Wierd piece behavior?

[Nefarious]

I was just downlaoding a single file torrent and i noticed this behavior on it:

is it possible that some client is prioritizing the las pieces of the torrent? i didnt know of any client that could do that, at least not that way

or is it just a coincidence...

it is a 4GB file, so seems all the prioritized is like 1 GB, too much for a coincidence i think

[Ezra]

Maybe you have prioritize first and last pieces enabled?

[Ultima]

That's irrelevant in this case, as downloading first and last pieces do not affect it to that extent. IMHO, it's entirely coincidence.

[torrero]

I was seeding two torrents with just one mp3 file each. The torrents were both 3 month seeded, so there were only a few peers. A guy with libtorrent jumped on both torrents and its download behaviour was like OP explained. So chances are its a libtorrent client.

[Nefarious]

just to be safe i'm gonna make a re-check, let it not be a wasted download

edit: nope, still like that, libtorrent then... hmmm will take a look at it

[Harry Poppins]

I'm not sure I get what's going on here, if those solid blocks were in the availability bar, it would mean that the swarm has more copies of those particular files/pieces than the rest (right?). But they're in the "downloaded" bar, meaning that your client downloaded them first, probably because you prioritized those files (is that the case?). If I interpret those bars correctly, then the availability seems to be pretty evenly distributed, so there's no reason for your client to download those particular files first, unless you prioritized them, or by some freakish convergence of factors that my tiny mind fails to grasp.

[Ultima]

It's a 1 file torrent, which is the semi-odd part. It'd make some sense if there were a bunch of small files, and you prioritize first and last pieces, but since that's not the case...

[Harry Poppins]

Oh sorry, I should have ready more carefully. That does look weird...

[Ultima]

lol don't worry about that, I made that same exact mistake in reading the first post the first time around... ICleolion had to correct me :<

[Alpha-Toxic]

I think this is "allways prio rare" at work here. There are lots of clients that tend to prio the beginning of the torrent, either if u tell them to (like BC) or automagicaly (like KTorrent). If u ask me, the end of the availability bar does look whiter, the difference might have been even bigger earlier. So uT is prioritizing the rare pieces and u have what u see. And what I think is a proof to that is the single piece at the right side with a bit higher availability that uT hasn't dl-ed.

[Ultima]

Prioritizing rare pieces wouldn't have that great an effect as to make the piece distribution extremely consolidated and dense there, though. I still say it's a coincidence (along the lines of what has been suggested -- outside interference and/or stupid clients screwing around).

[Nefarious]

i get stupid clients for 50 points

[Switeck]

There may be a sort of "light" super-seeding/initial seeding mode in libtorrent which basically only uploads the upper half or lower half of a torrent. This would only be of value in very slightly reducing piece reequests and piece list exchanges between peers and seeds.