I agree the wording is a little confusing but you are correct that the server will decide between IST and SST based on whether galera.cache is large enough to hold the write sets that occur during the upgrade. Note that if an SST is required then the changes to the table structure made by mysql_upgrade will be undone.

Bryan

On Jun 19, 2015, at 3:30 PM, Tom Worster <fsb@thefsb.org> wrote:

Thanks Guillaume.

The doc says

Unless you use Incremental State Transfer, as you bring each node back online after an upgrade, it initiates a full State Snapshot Transfer, which can take a long time to process on larger databases and slower state transfer methods.

The wording suggests that it's up to me to choose IST. But isn't it the case that the server choses IST or SST, depending on whether galera.cache has enough writesets for an IST?


From: Guillaume Lefranc <guillaume@adishatz.net>
Date: Friday, June 19, 2015 at 1:22 PM
To: Tom Worster <fsb@thefsb.org>
Cc: maria-discuss email list <maria-discuss@lists.launchpad.net>
Subject: Re: [Maria-discuss] Upgrading mariadb-galera-server

Yes.
http://galeracluster.com/documentation-webpages/upgrading.html

2015-06-19 18:55 GMT+02:00 Tom Worster <fsb@thefsb.org>:
Can I upgrade a production cluster from 10.0.15 to 10.0.19 while the cluster remains in service, upgrading one node at a time?

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