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https://issues.apache.org/jira/browse/TS-3118?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14333641#comment-14333641
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James Peach commented on TS-3118:
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There's already a mechanism to automatically delay a restart until the number
of client sessions drops below a configured threshold. It would not be that
hard to extend this to stop accepting new connections. However, typically there
is a layer above that is draining connections (ie. some balancing
infrastructure), so implementing this behavior would imply serving errors to
clients, which is probably not desirable.
If we published the "shutting down" state as a metric, then it would be
possible to write a plugin to take appropriate action. Options could be serving
the request, dropping the client, serving a HTTP redirect, etc.
> Feature to stop accepting new connections
> -----------------------------------------
>
> Key: TS-3118
> URL: https://issues.apache.org/jira/browse/TS-3118
> Project: Traffic Server
> Issue Type: New Feature
> Reporter: Miles Libbey
> Labels: A
> Fix For: 5.3.0
>
>
> When taking an ATS machine out of production, it would be nice to have ATS
> stop accepting new connections without affecting the existing client
> connections to minimize client disruption.
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