Hi!

This morning we have switched the polling mechanism for Wikidata Query
Service from using Recent Changes API to using Kafka events
(https://wikitech.wikimedia.org/wiki/EventBus). This should improve
reliability of the updates and reduce load on Wikidata servers. Given
that we are putting more data into Wikidata and more servers for SPARQL
services, having a scalable update mechanism is important, and that's
what we are doing with Kafka updater.

If everything works well, you should not notice any change at all.

So far, we have inspected it in action for a few days and it seems to be
working fine. However, since the functionality is new, it is possible
that some bugs exist. The bugs might manifest themselves in certain new
edits not being reflected in Wikidata Query Service data. If you notice
this happening, please tell me (preferably via Phabricator ticket
specifying the details of the problem, but if it doesn't work for you
you can email me or ping me on IRC or on Wiki: Smalyshev_(WMF)).

Thanks,
-- 
Stas Malyshev
smalys...@wikimedia.org

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