Hi!
I have the impression that some not-so-easy SPARQL
queries that used to
run just below the timeout are now timing out regularly. Has there been
a change in the setup that may have caused this, or are we maybe seeing
increased query traffic [1]?
We've recently run on a single server for couple of days due to
reloading of the second one, so this may have made it a bit slower. But
that should be gone now, we're back to two. Other than that, not seeing
anything abnormal in
https://grafana.wikimedia.org/dashboard/db/wikidata-query-service
[1] The deadline for the Int. Semantic Web Conf. is
coming up, so it
might be that someone is running experiments on the system to get their
paper finished. It has been observed for other endpoints that traffic
increases at such times. This community sometimes is the greatest enemy
of its own technology ... (I recently had to IP-block an RDF crawler
from one of my sites after it had ignored robots.txt completely).
We don't have any blocks or throttle mechanisms right now. But if we see
somebody making serious negative impact on the service, we may have to
change that.
--
Stas Malyshev
smalyshev(a)wikimedia.org