maria-developers team mailing list archive

[Alex Yurchenko <alexey.yurchenko@xxxxxxxxxxxxx>]

On 2013-11-15 07:32, Pavel Ivanov wrote:
> Semi-sync replication for us is a DBA tool that helps to achieve
> durability of transactions in the world where MySQL doesn't do any
> flushes to disk. As you may guess by removing disk flushes we can
> achieve a very high transaction throughput. Plus if we accept the
> reality that disks can fail and repairing information from it is
> time-consuming and expensive (if at all possible), with such reality
> you can realize that flush or no flush there's no durability if disk
> fails, and thus disk flushes don't make much sense. So to get
> durability we use semi-sync. And definition of "durability" in this
> case is "if client gets ok on the transaction he will find this data
> after that". And that should stand in case of any master failures and
> failovers.

Hi Pavel,

Please pardon this arrogant interruption of your discussion and 
shameless self-promotion, but I just could not help noticing that Galera 
replication was designed specifically with these goals in mind. And it 
does seem to achieve them better than semi-sync plugin. Have you 
considered Galera? What makes you prefer semi-sync over Galera, if I may 
ask?

Kind regards,
Alex

> Pavel
>
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--
Alexey Yurchenko,
Codership Oy, www.codership.com
Skype: alexey.yurchenko, Phone: +358-400-516-011