[BitTorrent] Tracker scrape extension proposal

Harold Feit - Depthstrike.com Administrator dwknight at depthstrike.com
Wed Jan 12 20:35:38 EST 2005

Hash: SHA1

Taking a look at the way get values are generated in cases of
multiple paramaters of the same key typically overwrites the value in
default configurations, preventing other values from being available.
Other configurations only read the first value, not allowing access
to those after it.

Clients that don't support asking for multiple scrapes in the same
request will only request 1 at a time, consistent with the way they
have done in the past.

For tracker-side development, I feel your suggestion of returning all
torrents when processing multiple info_hash values isn't supported is
quite damaging to the tracker (pointing back to your "thousands of
torrents" tracker example). If you requested the scrape data for 5
torrents and got 5000, you would be doing more damage to the tracker
than getting 5 separate requests.

- -----Original Message-----
From: Nick Johnson [mailto:arachnid at notdot.net] 
Sent: Wednesday, January 12, 2005 9:05 PM
To: BitTorrent at yahoogroups.com
Subject: Re: [BitTorrent] Tracker scrape extension proposal

On 13/01/2005, at 1:07 PM, Harold Feit - Depthstrike.com
> If you're scraping for 100 torrents, you may be better off just
> getting the full scrape anyway. As wrong as the behavior appears
> for multiple info_hash values, the way that it is handled is fairly
> consistent across different archtypes of trackers (although is more
> dependent on the archtypes of programming styles). Additional
> trackers will be supporting this in the near future.
This isn't such a good idea when the tracker has literally thousands
torrents, though. I'd really like to see an extension that has at
semi-official support, and for which the fallback behaviour when not 
supported is all torrents, rather than a single one. If you request 
multiple hashes, it makes no sense for a client not supporting the 
feature to return only a single one of them. :/

- -Nick Johnson

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