Hi!
I found an important problem with the current
configuration,
that is likely a major factor in the performance loss we see.
I noticed that
https://query.wikidata.org/bigdata/ldf is served
on HTTPS, and even with HTTP/2.
However, the hypermedia controls inside of the message
direcs the server to the HTTP version of the URL:
Yes, I noticed that too, filed as:
https://phabricator.wikimedia.org/T153897
Unfortunately, we are now in deployment freeze, until January, so it's
hard to fix it immediately, as proper fix requires editing some configs
and deploying some patches, and it doesn't seem to be
production-breaking. But starting January 2 we have deployments again so
it'll be fixed.
But, it should not be that big of an issue since Wikimedia servers use
HSTS which means no actual http requests are performed in a modern
browser). So I don't think it slows things down that much.
--
Stas Malyshev
smalyshev(a)wikimedia.org