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Re: BDB vs FSFS - OMG!

From: Branko Čibej <brane_at_wandisco.com>
Date: Mon, 07 Jan 2013 16:07:20 +0100

On 07.01.2013 15:52, C. Michael Pilato wrote:
> On 01/07/2013 06:12 AM, Justin Erenkrantz wrote:
>> On Sun, Jan 6, 2013 at 9:44 PM, C. Michael Pilato <cmpilato_at_collab.net
>> <mailto:cmpilato_at_collab.net>> wrote:
>> hosted elsewhere for them. The BDB backend (thanks to improvements to the
>> Berkeley DB library itself) is much more stable today than it was when we
>> first started this project, so it's quite possible that we don't hear noise
>> That's quite surprising. My understanding from the Sleepycat/Oracle team
>> way back when was that our core usage of BDB was wrong and would never be
>> properly supported by them. Have they embraced multiple reader/writer
>> processes now, or do they still advocate that having a single-process is the
>> only Right Way(tm)? -- justin
> Subversion's core usage of BDB arguably helped to advance the state of the
> Berkeley DB art. Multi-process support has been officially part of the
> Berkeley DB API since at least the 4.4 release (Branko will remember the
> original DB_REGISTER work, I'm sure). And just few years ago I was even
> having private conversations in which ex-Sleepycat folk were trying to urge
> the Subversion project to further embrace Berkeley DB, specifically its
> built-in database replication support. Single-process (via a brokering
> daemon) is still the recommended approach, of course, but my understanding
> is that it's no longer considered the Only Right Way.

Nevertheless the situation we have now is what it is. I see only two
ways forward: stop supporting BDB (eventually), or invest serious effort
into making it competitive. If we decide for the latter, it should be
for good reasons; maintaining two back-ends is, as we know, a big

Personally I would rather spend that time doing sexy new things, such as
the FSv2 API (getting rid of DAGs in the FS interface would be a good
thing), better merging, replacing externals, etc. etc.

-- Brane

Branko Čibej
Director of Subversion | WANdisco | www.wandisco.com
Received on 2013-01-07 16:07:55 CET

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