scaling collected_torrents

[Dmole]

> du -sc ~/.Tribler/collected_torrents 
973M	~/.Tribler/collected_torrents
> strings ~/.Tribler/collected_torrents/*.ldb | grep files | wc -l
19877

That is not going to scale well, I recommend only storing torrents for subscribed channels.
Or share the Max Disk space setting from token mining.

[devos50]

We recently fixed an issue where torrents were not collected at all, which explains why the size of this file is growing. IIRC, we had some code to remove old torrents from the leveldb store but I'm not sure what happened to that. Also, there used to be a configuration option to limit the total number of torrents in the store (this was 50.000 by default I think).

Storing only torrents for subscribed channels is a good idea. Another solution could be to only store popular torrents since they are more likely to be downloaded by the user. Maybe we could combine this with the popularity overlay that @xoriole made?

[Dmole]

Maybe 2 options;

• prioritize [recent, popular, subscribed]
• limit up to [X] MB

and a "clear cache" button

[Dmole]

rm -r .Tribler/collected_*

reduced the size from 1.2 GB to 7MB.

[Dmole]

.Tribler/collected_* should be moved to $Downloads with credit_mining.

[devos50]

Related to #1150

[Dmole]

#4199

[ichorid]

Fixed by #4090