On Wed, Oct 23, 2013 at 2:32 PM, Karsten Loesing kars...@torproject.orgwrote:
On 10/11/13 4:05 PM, Kostas Jakeliunas wrote:
Oops! Sorry for the delay in responding! Responding now.
On Fri, Oct 11, 2013 at 12:00 PM, Karsten Loesing
kars...@torproject.orgwrote:
Hi Kostas,
should we move this thread to tor-dev@?
Hi Karsten!
sure.
From our earlier conversation about your GSoC project:
In particular, we should discuss how to integrate your project into
Onionoo. I could imagine that we:
- create a database on the Onionoo machine;
- run your database importer cronjob right after the current Onionoo
cronjob;
- make your code produce statuses documents and store them on disk,
similar to details/weights/bandwidth documents;
- let the ResourceServlet use your database to return the
fingerprints to return documents for; and
- extend the ResourceServlet to support the new statuses documents.
Maybe I'm overlooking something and you have a better plan? In any
case, we should take the path that implies writing as little code as
possible to integrate your code in Onionoo.
Let me know what you think!
Sounds good. Responding to particular points:
- create a database on the Onionoo machine;
- run your database importer cronjob right after the current Onionoo
cronjob;
These should be no problem and make perfect sense. It's always best to
use
raw SQL table creation routines to make sure the database looks exactly
like the one on the dev machine I guess (cf. using SQLAlchemy
abstractions
to do that (I did that before)).
Current SQL script to do that is at [1]. I'll look over it. For example,
I'd (still) like to generate some plots showing the chances of two
fingerprints having the same substring (this is for the intermediate
fingerprint table.) (One axis would be substring length, another would be
the possibility in (portions of) %.) As of now, we still use
substr(fingerprint, 0, 12), and it is reflected in the schema.
Overall though, no particular snags here.
I don't follow. But before we get into details here, I must admit that
I was too optimistic about running your code on the current Onionoo
machine. I ran a few benchmark tests on it last week to compare it to
new hardware, and those tests almost made it fall over. We should not
even think about adding new load to the current machine.
New plan: can you run an Onionoo instance with your changes on a
different machine? (If you need anything from me, like a tarball of the
status/ and out/ directories, I'm happy to provide them to you.) I
think we should run this instance for a while to see how reliable it is.
And once we're confident enough, we'll likely have new hardware for the
new Onionoo, so that we can move it there.
This sounds like a very good idea. Ok, I can try and do this. Sorry for
delaying my response as well, I'll try and follow up with what I need (if
anything).
- make your code produce statuses documents and store them on disk,
similar to details/weights/bandwidth documents;
Right, so if we are planning to support all V3 network statuses for all
fingerprints, how are we to store all the status documents? The idea is
to
preprocess and serve static JSON documents, correct (as in the current
Onionoo)? (cf. the idea of simply caching documents: if we serve a
particular status document, it gets cached, and depending on the query
parameters (date range restriction, e.g.) it may be set not to expire at
all.)
Or should we try and actually store all the statuses (the condensed
status
document version [2], of course)?
Let's do it as the current Onionoo does it. This code does not exist,
right?
I've done some small testing on a local system, it seems the Onionoo way is
plausible, since the generation of all the old(er) status etc. documents
needs to happen only once (obviously, but now I understand this means the
number of resulting status documents and their size is not such a big deal
after all.) I don't have good code for it as of yet.
- let the ResourceServlet use your database to return the
fingerprints to return documents for; and
- extend the ResourceServlet to support the new statuses documents.
Sounds good. I assume you are very busy with other things as well, so
ideally maybe you had in mind that I could try and do the Java part? :)
Though, since you are much more familiar with (your own) code, you could
probably do it faster than me. Not sure.
Any particular technical issues/nuances here (re: ResourceServlet)?
Can you give it a try? Happy to help with specific questions about
ResourceServlet, and I'll try hard to reply faster this time. Again,
sorry for the delay!
Okay! I've been tinkering a bit, actually. Will see if I can produce
something decent and reliable.
Best wishes
Kostas.
[1]: https://github.com/wfn/torsearch/blob/master/db/db_create.sql
[2]:
