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Re: Lack of Subversion repository recovery tools

From: Toby Thain <toby_at_smartgames.ca>
Date: 2007-06-29 18:59:00 CEST

On 29-Jun-07, at 12:26 PM, david.x.grierson@jpmorgan.com wrote:

> Toby wrote:
>> On 29-Jun-07, at 11:35 AM, david.x.grierson@jpmorgan.com wrote:
>>> ...
>>> check-state against the FSF database to ensure that it's in a
>>> consistent
>>> state - and knew what kind of common issues might exist and what the
>>> regular fixes for those might be.
>>
>> And this is why I single out "software causes", because if you KNOW
>> what the common "issues" are, THEY GET FIXED, and the administrative
>> remedy is to install the fix. Additionally, in the case of a known
>> bug, it may be possible to characterise the damage caused, and make a
>> tool (if necessary) to repair this *specific* damage.
>
> Except that upgrading is time costly (testing, validation, arranging
> downtime, etc. etc.) and so some organisations (e.g. investment
> banks) are
> upgrade unfriendly so keeping on the latest & greatest isn't always an
> option.
>
> Consider the following scenario: Let's say you're running version
> 1.4.7
> and the latest version is 1.5.3.
>
> 1.4.7 contains a defect which under certain circumstances can cause
> the
> repository to become corrupted.
>
> This defect was identified in version 1.4.8 but wasn't actually fixed
> until version 1.5.0 because it required a re-design of aspects of the
> repository format which wouldn't have been appropriate to issue in
> a point
> release of the product.

Very unlikely.

In the more likely scenario of a corruption bug in 1.4.7, if it were
serious, it would merit a 1.4.8.

--Toby

>
> If an organisation were to experience this corruption whilst
> running 1.4.7
> - what should they do?
>
> Option A) Upgrade their servers to (at least) 1.5.0 to get the
> defect fix
> and go through all of the pain associated with the upgrade (testing
> of all
> new features, dump/load of repositories, etc. etc.)
>
> Option B) Have a fixer tool included in version 1.4.8 which
> understands
> repository formats which may experience this corruption (or
> downloadable
> as a support tool for circumstances such as these).
>
> I'd say it's more mature for any SCM vendor (be they open-source,
> commercial or otherwise) to acknowledge such an issue, release a tool
> which can repair any damage which *could* occur while they work on
> a full
> fix.
>
> Dg.
>
>
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Received on Fri Jun 29 18:59:13 2007

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