ProxySQL

ProxySQL

Подготовка

сделать три ноды
- мастер
-2 слейва

CREATE DATABASE vena_test_db;
USE vena_test_db;
CREATE TABLE master_table (id INT(6) UNSIGNED AUTO_INCREMENT PRIMARY KEY, data varchar(255) NOT NULL);
INSERT INTO master_table VALUES(1, 'data1');
GRANT ALL ON vena_test_db.* to 'vena_test_user'@'%' identified by 'vena_test_password';

На обоих слейвах

USE vena_test_db;
CREATE TABLE slave_table (id INT(6) UNSIGNED AUTO_INCREMENT PRIMARY KEY, data varchar(255) NOT NULL);
INSERT INTO slave_table VALUES(1, 'slave-data1');
GRANT ALL ON vena_test_db.* to 'vena_test_user'@'%' identified by 'vena_test_password';

на ProxySQL

INSERT INTO mysql_servers(hostgroup_id, hostname, port) VALUES (20, 'mysql-slave-1', 3306);
INSERT INTO mysql_servers(hostgroup_id, hostname, port) VALUES (20, 'mysql-slave-2', 3306);
INSERT INTO mysql_servers(hostgroup_id, hostname, port) VALUES (10, 'mysql-master', 3306);

INSERT INTO 
    mysql_group_replication_hostgroups (writer_hostgroup, backup_writer_hostgroup, reader_hostgroup, offline_hostgroup, active, max_writers, writer_is_also_reader, max_transactions_behind) 
    VALUES                             (10,               11,                      20,               1,                 1,      3,           0,                     100);

INSERT INTO 
    mysql_users(username,          password,            default_hostgroup) 
	VALUES     ('vena_test_user', 'vena_test_password', 20);



INSERT INTO 
    mysql_query_rules (rule_id, active, match_pattern,            destination_hostgroup, apply) 
    VALUES            (1,       1,      '^SELECT .* FOR UPDATE$', 10,                    1);

INSERT INTO 
    mysql_query_rules (rule_id, active, match_pattern,            destination_hostgroup, apply) 
    VALUES            (1,       1,      '^SELECT',                20,                    1);

INSERT INTO 
    mysql_query_rules (rule_id, active, match_pattern,            destination_hostgroup, apply) 
    VALUES   

Проверить: http://lefred.be/content/mysql-group-replication-native-support-in-proxysql/

Ссылки

• Переменные :https://github.com/sysown/proxysql/wiki/Global-variables#mysql-monitor_username-mysql-monitor_password
• https://www.digitalocean.com/community/tutorials/how-to-use-proxysql-as-a-load-balancer-for-mysql-on-ubuntu-16-04

https://github.com/sysown/proxysql/tree/master/doc

Репликация

• http://highload.guide/blog/mysql-replication.html
• http://docplayer.ru/26091768-Asinhronnaya-replikaciya-mysql-bez-cenzury-oleg-caryov.html

Мульти-сорс репликация

• https://habrahabr.ru/post/276581/

GTID

* https://habrahabr.ru/post/276581/
* https://habrahabr.ru/post/262925/ 
* https://www.youtube.com/watch?v=v68l2YOur5M

GTID DEBUG

 Last_SQL_Error: Could not execute Delete_rows event on table vena_test_db.master_table; Can't find record in 'master_table', Error_code: 1032; handler error HA_ERR_KEY_NOT_FOUND; the event's master log mysql-bin.000001, end_log_pos 455

• https://www.fromdual.ch/replication-troubleshooting-classic-vs-gtid