MTR: Application practice of MySQL testing framework in disaster recovery and fault recovery testing

MTR (MySQL Test Runner) is a powerful testing framework officially provided by MySQL. It is widely used in MySQL's disaster recovery and fault recovery testing. MTR can effectively verify the stability and reliability of MySQL in different environments by automating the execution of various test cases. In this article, we will introduce some basic concepts and usage of MTR, and demonstrate its application practice in disaster recovery and failure recovery testing through actual code examples.

1. Basic concepts of MTR

1. Entry (Test Case): An MTR test file is an entry, which contains a series of test cases.
2. Test Case: A test case is the smallest unit of MTR testing. It consists of several test steps.
3. Test Step: A test step is a specific operation or command for MySQL, such as creating a table, inserting data, etc.

2. Application practice of MTR in disaster recovery testing
In disaster recovery testing, we usually need to verify the disaster recovery capability and high availability of MySQL. The following is an example of a simple MTR test file, used to test the standby database switching function of MySQL.

--source include/have_innodb.inc

--connect (con1,127.0.0.1,root,,test)

--send CREATE USER 'repl'@'%' IDENTIFIED BY 'password';
--send GRANT REPLICATION SLAVE ON *.* TO 'repl'@'%';
--send FLUSH PRIVILEGES;

--connection con1
RESET MASTER;
SET @UUID := UUID();
CHANGE MASTER TO MASTER_HOST='127.0.0.1', MASTER_USER='repl',
  MASTER_PASSWORD='password', MASTER_AUTO_POSITION=1;
START SLAVE;
--connection default

...
--wait_timeout=300
--reconnect

--connection con1
STOP SLAVE IO_THREAD;
--connection default

--reconnect

--connection con1
START SLAVE IO_THREAD;
--connection default

--connection con1
EXECUTE start_slave_io_thread();
--connection default

--connection con1
RESET SLAVE ALL;
--connection default

...

The above MTR test file first needs to declare the use of the InnoDB engine, then create a user named repl and authorize it. Next, you will configure the relevant parameters of the master-slave library and start the replication process of the slave library. During the test, MySQL's standby database switching function was tested by stopping and starting the replication process from the slave database. Finally, verify whether the status of MySQL returns to normal by executing the RESET SLAVE ALL command.

3. Application practice of MTR in fault recovery testing
Fault recovery testing is mainly to verify the data recovery and consistency of MySQL after a failure. The following is an example of a simple MTR test file, used to test MySQL's binlog recovery function.

--source include/have_binlog_format_row.inc

--connect (con1,127.0.0.1,root,,test)

--connection con1
CREATE TABLE t (id INT PRIMARY KEY, name VARCHAR(50));
--connection default

--send UPDATE t SET name='test' WHERE id=1;

--wait_timeout=300
--reconnect

--connection con1
DROP TABLE t;
--connection default

--send INSERT INTO t VALUES (2, 'test2');

--wait_timeout=300
--reconnect

--connection con1
SELECT * FROM t;
--connection default

...

The above MTR test file first needs to declare the use of row-based binlog format, then create a table named t and insert a piece of data. During the test, MySQL's binlog recovery function was tested by deleting the table and re-inserting the data. Finally, verify whether the data is restored correctly by executing a SELECT statement.

IV. Summary
Through the above examples, we can see that MTR can achieve comprehensive testing of MySQL in terms of disaster recovery and fault recovery through flexible organization of test cases and test steps. In practical applications, we can write more complex test cases according to specific needs and combine them with other tools and scripts to further improve the testing effect. I hope this article can inspire the application practice of MTR and be helpful to readers.

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