My SQL Replication and Scaling

MySQL Replication MySQL Replication & &

ScalingScaling

Presenter: Avishek Kumar SharmaMindfire Solutions

Date: 29/10/2014

OCP MySQL 5.0 - Oracle Certified Professional

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Today's Talk

1. Replication- brief introduction2. Multiple MySQL Instances3. Replication Topology4. Setting up Replication (Demo) - Master Configurations - Binlog - Replication User - Slave Configurations - Relaylog - Replication Thread - Start Slave5. Trouble Shooting Replication6. Replication Compatibility and Upgrading7. Replication and Scaling-out8. Backup and replication(HA/Fault Tolerance)

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Replication- brief intro

- Capability that allows the databases on one server(the master) to be made available on another servers(the slaves).

- Replication was introduced in MySQL version 3 and matured to a robust, stable technology as of MySQL 4.0.2.

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Multiple MySQL Instances

Multiple MySQL server instances on a single host. - new release testing - administrative work

Caution: - separate data-dir(unless readonly) - separate network interfaces - TCP/IP port - socket files - separate log/PID file

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Replication Topology

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Setting up Replication (demo)- Sync both databases.- Master Configurations - Enable binlog

- set log_bin = /var/log/mysql/mysql-bin.log - Replication User

- CREATE USER `replicator`@localhost IDENTIFIED BY `mindfire`;- GRANT REPLICATION SLAVE ON *.* TO replicator@localhost;

- Slave Configurations - Relaylog(optional)

- relay-log = /var/lib/mysql/slave-relay.log- Set Master host

- CHANGE MASTER TOMASTER_HOST = 'localhost',MASTER_USER = 'replicator',MASTER_PORT = 3306,MASTER_PASSWORD = "mindfire",MASTER_LOG_FILE = 'mysql-bin.000001',MASTER_LOG_POS = 120;

- Start Slave- START SLAVE;

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Trouble Shooting Replication

- If slave is running ?

- SHOW SLAVE [IO_THREAD/SQL_THREAD] STATUS;

if not, issue:

- START SLAVE [IO_THREAD/SQL_THREAD];

- monitor slave log.

- master/slave have unique server-ids ?

- binary_logging enabled on master ?

- SHOW VARIABLES LIKE "log_bin";

- connect master host from mysql client ?

- error information for “SHOW SLAVE STATUS”

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Replication Compatibility and Upgrading

- Slave trouble parsing binary log file sent from master.

- replication compatibility is the best when both master and slave run on same server version.

- as a general rule “upgrade slave before upgrading master”

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Replication and “Scaling-out”

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reads = 1200 - 2 * writes

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Backup and replication(HA/Fault Tolerance)

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before redundancy:

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Master went down, Slave 1 as new Master.(monitor replication heartbeat)

1. On each slave, - STOP SLAVE IO_THREAD(check the output of SHOW PROCESSLIST until you see Has read all relay log)

2. On the slave Slave 1,- STOP SLAVE- RESET MASTER.

3. On the other slaves Slave 2 and Slave 3, - STOP SLAVE - CHANGE MASTER TO MASTER_HOST='Slave1'- START SLAVE

4. tell each Web Client to direct its statements to Slave 1.

NB: Slaves must be running with --log-bin and without –log-slave-updates.

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after redundancy:

NB: after the master being available again, it has to become slave of “Slave 1” first for being updated with all missed events before it become Master again.

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References

http://dev.mysql.com/doc/refman/5.6/en/replication.html

http://dev.mysql.com/doc/refman/5.6/en/replication-solutions-scaleout.html

http://dev.mysql.com/doc/refman/5.6/en/replication-solutions-switch.html

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Thank you :)Thank you :)

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