MariaDB Roadshow 2015 Helsinki case study: Migrating from MySQL master-slave to MariaDB Galera...
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About me Bachelor of Media Engineering Joined Verkkokauppa.com Oyj 2010 as
PHP developer Appointed DBA mid 2014
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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
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Daily averages IOPS 20 (peak 40) 0.2 MB/s (that includes binlog :-) Average 2000 qps Peaks 20000 qps 30 DML / s
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S3S2S1
MDML
SELECT
1 old master server 3 old binlog slaves
Old
Oh so slow...
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1 old master server 3 old binlog slaves 4 node tungsten cluster
T3T2T1 T4
treplicator
S3S2S1
MDML
SELECT
tconnector
SELECT
Old + tungstenSuperfast reports!
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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
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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!
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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
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1 old master 3 old binlog slaves 3 node galera cluster
treplicator
S3S2S1
M
tconnector
MariaDB+galera
G3G2G1
Remove tungsten
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1 master server 3 galera cluster 7 binlog slaves
S3S2S1 S4
S3S2S1
M
MariaDB+galera
G3G2G1
Cleanup
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3 galera cluster 4 binlog slaves S3S2S1 S4
M
MariaDB+galera
G3G2G1
Cleanup
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3 galera cluster 4 binlog slaves S3S2S1 S4
MariaDB+galera
G3G2G1
DML
SELECT
Current
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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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3 galera cluster 4 binlog slaves S3S2S1 S4
MariaDB+galera
G3G2G1DML
SELECTBinlogserver
MaxScale?
Future plans
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