Same rank trackers should all be announced

[TooCh0za]

If I understand correctly the multi-tracker feature, deluge stops running through the tracker list after the first successful announce.

Please enable deluge to announce on several different trackers at the same time, so that the trackers sharing the same rank are all announced.

This is necessary if sharing data on two private trackers with no DHT.

[Thump]

I don't think that this is for 1.3.2.

Deluge uses libtorrent-rasterbar-0.14 out of the box and this feature presents only in libtorrent-rasterbar-0.15.

Also, authors of Deluge against of this feature because it's breaking the standards, as µTorrent, however µTorrent is an official client for BitTorrent right now and this is strange.

Latest topic on forum about this feature is: ​http://forum.deluge-torrent.org/viewtopic.php?f=8&t=23275

[funnel]

​MPW seconded adding preferences for this because "often one tracker has no peers, and others do." Cas pointed out the session settings available in libtorrent 0.15 for multi tracker torrents:

• announce_to_all_trackers
• announce_to_all_tiers

"It may not be set as default in Deluge, but the option could be made available in preferences." Please remember to change the functionality of the Edit Trackers window (right-click on a torrent) to:

• Recognize tiers when adding trackers
• Edit tiers after adding trackers

uTorrent recognizes separate tiers by looking for an empty line between groups of trackers in the list the user provides. Transmission, ​it seems, automatically organizes trackers into tiers by parsing their URL's.

This might be better in a follow-up ticket, but it would be nice to see the amount of peers/seeds on each tracker so users can decide whether to remove those with 0 peers/seeds.

[Calum]

There is already an edit tiers option in the edit trackers dialog.

[funnel]

The Up/Down buttons allow editing tiers (my mistake).

The Add button, however, places each tracker into its own tier regardless of empty lines or URL domains. I suppose if there is no intention to recognize tiers when adding, then that bullet is irrelevant. Although, that means users desiring optimal performance must organize tiers manually every time trackers are added, even if the trackers were already organized with empty lines. It's clunky, but you're right: it technically works already.

[Calum]

You can use the ​lt config plugin to change this setting in meantime.

[Pavle Dukanac]

in libtorrent-0.15 and later, you can set session_settings::announce_to_all_tiers to true.

This violates the multi-tracker specification but makes libtorrent behave like uTorrent in this regard.

infor from: ​http://sourceforge.net/p/libtorrent/mailman/message/24068667/ by Arvid Norberg

I believe we should do what Arvid said since default behaviour is not what what user expect from using torrent with multiple trackers in it ( speed )

[Calum]

Milestone renamed

[Calum]

There is a helpful implementation in ​PR 319 but I want to gain some clarity on this topic since the PR is attempting to enable announce_to_all_trackers which matches the description of announcing to all trackers within a tier.

However I do not think this is correct setting to use since tiers are meant to be load-balanced and runs the risk of client being banned if announcing to every tracker in a tier.

I think the sane approach is to use announce_to_all_tiers that mimics the existing uT spec.

Relevant reading

libtorrent documentation

• ​http://libtorrent.org/single-page-ref.html

  announce_to_all_trackers controls how multi tracker torrents are treated. If this is set to true, all trackers in the same tier are announced to in parallel. If all trackers in tier 0 fails, all trackers in tier 1 are announced as well. If it's set to false, the behavior is as defined by the multi tracker specification.

  announce_to_all_tiers also controls how multi tracker torrents are treated. When this is set to true, one tracker from each tier is announced to. This is the uTorrent behavior. To be compliant with the Multi-tracker specification, set it to false.

Transmission client discussion

• ​https://trac.transmissionbt.com/ticket/1699
• ​https://trac.transmissionbt.com/attachment/ticket/1699/dwk-lord-mmn-log.txt

  each tier should be assumed to operate as a single tracker and assumed to communicate amongst themselves as far as peerlists are concerned the "backup" tiers are separate trackers that have no knowledge of the peers on the primary or other tiers

BitTorrent spec discussion

• ​https://github.com/bittorrent/bittorrent.org/issues/82

  I believe opentracker does data replication via multicast between multiple nodes that ought to be published within the same tier. So treating a single tier as load-balancing frontends would be correct in that case.

• ​https://www.bittorrent.org/beps/bep_0012.html