Downtime is over - WCQS beta service has been restored from the latest (available on Monday) dump. Unfortunately, due to the issue with skolemization for SDC dataset, using skolemized blank nodes change was reverted - we will be working on figuring out what's the problem.

Have a good day,

Zbyszko

On Mon, Jun 7, 2021 at 10:04 AM Zbyszko Papierski <zpapierski@wikimedia.org> wrote:

Hi all,

We are using this downtime to introduce blank node skolemization to WCQS Beta[1]. This change is a prerequisite on our future work on real time updates for that service.

[1] https://www.mediawiki.org/wiki/Wikidata_Query_Service/Blank_Node_Skolemization

On Mon, Jun 7, 2021 at 9:54 AM Zbyszko Papierski <zpapierski@wikimedia.org> wrote:

Hi all,

Due to  low disk space on the WCQS beta instance and possible data corruption that might've happened because of it, we need to take down WCQS beta and rebuild its journal - operation should take about 2 days - starting now. I'm sorry for any inconvenience this may cause.

This is a recurring issue, but we have a permanent solution in the pipeline on which we plan to start working on soon: [1].

[1] https://phabricator.wikimedia.org/T262265

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Zbyszko Papierski (He/Him) Senior Software Engineer Wikimedia Foundation

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Zbyszko Papierski (He/Him) Senior Software Engineer Wikimedia Foundation

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Zbyszko Papierski (He/Him) Senior Software Engineer Wikimedia Foundation