aa |
| 33 | ccc |
| 44 | ddd |
| 55 | eee |
| 66 | ff |
| 77 | gg |
| 88 | re |
+----+------+
7 rows in set (0.00 sec)
【再次模拟写入】：
【TiDB666-1】：写入数据
(dba:666)@[dba_test]>insert into test values (99,'we');
Query OK, 1 row affected (0.00 sec)
(dba:666)@[dba_test]>select * from test;
+----+------+
| id | name |
+----+------+
| 1 | aa |
| 33 | ccc |
| 44 | ddd |
| 55 | eee |
| 66 | ff |
| 77 | gg |
| 88 | re |
| 99 | we |
+----+------+
8 rows in set (0.00 sec)
【MySQL888-1】：查看数据
(root@dba_test)>select * from test;
+----+------+
| id | name |
+----+------+
| 1 | aa |
| 33 | ccc |
| 44 | ddd |
| 55 | eee |
| 66 | ff |
| 77 | gg |
| 88 | re |
| 99 | we |
+----+------+
8 rows in set (0.00 sec)
综上：同步正常
【测试过滤是否生效】：
【TiDB666-1】：dba_test2 库写入数据
(dba:666)@[dba_test]>use dba_test2
Database changed
(dba:666)@[dba_test2]>show tables;
+-------------------------+
| Tables_in_dba_test2 |
+-------------------------+
| tb_test |
+-------------------------+
1 row in set (0.00 sec)
(dba:666)@[dba_test2]>select * from tb_test;
+----+------+------------+
| id | age | statDate |
+----+------+------------+
| 1 | 2 | 2021-12-22 |
| 2 | 2 | 2021-12-22 |
+----+------+------------+
2 rows in set (0.00 sec)
(dba:666)@[dba_test2]>insert into tb_test values (3,1,'2022-07-24');
Query OK, 1 row affected (0.00 sec)
(dba:666)@[dba_test2]>select * from tb_test;
+----+------+------------+
| id | age | statDate |
+----+------+------------+
| 1 | 2 | 2021-12-22 |
| 2 | 2 | 2021-12-22 |
| 3 | 1 | 2022-07-24 |
+----+------+------------+
3 rows in set (0.00 sec)
(dba:666)@[dba_test2]>use dba_test
Database changed
(dba:666)@[dba_test]>insert into test values (100,'ee');
Query OK, 1 row affected (0.00 sec)
【MySQL888-1】：查看同步
(root@dba_test)>select * from test;
+-----+------+
| id | name |
+-----+------+
| 1 | aa |
| 33 | ccc |
| 44 | ddd |
| 55 | eee |
| 66 | ff |
| 77 | gg |
| 88 | re |
| 99 | we |
| 100 | ee |
+-----+------+
9 rows in set (0.00 sec)
综上：说明库过滤ok
6.4、关闭任务
【停止任务】：
[tidb()@name-2-2 666_ticdc]$ tiup ctl:v5.2.2 cdc changefeed remove --pd=http://10.3.3.3:678 --changefeed-id 666-888-20220724-task
Starting component `ctl`: /home/tidb/.tiup/components/ctl/v5.2.2/ctl cdc changefeed remove --pd=http://10.3.3.3:678 --changefeed-id 666-888-20220724-task
【查看任务】：
[tidb()@name-2-2 666_ticdc]$ tiup ctl:v5.2.2 cdc changefeed query --pd=http://10.3.3.3:678 --changefeed-id=666-888-20220724-task
Starting component `ctl`: /home/tidb/.tiup/components/ctl/v5.2.2/ctl cdc changefeed query --pd=http://10.3.3.3:678 --changefeed-id=666-888-20220724-task
[2022/07/24 12:29:30.408 +08:00] [WARN] [cli_changefeed_query.go:100] ["This changefeed has been deleted, the residual meta data will be completely deleted within 24 hours."] [changgefeed=666-888-20220724-task]
[2022/07/24 12:29:30.409 +08:00] [ERROR] [cli_changefeed_query.go:109] ["This changefeed does not exist"] [changefeed=666-888-20220724-task]
Error: [CDC:ErrChangeFeedNotExists]changefeed not exists, key: /tidb/cdc/job/666-888-20220724-task
Usage:
cdc cli changefeed query [flags]
Flags:
-c, --changefeed-id string Replication task (changefeed) ID
-h, --help help for query
-s, --simple Output simplified replication status
Global Flags:
--ca string CA certificate path for TLS connection
--cert string Certificate path for TLS connection
-i, --interact Run cdc cli with readline
--key string Private key path for TLS connection
--log-level string log level (etc: debug|info|warn|error) (default "warn")
--pd string PD address, use ',' to separate multiple PDs (default "http://127.0.0.1:2379")
[CDC:ErrChangeFeedNotExists]changefeed not exists, key: /tidb/cdc/job/666-888-20220724-task
Error: exit status 1
Error: run `/home/tidb/.tiup/components/ctl/v5.2.2/ctl` (wd:/home/tidb/.tiup/data/TCTXh8X) failed: exit status 1
【查看任务详细】：
[tidb()@name-2-2 666_ticdc]$ tiup ctl:v5.2.2 cdc changefeed query -s --pd=http://10.3.3.3:678 --changefeed-id=666-888-20220724-task
Starting component `ctl`: /home/tidb/.tiup/components/ctl/v5.2.2/ctl cdc changefeed query -s --pd=http://10.3.3.3:678 --changefeed-id=666-888-20220724-task
{
"state": "",
"tso": 0,
"checkpoint": "",
"error": null
}