MTR: Application practice of MySQL testing framework in multi-machine and multi-instance scenarios

MTR: The application practice of MySQL testing framework in multi-machine and multi-instance scenarios

Introduction:
MySQL is one of the most popular relational database management systems at present and is widely used in various scales. application. During the development process, in order to ensure the stability and performance of MySQL, it is very important to conduct comprehensive testing. MySQL has a powerful testing framework, MTR (MySQL Test Framework), which can help developers effectively conduct various tests. This article will introduce the application practice of MTR in multi-machine and multi-instance scenarios and provide code examples.

1. Introduction to MTR
MySQL Test Framework (MTR for short) is a powerful testing tool officially provided by MySQL. The design goal of MTR is to enable comprehensive, automated test coverage to ensure the reliability and performance of MySQL in various scenarios.

MTR’s core features include:

1. Supports multiple types of testing, including unit testing, integration testing, performance testing, etc.
2. Provides a wealth of testing tools and settings, enabling flexible test configuration and environment settings.
3. Supports multiple operating system platforms and MySQL versions, with high compatibility.

2. Application practice of MTR in multi-machine and multi-instance scenarios
In actual applications, MySQL is usually deployed on multiple machines, and each machine may have multiple MySQL instance. For this multi-machine multi-instance scenario, using MTR for testing can better simulate the real production environment and improve test coverage and reliability.

The following takes a scenario as an example to introduce the application practice of MTR in a multi-machine multi-instance scenario.

1. Scenario description
   Suppose we have three machines, namely A, B, and C. Two MySQL instances are deployed on each machine, namely A1, A2, B1, B2, C1, C2.
2. MTR configuration
   First, we need to configure MTR on each machine. In the installation directory of each MySQL instance, you can find a directory named mtr, which contains an mtr configuration file, which can be modified as needed.

The following is an example mtr configuration file:

# This is the master configuration file for all tests
# that are run from this installation.

# Variables specific to a system
mysqltest = /path/to/mysql/test/db_client


# Configuration for test suite "multi-instance"
[multi-instance]
# Test cases for the multi-instance test suite
testdir = /path/to/mysql/test
testcase_timeout = 3600
repeat = 1
master_port = 3306
master_mysqld = /path/to/mysql/bin/mysqld
master_socket = /path/to/mysql/tmp/mysql.sock
master_extra_args = --defaults-file=/path/to/mysql/my.cnf


# Configuration for test case "test1"
[test1]
# The test case name
testcase = test1
# Test case specific variables
master_port = 3306
master_mysqld = /path/to/mysql/bin/mysqld
master_socket = /path/to/mysql/tmp/mysql.sock
master_extra_args = --defaults-file=/path/to/mysql/my.cnf

# Configuration for test case "test2"
[test2]
# The test case name
testcase = test2
# Test case specific variables
master_port = 3307
master_mysqld = /path/to/mysql/bin/mysqld
master_socket = /path/to/mysql/tmp/mysql.sock
master_extra_args = --defaults-file=/path/to/mysql/my.cnf

In the configuration file, we can set the port number, mysqld path, socket path, and additional settings of each MySQL instance according to the actual situation. Parameters etc.

3. Writing test cases
   In the MySQL test framework, each test is an independent test case that can be written for a specific function or scenario.

The following is an example test case, which tests the insert function of a table in database A1:

--source include/master-slave.inc

--connection master
CREATE TABLE test_table (id INT PRIMARY KEY, name VARCHAR(20));

--connection master
INSERT INTO test_table VALUES (1, 'Alice'), (2, 'Bob');

--connection slave
SELECT * FROM test_table;

In this test case, we first connect to the master Create a table, insert two pieces of data under the master connection, and finally query the data under the slave connection.

4. Run the test
   After configuring MTR and writing test cases, we can use the mtr command to run the test.

The following is an example command line:

/path/to/mysql/test/mysql-test-run.pl --suite=multi-instance --tests=test1,test2

We can specify the test suite (suite) and test cases (tests) to be run, and then MTR will automatically Start the corresponding MySQL instance on each machine and execute the test case.

Summary:
MTR is a very powerful MySQL testing framework that can help developers conduct comprehensive and automated test coverage. In a multi-machine multi-instance scenario, the application practice of MTR can better simulate the real production environment and improve the reliability and coverage of testing. By configuring MTR and writing test cases, we can easily conduct various MySQL tests to ensure the stability and performance of MySQL in various scenarios.

Please see the attachment for code examples.

Attachment: Code sample file

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