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https://issues.apache.org/jira/browse/TS-4701?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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John Rushford updated TS-4701:
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Summary: Add a new latched parent selection strategy. (was: Add a new
parent selection strategy.)
> Add a new latched parent selection strategy.
> --------------------------------------------
>
> Key: TS-4701
> URL: https://issues.apache.org/jira/browse/TS-4701
> Project: Traffic Server
> Issue Type: New Feature
> Components: Parent Proxy
> Reporter: John Rushford
> Assignee: John Rushford
> Fix For: sometime
>
>
> For live linear video we are utilizing parent selection to round robin to
> origin servers in the event of a origin server failure, parent_is_proxy=false
> and round_robin=false. With this round robin strategy, the first parent in
> the parent.config list is always selected. In the event of a connection
> failure, a new parent is selected from the list. This works fine except that
> switching to a new parent is expensive, in that the client has to retune
> because the abr manifests between origins are different. A single retune can
> be tolerated but, after the parent retry time has elapsed, the round robin
> strategy will revert back to the original parent when it becomes available.
> This causes a second retune. In order to minimize client retuning, I'd like
> to add a new round robin strategy that is similar to round_robin=false but
> the new strategy would stay "latched" to the selected parent and remain
> "latched" until such time that a connection failure warrants using a new
> parent. I propose calling this strategy "latched" as in an electronic latch
> that becomes fixed in a particular state when triggered. This strategy would
> be a minor modification to ParentRoundRobin and ParentSelection.
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