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https://issues.apache.org/jira/browse/TC-391?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16128683#comment-16128683
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Ryan Durfey commented on TC-391:
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After a lot of research this is more likely on the ATS side. This ticket is
being closed.
> Mid Tier Thundering Herd Overwhelms Origin when Origin Slow to Respond
> ----------------------------------------------------------------------
>
> Key: TC-391
> URL: https://issues.apache.org/jira/browse/TC-391
> Project: Traffic Control
> Issue Type: Bug
> Components: Traffic Ops
> Reporter: Ryan Durfey
> Labels: origin, thundering_herd
>
> Mid tier groups typically send one request per object to origin. We have
> noticed that when an origin is slow to respond or sends errors that the mid
> tier sometimes sends many requests at a high TPS rate which causes a slow
> origin to fail.
> We are investigating this on both the ATS and ATC side. We are considering
> tuning the mid tier retry attempts as well as some other configuration
> settings to reduce the potential for overload.
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