[REVIEW] Subsection "Choosing a Data Store"

[Karl Heinz Marbaise]

Hi,

thanks for bringing up the light to me....

> It's a long known issue with FSFS:   each change uploaded goes into a
> txn/ directory as the commit progresses.  But when the commit is
> finalized, the FSFS code has to assemble lots of of small files in the
> txn/ directory into a single new revision file.  If the commit
> modified 20,000 files, then it may take a very long time to create the
> revision file.
> 
> In practice, it's not really an issue.  In theory, it's an edge-case
> of FSFS which doesn't scale well.

Might it be worth to put this kind of information into a footnote or
just give a very short information in the real text (Table and
subsection) whereas a footnote will explain this in detail...

> 
> 
> On Thu, Jun 12, 2008 at 8:48 AM, Karl Heinz Marbaise <khmarbaise at gmx.de> wrote:
>> Hi,
>>
>> i would like to ask a little bit about the subsection "FSFS" and the
>> Table 5.1 Repository data store comparison:
>>
>> Table 5.1.1:
>> "Faster overall, but finalization delay may cause client timeouts"
>> and
>>
>> Subsection "FSFS":
>> "FSFS also has a longer delay when finalizing a commit, which could"
>> "in extreme cases cause clients to time out while waiting for a response".
>>
>> Does this mean there is bug containing in SVN for FSFS or is this just
>> to give a hint about an "known issue" or does this have other
>> reasons...may be this can produce unstableness if read by users...
>>
>> AFAIK in SVN 1.5 there exist an opportunity to improve the commit speed
>> if you put the transaction area to an local hard drive whereas the db
>> area is living on a different kind of storage (e.g. SAN)...described in
>> the blog...
>>
>> May be someone can enlighten me a little bit about the above....
>>
>> Thanks in advance...
>>
>> Kind regards
>> Karl Heinz Marbaise
>> --
>> SoftwareEntwicklung Beratung Schulung    Tel.: +49 (0) 2405 / 415 893
>> Dipl.Ing.(FH) Karl Heinz Marbaise        ICQ#: 135949029
>> Hauptstrasse 177                         USt.IdNr: DE191347579
>> 52146 Würselen                           http://www.soebes.de
>>
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> 
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-- 
SoftwareEntwicklung Beratung Schulung    Tel.: +49 (0) 2405 / 415 893
Dipl.Ing.(FH) Karl Heinz Marbaise        ICQ#: 135949029
Hauptstrasse 177                         USt.IdNr: DE191347579
52146 Würselen                           http://www.soebes.de