Migrate large database to galera cluster

[Hugo]

Hello,

I would like to migrate a large database from mysql 5.5.38 to our galera cluster 10.0.33
initially I wanted to dump the database and then restore the DB, but it takes too much time (arround 12h).

The DB size is arround 170 Gio

So I was wondering is there a way to create a master slave relation as follow :

- master : old server mysql 5.5.38
- slave : galera cluster

As galera is a 4 nodes cluster, which one will pull the query from master ? Is this a working setup ?

Regards,

[Matthew Frederico]

I would like to migrate a large database from mysql 5.5.38 to our galera cluster 10.0.33
initially I wanted to dump the database and then restore the DB, but it takes too much time (arround 12h).

The DB size is arround 170 Gio

We are currently using RDS and evaluating Galera for how feasible it may be in a multimaster multi-node environment.   Most of our data calls are reads, however we have about a 3GB database so bear that in mind as a benchmark for this.

I use this software: https://github.com/maxbube/mydumper

• On Export
• Regular mysqldump took about 8 - 10 minutes to pull our databases (3GB) from remote Amazon RDS. 
• using mydumper - dropped that time down to about 3 minutes.

Loading the export back took about 10 minutes into a primary node galera cluster instance (t2.small) even with myloader.  The slow import culprit appears to be transactional locks, which can be turned off.  So maybe do some estimation on performance from that.

[Hugo]

Hi,

I'll have a look. But clearly the horus of process are coming from the restore part.
Can you be more specific on disabling the transactional locks ?

Regards,