TiCDC迁移-TiDB到MySQL测试

作者： 18515065291 原文来源：https://tidb.net/blog/1bd64e9e

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.ymlcdc_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 11:34:31SHOW 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_testDatabase 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([email protected](none))>show databases;+--------------------+| Database           |+--------------------+| information_schema || mysql              || sys                || performance_schema |+--------------------+9 rows in set (0.00 sec)([email protected](none))>source /data/666_dump/dba_test-schema-create.sqlQuery OK, 0 rows affected (0.00 sec)Query OK, 1 row affected (0.00 sec)([email protected](none))>show databases;+--------------------+| Database           |+--------------------+| information_schema || mysql              || performance_schema || sys                || dba_test           |+--------------------+10 rows in set (0.00 sec)([email protected](none))>use dba_testDatabase changed([email protected]_test)>source /data/666_dump/dba_test.test2-schema.sqlQuery OK, 0 rows affected (0.00 sec)Query OK, 0 rows affected (0.00 sec)([email protected]_test)>source /data/666_dump/dba_test.test-schema.sqlQuery OK, 0 rows affected (0.00 sec)Query OK, 0 rows affected (0.00 sec)([email protected]_test)>show tables;+------------------------------+| Tables_in_dba_test |+------------------------------+| test                         || test2                        |+------------------------------+2 rows in set (0.00 sec)([email protected]_test)>select * from test;Empty set (0.00 sec)([email protected]_test)>select * from test2;Empty set (0.00 sec)([email protected]_test)>source /data/666_dump/dba_test.test.000000000.sqlQuery OK, 0 rows affected (0.00 sec)Query OK, 5 rows affected (0.00 sec)Records: 5  Duplicates: 0  Warnings: 0([email protected]_test)>source /data/666_dump/dba_test.test2.000000000.sqlQuery OK, 0 rows affected (0.00 sec)Query OK, 1 row affected (0.00 sec)([email protected]_test)>select * from test;+----+------+| id | name |+----+------+|  1 | aa   || 33 | ccc  || 44 | ddd  || 55 | eee  || 66 | ff   |+----+------+5 rows in set (0.00 sec)([email protected]_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 - tidbLast 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://10.3.3.3:678Starting 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.tomlcase-sensitive = trueenable-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:[email protected]: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.tomlStarting 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:[email protected]: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.tomlCreate changefeed successfully!ID: 666-888-20220724-taskInfo: {"sink-uri":"mysql://dba:[email protected]: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://10.3.3.3:678Starting 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-taskStarting 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-taskStarting 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:[email protected]: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】：

([email protected]_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([email protected]_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_test2Database 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_testDatabase 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([email protected]_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-taskStarting 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-taskStarting 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-taskUsage:  cdc cli changefeed query [flags]Flags:  -c, --changefeed-id string   Replication task (changefeed) ID  -h, --help                   help for query  -s, --simple                 Output simplified replication statusGlobal 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-taskError: exit status 1Error: 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-taskStarting 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}