[jira] [Updated] (TS-4332) proxy.config.net.connections_throttle should allow for immediate error return when accepts reach throttle limit

["Leif Hedstrom (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/TS-4332?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Leif Hedstrom updated TS-4332:
------------------------------
    Fix Version/s: sometime

> 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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