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Maniphest T168926

MessageGroupStats caused database query issues
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Description

There seems to be database contention between 16:10 and midnight UTC on the 26th of june:

https://logstash.wikimedia.org/goto/3bcfe493d8d19739bca928d1b413d4e9

Several MessageGroupStats-related errors (such as Wikimedia\Rdbms\DatabaseMysqlBase::lock failed to acquire lock 'MessageGroupStats:updates' seems to be happening on meta and mediawiki.org at that time. While in commonly used database rows that would point to an overload, on less commonly used functions, that would normally point to a bug.

Potentially related to T53410

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Event Timeline

jcrespo created this task.Jun 27 2017, 7:39 AM
Restricted Application added a subscriber: Aklapper. · View Herald TranscriptJun 27 2017, 7:39 AM
• Nikerabbit subscribed.Jun 27 2017, 10:07 AM

55 in mediawiki.org from /rpc/RunJobs.php?wiki=mediawikiwiki&type=TranslationsUpdateJob&maxtime=30&maxmem=300M
~4k in metawiki from /rpc/RunJobs.php?wiki=metawiki&type=MessageGroupStatesUpdaterJob&maxtime=60&maxmem=300M
~14k in metawiki from /w/api.php
~100 in metawiki from /wiki/Learning_and_Evaluation/...

Sounds like these were caused by large translatable page moves, perhaps related to T168591: Complex page move leaves some translation-related pages behind.

Nemo_bis subscribed.Jun 29 2017, 10:40 AM
AndyRussG mentioned this in T170591: WMDE banners failing to save - Timing out on save.Jul 14 2017, 7:44 PM
AndyRussG mentioned this in T170968: Translate: Large number of rows affected when rebuilding message index, causing DB timeouts.Jul 18 2017, 6:41 PM
Krinkle closed this task as Declined.Jul 25 2018, 7:39 PM
Krinkle subscribed.

Zero hits in Logstash in at least 30 days for either of "failed to acquire lock" or "TranslationsUpdateJob".

• mmodell changed the subtype of this task from "Task" to "Production Error".Aug 28 2019, 11:10 PM
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