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Message #04712
Re: MDEV-136 Non-blocking "set read_only"
Sergei,
16.05.2012 15:21, Sergei Golubchik wrote:
Okay. But is it correct? Can you try the following:
> 1st client: LOCK TABLE t1 WRITE;
done
> 2nd client: SET READ_ONLY=1;
hangs, as it's blocked by LOCK TABLE
> 1st client: INSERT t1 VALUES (1);
insert succeeded.
1st client UNLOCK TABLES;
2nd completes the SET READ_ONLY
> I'm not sure about it. It's basically a gotcha.
> "SET READ_ONLY will not flush transactional tables,
> but only if the statement uses no non-transactional tables.
> Otherwise it'll flush all tables, transactional or not". One cannot
always know if non-transactional tables are involved. Think of > log
tables, tables used in triggers and stored routines.
Well i don't have an opinion of my own on that.
Unfortunately i don't know that area well enough.
Ok i started investigating and hope to come out with something better
tomorrow.
Regards
HF
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