[debian-mysql] Serious mess while upgrading mysql server

[Arto Jantunen]

Bjoern Boschman <bjoern at boschman.de> writes:

>>     My mysql admin was probably exagerating a little bit: the
>> incompatibility was actually "dynamic": the slave database, running version
>> 5.5.38 was unhappy to see that the master was running 5.5.40, because, just
>> by chance, it happened that I upgraded the master first.
>
> I'm still missing a bug report. what was done, what happened, what
> said the error-log, etc.

Mysql has never supported upgrading the master before upgrading the
slaves (the new version can process binary logs from an old version, but
not the other way around).

https://dev.mysql.com/doc/refman/5.5/en/replication-upgrade.html

A similar note is usually included in the release notes.

-- 
Arto Jantunen