maria-discuss team mailing list archive

[Gordan Bobic <gordan.bobic@xxxxxxxxx>]

"Starting from MariaDB 10.5.7 ..."

Unfortunately, 10.5+ is not an option at the moment for the
environment where I need this to work.

On Sun, May 29, 2022 at 1:13 PM Sergei Golubchik <serg@xxxxxxxxxxx> wrote:
>
> Hi, Gordan,
>
> Would it work if you install "mysql_json" plugin in the MariaDB and then
> replicate MySQL->MariaDB?
>
> I didn't try myself, but I've checked the sources and it appears that it
> was supposed to work.
>
> If it won't - please, report it as a bug.
>
> On May 29, Gordan Bobic wrote:
> > On this page:
> > https://mariadb.com/kb/en/json-data-type/
> >
> > it states:
> > If you must use row-based replication and cannot change the MySQL
> > master from JSON to TEXT, you can try to introduce an intermediate
> > MySQL slave and change the column type from JSON to TEXT on it. Then
> > you replicate from this intermediate slave to MariaDB.
> >
> > I can confirm that this does not work with MySQL 5.7. If you have a
> > 5.7 master and you replicate to 5.7 slave, and you convert the slave's
> > json columns to longtext, replication fails with this error:
> >
> > "Column X of table 'dbname.tablename' cannot be converted from type
> > 'json' to type 'longtext'"
> >
> > Using longblob doesn't work either.
> >
> > So it seems there is currently no viable solution for replicating
> > anything that involves JSON columns from MySQL to MariaDB.
> >
> Regards,
> Sergei
> VP of MariaDB Server Engineering
> and security@xxxxxxxxxxx