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launch a cluster with 2 nodes under 10.0.20
convert a node to 10.1.6 without update datadir and launch it. it will provide many error with a lib C, without any clear msg. sorry I couldn't save error log because bank and was lazy to rewrite ...
After I deleted datadir of 10.1.6 and it's started well (I don't thought it was possible).
Have to test with some funny option like : replicate_events_marked_for_skip to see what happen.
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start with SST but couldn't be good because not the good version of systemes table.
In fact I have to back from begining lol
If not done yet, It would be good to document the recommended process of upgrading MGC nodes to a higher major server version.
I try to do that actually
Impossible to reproduce plz close it
i tried with new node
and I thought galera was include with MAriaDB and in Centos 6.x and i got one package for MariaDB server and one other for galera.
I tried to migrate and I made it without any problem.
stop server
remove package
update repo
install package
start server
and all fine except for some system table, but mysql started and joined cluster (first node was already in 10.1.6 and in cluster)
Even aside from Galera, when you start a 10.1 server on a 10.0 datadir, it should produce lots of error messages regarding wrong structure of system tables and such. Did you have those?
Why would you want to run a Galera node (or any server, for that matter) on a non-upgraded datadir? Obviously it won't work properly.