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Maniphest T278734

mw1304: Memcached error for key X on server 127.0.0.1:11213: A TIMEOUT OCCURRED
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Description

Since roughly 3:40 am UTC, mw1304 emits TIMEOUT OCCURRED memcached errors at a rate of roughly 400 events per minute.

https://logstash.wikimedia.org/goto/925eb928dffdd7727e80eb95415feb76

mw1304_memcached.png (458×945 px, 63 KB)

Event Timeline

hashar created this task.Mar 30 2021, 7:31 AM
Restricted Application added a subscriber: Aklapper. · View Herald TranscriptMar 30 2021, 7:31 AM
hashar added a comment.Mar 30 2021, 7:32 AM

It also does not show up in https://grafana.wikimedia.org/d/000000377/host-overview so maybe the host is broken somehow.

Stashbot added a comment.Mar 30 2021, 7:37 AM

Mentioned in SAL (#wikimedia-operations) [2021-03-30T07:37:21Z] <elukey> restart-php7.2-fpm on mw1304, jobrunner completely overwhelmed by ffmpeg/transcode jobs (not publishing metrics, erroring out for memcached timeouts) - T278734

hashar added a comment.Mar 30 2021, 7:41 AM

The timeout errors have vanished. No idea why the job runner would over run video transcoding on a given host though.

hashar closed this task as Resolved.Mar 30 2021, 12:45 PM
hashar assigned this task to elukey.

Root cause is not addressed but flushing the stuck php transcode jobs has made the server responsive again.

hashar added a comment.Mar 30 2021, 4:48 PM

The same issue happened later which is now tracked in an incident document.

RhinosF1 subscribed.Mar 30 2021, 4:53 PM
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