Hi, Nirbhay! On Jul 28, Nirbhay Choubey wrote:

Hi Serg, Svoj!

I am looking into an issue where accessing oqgraph/connect engines from galera server leads to errors like "Unknown option '<table option>'" and segfaults. The issue being the differences in handlerton structure in galera and non-galera server codes.

Since the connect/oqgraph packages are built from non-galera server, when they are loaded into galera server, the engine's handlerton gets improperly initialized.

https://mariadb.atlassian.net/browse/MDEV-8240

I can think of the following potential solutions :

a) Club connect/oqgraph and mariadb-galera-server into a single package. (this would mean adding new dependencies to mariadb-galera-server) b) New packages for connect/oqgraph out of mariadb-galera build mariadb-connect-engine-galera-10.0, mariadb-oqgraph-engine-galera-10.0)

c) move wsrep additions to the end of the handlerton structure

Do you see any other option? Also, we should add some checks for plugin load to fail in first place in such scenarios.

wsrep patch is a hack on top of the server, there's no protection against it in the plugin api. nor against loading plugins into a debug server. or other stuff like that. but as far as galera is concerned, the issue will go away in 10.1, so I think we'll just wait and we'll be fine :) Regards, Sergei