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【项目实战经验】DataKit迁移MySQL到openGauss（下）

2024-04-19 11:00 https://my.oschina.net/gaussdb/blog/11053397 Gauss松鼠会次阅读条评论

上一篇我们分享了安装、设置、链接、启动等步骤，本篇我们将继续分享迁移、启动~

9. 离线迁移

9.1. 迁移插件安装

中断安装，比如 kill 掉java进程（安装失败也要等待300s）

update tb_migration_host_portal_install set install_status=10;

下载安装包准备上传

缺少mysqlclient lib包

mysql如果是二进制安装的话，我这个版本是没有18这个lib包的

[root@mysqldb lib]# ls -ltrh /usr/local/mysql/lib
total 1001M
-rw-r--r-- 1 mysql mysql 392M Jun 21  2023 libmysqld-debug.a
-rw-r--r-- 1 mysql mysql  43K Jun 21  2023 libmysqlservices.a
-rwxr-xr-x 1 mysql mysql  11M Jun 21  2023 libmysqlclient.so.20.3.30
-rw-r--r-- 1 mysql mysql  26M Jun 21  2023 libmysqlclient.a
-rw-r--r-- 1 mysql mysql 574M Jun 21  2023 libmysqld.a
lrwxrwxrwx 1 mysql mysql   25 Jun 21  2023 libmysqlclient.so.20 -> libmysqlclient.so.20.3.30
lrwxrwxrwx 1 mysql mysql   20 Jun 21  2023 libmysqlclient.so -> libmysqlclient.so.20
drwxr-xr-x 2 mysql mysql   28 Jan 10 13:36 pkgconfig
drwxr-xr-x 4 mysql mysql   28 Jan 10 13:36 mecab
drwxr-xr-x 3 mysql mysql 4.0K Jan 10 13:36 plugin
lrwxrwxrwx 1 root  root    25 Jan 10 14:41 libmysqlclient.so.18 -> libmysqlclient.so.20.3.30

在porta安装日志下面，会有如下报错

[root@mysqldb logs]# cat /ops/portal/error.log 
/ops/portal/tools/chameleon/chameleon-5.1.0
install.sh: /ops/portal/tools/chameleon/chameleon-5.1.0/venv/bin/chameleon: /venv/bin/python3.6: bad interpreter: No such file or directory
Traceback (most recent call last):
  File "/ops/portal/tools/chameleon/chameleon-5.1.0/venv/lib/python3.6/site-packages/MySQLdb/__init__.py", line 18, in <module>
    from . import _mysql
ImportError: libmysqlclient.so.18: cannot open shared object file: No such file or directory

During handling of the above exception, another exception occurred:

查看到符合当前mysql的版本，通过yum安装即可

Installed:
  mysql-community-libs-compat.x86_64 0:5.7.44-1.el7                                                                             

Complete!
[root@datakit bin]# rpm -ql mysql-community-libs-compat-5.7.44-1.el7.x86_64
/etc/ld.so.conf.d/mysql-x86_64.conf
/usr/lib64/mysql
/usr/lib64/mysql/libmysqlclient.so.18
/usr/lib64/mysql/libmysqlclient.so.18.1.0
/usr/lib64/mysql/libmysqlclient_r.so.18
/usr/lib64/mysql/libmysqlclient_r.so.18.1.0
/usr/share/doc/mysql-community-libs-compat-5.7.44
/usr/share/doc/mysql-community-libs-compat-5.7.44/LICENSE
/usr/share/doc/mysql-community-libs-compat-5.7.44/README

其他有用命令

# 重新加载lib库
/sbin/ldconfig -v
# 查看位置
locate libmysql
# 手动配置lib库
vi /etc/ld.so.conf.d/mysql.conf
# 查看是否有对应的lib库
ldconfig -p|grep mysql

ldconfig，此时安装迁移插件应该没有问题

[root@mysqldb lib]# ldconfig -p|grep mysql
        libmysqlclient.so.20 (libc6,x86-64) => /usr/local/mysql/lib/libmysqlclient.so.20
        libmysqlclient.so.20 (libc6,x86-64) => /usr/lib64/mysql/libmysqlclient.so.20
        libmysqlclient.so.18 (libc6,x86-64) => /usr/lib64/mysql/libmysqlclient.so.18
        libmysqlclient.so (libc6,x86-64) => /usr/local/mysql/lib/libmysqlclient.so

如果是在线安装，会遇到403错误，现在要登陆了才能下载

download portal package failed: 
--2024-01-09 12:11:24--  https://opengauss.obs.cn-south-1.myhuaweicloud.com/latest/tools/PortalControl-5.1.0.tar.gz
Resolving opengauss.obs.cn-south-1.myhuaweicloud.com (opengauss.obs.cn-south-1.myhuaweicloud.com)... 122.9.127.163, 122.9.127.162
Connecting to opengauss.obs.cn-south-1.myhuaweicloud.com (opengauss.obs.cn-south-1.myhuaweicloud.com)|122.9.127.163|:443... connected.
HTTP request sent, awaiting response... 403 Forbidden
2024-01-09 12:11:25 ERROR 403: Forbidden.

出现如下提示最终还是能成功安装的：

/ops/portal/tools/chameleon/chameleon-5.1.0 
install.sh: /ops/portal/tools/chameleon/chameleon-5.1.0
/venv/bin/chameleon: /venv/bin/python3.6: bad interpreter: No such file or directory

安装成功后的截图

主机上有对应的进程

[root@mysqldb alternatives]# jps
19073 QuorumPeerMain
19122 SupportedKafka
4874 Jps
19487 SchemaRegistryMai

10. 全量迁移

10.1. 选中主机，启动迁移

10.2. 迁移中

10.3. 迁移结束

10.4. 日志所在目录

[root@mysqldb datacheck]# pwd
/ops/portal/workspace/2/logs/datacheck
[root@mysqldb datacheck]# ls -ltrh
total 36K
-rw-rw-r-- 1 appadm appadm 2.2K Jan 10 15:31 business-source.log
-rw-rw-r-- 1 appadm appadm 2.1K Jan 10 15:31 business-sink.log
-rw-rw-r-- 1 appadm appadm  282 Jan 10 15:31 business-check.log
-rw-rw-r-- 1 appadm appadm 3.1K Jan 10 15:31 source.log
-rw-rw-r-- 1 appadm appadm 3.3K Jan 10 15:31 sink.log
-rw-rw-r-- 1 appadm appadm  422 Jan 10 15:31 kafka-sink.log
-rw-rw-r-- 1 appadm appadm  422 Jan 10 15:31 kafka-source.log
-rw-rw-r-- 1 appadm appadm 3.3K Jan 10 15:31 check.log
-rw-rw-r-- 1 appadm appadm 2.1K Jan 10 15:31 kafka-check.log

[root@mysqldb datacheck]# ls -l /ops/portal/workspace/2/logs/
total 24
drwxrwxr-x 2 appadm appadm   204 Jan 10 15:30 datacheck
drwxrwxr-x 2 appadm appadm    51 Jan 10 15:30 debezium
-rw-rw-r-- 1 appadm appadm   162 Jan 10 15:31 error.log
-rw-rw-r-- 1 appadm appadm 17400 Jan 10 15:31 full_migration.log

[root@mysqldb datacheck]# find /ops -name schema-registry.log
/ops/portal/workspace/2/logs/debezium/schema-registry.log
/ops/portal/tools/debezium/confluent-5.5.1/logs/schema-registry.log

11. 增量迁移

11.1. PG里面创建第二个库

create database world2 with dbcompatibility='b';

11.2. 创建在线迁移任务

11.3. 启动

全量迁移完成并校验成功后进入增量迁移

11.4. 在mysql端进行DDL和DML

mysql 端进行了5个事务

root@localhost 16:08:00 [world]> create table t1(id int primary key,name varchar(32));
Query OK, 0 rows affected (0.01 sec)

root@localhost 16:08:31 [world]> insert into t1 values(1,'zhangsan');
Query OK, 1 row affected (0.01 sec)

root@localhost 16:08:45 [world]> insert into t1 values(2,'22'),(3,'33');
Query OK, 2 rows affected (0.01 sec)
Records: 2  Duplicates: 0  Warnings: 0

root@localhost 16:09:00 [world]> create table city_copy like city;
Query OK, 0 rows affected (0.03 sec)

root@localhost 16:09:22 [world]> insert into city_copy select * from city;
Query OK, 4079 rows affected (0.06 sec)
Records: 4079  Duplicates: 0  Warnings: 0

上面一直卡住，再起一个的时候报错（内存不足）：

OpenJDK 64-Bit Server VM warning: INFO: os::commit_memory(0x0000000680000000,

中间还有一次翻车了

py_opengauss.exceptions.ClientCannotConnectError: could not establish connection to server
CODE: 08001
LOCATION: CLIENT
CONNECTION: [failed]
failures[0]:
socket('192.168.2.3', 5432)
py_opengauss.exceptions.InsufficientPrivilegeError: Please use the original role to connect B-compatibility database first, to load extension dolphin
CODE: 42501
LOCATION: SERVER
CONNECTOR: [IP4] pq://datakit:***@192.168.2.3:5432/world4?[sslmode]=disable
category: None
DRIVER: py_opengauss.driver.pq3.Driver

第6次增量

在mysql端进行增删改和DDL

root@localhost 16:48:04 [world]> delete from t1 where id=3;
Query OK, 1 row affected (0.01 sec)

root@localhost 16:48:12 [world]> insert into t1 values(4,44);
Query OK, 1 row affected (0.01 sec)

root@localhost 16:48:24 [world]> update t1 set name=222 where id=2;
Query OK, 1 row affected (0.00 sec)
Rows matched: 1  Changed: 1  Warnings: 0

root@localhost 16:48:36 [world]> update t1 set name=2223 where id=2;
Query OK, 1 row affected (0.00 sec)
Rows matched: 1  Changed: 1  Warnings: 0

root@localhost 16:49:03 [world]> create table t2 (id int primary key, name char(20));
Query OK, 0 rows affected (0.01 sec)

root@localhost 16:49:41 [world]> insert into t2 select * from t1;
Query OK, 3 rows affected (0.01 sec)
Records: 3  Duplicates: 0  Warnings: 0

停止增量

12. 反向迁移

12.1. 在PG端进行增删改

world4=# \c world4
Non-SSL connection (SSL connection is recommended when requiring high-security)
You are now connected to database "world4" as user "omm".
world4=# set search_path=world;
SET
world4=# select * from t2;
 id |         name         
----+----------------------
  1 | zhangsan            
  2 | 2223                
  4 | 44                  
(3 rows)

world4=# insert into t2 values(5,55);
INSERT 0 1
world4=# update t2 set name=5555 where id=5;
UPDATE 1
world4=# delete from t2 where id=1;
DELETE 1

12.2. PG端DDL

PG建表无法同步到mysql，但是继续在PG继续进行DML，原有表的数据依然能同步到mysql

orld4=# create table pg_table( id bigint primary key);
NOTICE:  CREATE TABLE / PRIMARY KEY will create implicit index "pg_table_pkey" for table "pg_table"
CREATE TABLE
world4=# create table t3(id bigint primary key);
NOTICE:  CREATE TABLE / PRIMARY KEY will create implicit index "t3_pkey" for table "t3"
CREATE TABLE
world4=# show tables;
 Tables_in_world 
-----------------
 city
 city_copy
 country
 countrylanguage
 pg_table
 t1
 t2
 t3
(8 rows)

world4=# update t2 set name=55555555 where id=5;              
UPDATE 1
world4=# create table t4(id bigint);
CREATE TABLE
world4=# insert into t4 values(1),(2);
INSERT 0 2
world4=# select * from t4;
 id 
----
  1
  2
(2 rows)

root@localhost 17:01:41 [world]> show tables;
+-----------------+
| Tables_in_world |
+-----------------+
| city            |
| city_copy       |
| country         |
| countrylanguage |
| t1              |
| t2              |
+-----------------+
6 rows in set (0.00 sec)

root@localhost 17:03:08 [world]> select * from t2;
+----+----------+
| id | name     |
+----+----------+
|  2 | 2223     |
|  4 | 44       |
|  5 | 55555555 |
+----+----------+
3 rows in set (0.00 sec)

至此，迁移部分实践分享结束，欢迎大家一起交流学习。

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