[leafnode-list] Re: Spool permissions in leafnode-2

["Matthias Andree" <matthias.andree@xxxxxx>]

Am 14.04.2009, 14:23 Uhr, schrieb Adam Funk <a24061@xxxxxxxxxxxxx>:

> On 2009-04-08, Matthias Andree wrote:
>
>> Leafnode-1 and -2 currently use roughly the same spool format:
>> Assuming an instact spool, each article has at least two links, one in  
>> the
>> message.id/NNN/ (*) directory, and one in the news/group/ directories  
>> (or
>> more if an article is cross-posted to multiple groups you're subscribed
>> to).
>>
>> texpire works in two phases. Phase 1 will look at when the threads in a
>> particular newsgroup were last read and unlink those links from the
>> news/group/ directories that are past expiry date for the group. After
>> that, in phase 2, it will traverse the message.id/ directories and  
>> unlink
>> all files that have just one link.
>>
>> Since the link count is unreliable with a world-readable newsspool:
>> leafnode-2 does not make these directories or articles world-readable  
>> and
>> continues to use the link count.
>>
>> Leafnode-1 was designed to offer a traditional (i. e. world-readable)
>> spool and cannot use the link count. Instead, it records the Message-IDs
>> of articles it kept during the 1st phase, creating up to 1,000 files  
>> named
>> message.id/NNN/mids - this is the "tracks the seen Message-IDs" part  
>> that
>> you quoted - and these "mids" files get reused in phase 2. The IDs  
>> listed
>> in these "mids" files are protected from expiry, the other files are
>> removed. This security fix is in place since 1.9.52 which was released 5
>> years and 5 days ago.
>
> I guess using the "mids" files is a lot slower than relying on the
> link count.  Thanks for the explanation.

It's indeed quite some more effort. It may not matter practically for  
smaller sites, but if you run leafnode on older hardware, it easily  
becomes noticable.

-- 
Matthias Andree
-- 
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