Hi,
If we talking about synchronous replication then what problem with extending
shadow files feature to support it?
Regards,
Karol Bieniaszewski
----- Reply message -----
Od: "Jim Starkey" <j...@jimstarkey.net>
Do: <firebird-devel@lists.sourceforge.net>
Temat: [Firebird-devel] Replication
Data: śr., kwi 30, 2014 00:46
On 4/29/2014 8:38 AM, Dimitry Sibiryakov wrote:
> 29.04.2014 14:24, Carlos H. Cantu wrote:
>> You are right about the DB design, but that's up to the user. You
>> dont and should not worry with this.
> But the one who implements built-in replication will have to worry about
> conflict
> handling, constraint failure and so on.
> In the case of synchronous replication it is simple - you just raise
> error and the rest
> is up to user. Asynchronous replication is going to be more tricky.
>
It's a pity, but the journaling code that Borland ripped out in their
failed attempt at a write-ahead log would have been ideal for
master/slave replication. In a nutshell, what a page was changed, a
second BDB was allocated to hold page changes; if the buffer filled,
then the page itself was used. Before the actual page was written,
either the page or the set of page change delta was sent to the journal
(which would be the slave in replication). As all of the semantic
checking had already been performed, application at the slave was
simple, straightforward, and automatically followed careful write ordering.
But I suspect the code is long gone and probably next to impossible to
reconstruct as it was part and parcel of the origin Interbase design and
implementation.
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