ASF GitHub Bot logged work on TS-4701:

                Author: ASF GitHub Bot
            Created on: 13/Oct/16 14:28
            Start Date: 13/Oct/16 14:28
    Worklog Time Spent: 10m 
      Work Description: Github user jrushford commented on the issue:

    [approve ci]

Issue Time Tracking

    Worklog Id:     (was: 30570)
    Time Spent: 2.5h  (was: 2h 20m)

> 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: 7.1.0, sometime
>          Time Spent: 2.5h
>  Remaining Estimate: 0h
> 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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