You cannot cluster JIRA unless you are using JIRA Data Centre (which is a whole different discussion), so this probably isn't going to work the way you think it might.
For MySQL, the applications require a row-level lock (see https://confluence.atlassian.com/adminjiraserver071/connecting-jira-applications-to-mysql-802592179.html ) which generally means you need READ-COMMITTED not repeatable-read. I don't know enough about repeatable-read to know if it can be used as a row-level lock.
Thanks for your reply & sorry for my bad English, but i mean when i configure Galera Cluster in multi-master mode(MySQL DB) to use for my applications(Jira, Confluence) i must use transaction isolation level is REPEATABLE-READ, cannot use other level. (see http://galeracluster.com/documentation-webpages/isolationlevels.html )
Are there any problems with this configuration? and Can i use other transaction isolation level as REPEATABLE-READ instead of READ-COMMITTED for my applications?
Your English is good, but it's a complex language sometimes. Even as it is my first language, I find it is very easy to misunderstand what people have written. I think you were very clear.
So, yes, there are problems with your configuration. The Atlassian applications need to be run with READ-COMMITTED (unless you are using a Data Centre version). From the documentation you've provided, it's quite clear that Galera does not support that when it is running in multi-master node and hence you cannot use it for your Atlassian databases. That does make sense to me - JIRA cannot be clustered, and can only really be used with master-slave database clusters, where the slaves are for backups or (ugh) reporting. (Again, unless you are using JDC)
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