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"Lock wait timeout exceeded" errors in logstash, aparently related to related to MessageUpdateJob or MessageGroupStats::clear
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Description

Within the last 24 hours, there are ~450 errors matching the phrase "Lock wait timeout exceeded" in logstash. Basically all of them seem to be related to MessageUpdateJob or MessageGroupStats::clear. It is possible that these cause 503 spikes for unrelated requests, so it's worth investigating the source of this lock timeout.