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https://issues.apache.org/jira/browse/TS-4332?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15360535#comment-15360535
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ASF GitHub Bot commented on TS-4332:
------------------------------------
Github user atsci commented on the issue:
https://github.com/apache/trafficserver/pull/761
FreeBSD build *successful*! See
https://ci.trafficserver.apache.org/job/Github-FreeBSD/409/ for details.
> proxy.config.net.connections_throttle should allow for immediate error return
> when accepts reach throttle limit
> ---------------------------------------------------------------------------------------------------------------
>
> Key: TS-4332
> URL: https://issues.apache.org/jira/browse/TS-4332
> Project: Traffic Server
> Issue Type: Bug
> Components: Network
> Reporter: Susan Hinrichs
> Assignee: Susan Hinrichs
> Fix For: sometime
>
>
> When the throttling kicks in future connections to origins will cause a 502
> to be returned to the user agent.
> But when an accept happens during the throttling period, a message is only
> sent if the unix_netProcessor.throttle_error_message member variable is set.
> In the current code, this member variable is never set. If the variable is
> not set, the logic blocks for 100ms and tries again.
> This spinning causes the ATS process to waste resources. It would be better
> to immediately turn around and send an error response (probably 503 instead
> of 502).
> I tested a build that hard coded an error message and it seemed to recover
> much better.
> I propose adding some config variables to control the throttling behavior.
> proxy.config.connections_throttle.error_code - HTTP response code to return
> (or just hard code this to 503)
> proxy.config.connections_throttle.error_page - Reference to an error page to
> return.
> If both are unset, the existing delaying logic is used. If either is set,
> either a error header or a header and body are returned immediately.
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