mariadb roadshow 2015 helsinki case study: migrating from mysql master-slave to mariadb galera...
Post on 20-Jul-2015
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About me● Bachelor of Media Engineering● Joined Verkkokauppa.com Oyj 2010 as
PHP developer● Appointed DBA mid 2014
Database● Created 2001, very little cleanup, normalization● Customers, orders, purchases, warehouse,
shipments, accounting, POS etc.● ~300 tables, latin1 and UTF-8 mixer● Peaked at 100 GB, currently 70 GB● Heading for 50 GB● Separate log db 20 GB
Daily averages● IOPS 20 (peak 40) ● 0.2 MB/s (that includes binlog :-)● Average 2000 qps ● Peaks 20000 qps● 30 DML / s
• 1 old master server• 3 old binlog slaves• 4 node tungsten cluster
T3T2T1 T4
treplicator
S3S2S1
MDML
SELECT
tconnector
SELECT
Old + tungstenSuperfast reports!
● Tungsten Enterprise 1.5.3 (early 2013)● Very feature rich (oracle, multi-source, topologies, WAN
replication)
Some issues we had● Sudden death of M->T replicator● Latin1/UTF-8 bug● A lot of configuration files and logs, services making
troubleshooting hard● Changing master “SWITCH TO” caused outage
Tungsten
● Replication is ROW based, therefore “ALTER … ADD PRIMARY KEY”
● Only supports InnoDB, therefore “ALTER … ENGINE=InnoDB”
● OPTIMIZE tables
● Provision nodes from a backup and start replicating from current master
Galera cluster ahead!
• 1 old master server• 3 old binlog slaves• 4 node tungsten cluster• 3 node galera cluster
T3T2T1 T4
treplicator
S3S2S1
M
tconnector
MariaDB+galera
G3G2G1
Galera cluster with old and tungsten
• 1 old master• 3 old binlog slaves• 3 node galera cluster
treplicator
S3S2S1
M
tconnector
MariaDB+galera
G3G2G1
Remove tungsten
• 1 master server• 3 galera cluster• 7 binlog slaves
S3S2S1 S4
S3S2S1
M
MariaDB+galera
G3G2G1
Cleanup
MariaDB+Galera on virtual host● Take node out of rotation at any time ● Move virtual server between our Dcs.
Triggers IST if you're on a slow link.● Redundency● Not a single connection is lost
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