[metrics-team] Onionoo architecture

[Karsten Loesing]

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On 14/07/16 20:22, Anathema wrote:
> As already said in the meeting today, I'd like to know the
> architecture underline the Onionoo service: which
> webserver/caching/db/$tech is used?

Here's what happens to a request coming in to
https://onionoo.torproject.org/:

 - Varnish checks whether it has served the same request before and
still has a recent enough copy.  If not, it forwards to:

 - Jetty, which has a single servlet and an in-memory index of
anything that can be contained in query parameters.  That servlet
compiles a list of relay and bridge fingerprints for the response.
Actual response contents are located in the:

 - file system, which contains one file per document type and fingerprint.

> What are the internal details? Do you have any benchmark data like 
> CPU/RAM loads?

I'm afraid I don't have anything else than what I said in today's meeting.

Hope that helps!

> Thanks, Regards

All the best,
Karsten

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