Hi Tatsuhiro, hi list,

Le 05.08.2010 à 17:05, Tatsuhiro Tsujikawa a écrit :
> Hi,
> 
> (08/05/10 11:55), Peter Pöml wrote:
>> Hi Tatsuhiro, hi *,
>> 
>> Am 21.07.2010 um 17:43 schrieb Peter Pöml:
>> 
>> 
>> I believe I have fixed the issue, and download.services.openoffice.org 
>> delivers the correct BitTorrent Information Hash now:
>> 
>> % curl -s 
>> http://download.services.openoffice.org/files/localized/ja/3.2.1/OOo_3.2.1_Win_x86_langpack_ja.exe.meta4
>>  | grep magnet
>>    <metaurl 
>> mediatype="torrent">magnet:?xt=urn:btih:78ebf160c1924d2ff098535bb0362172f467708c&amp;
>>  [...]
>> 
>> This is not the same hash as the one that torrent.projects.ooodev.org gives 
>> -- due to a difference in block size (262144 vs. 131072 bytes). Otherwise, 
>> it should fit. I tested with the smaller block size and verified that the 
>> hash would be identical in that case.
>> 
> 
> Thanks Peter.
> 
> I think this is a temporary issue until next mirror brain release, but I
> think btih info hash in magnet URI and info hash in tracker must be
> matched to make magnet URI work.
> Because magnet URI does not contain Metadata, BitTorrent client must
> retrieve it from other peers. It first contacts tracker with btih info
> hash. If btih info hash and infohash in tracker are different, tracker
> complains that it does not know that torrent and no peers are returned.
> When using current .meta4 file, all tracker returns failure message,
> which means magnet URI is not usable.

I see. Indeed, this is the case now.

I have made the chunk size in MirrorBrain configurable now, and I matched it to 
the chunk size that the torrent.projects.ooodev.org size uses. 

So now, the btih is the same.

On a related note, since none of the used trackers currently allows 
unregistered access, I have set up an experimental tracker on my own 
(bt.mirrorbrain.org:8091) which allows it. For now, that's the only tracker 
sent along with torrents delivered by download.services.openoffice.org. Hence, 
the torrents should actually be usable now. I could successfully download 
various files a number of times today, when experimenting.

Thanks a lot for your feedback,
Peter 
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