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https://issues.apache.org/jira/browse/TS-4707?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15504833#comment-15504833
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Gancho Tenev commented on TS-4707:
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[~jrushford], [~pbchou], [~zwoop], 

I am not sure if I studied this enough but here is an idea: it seems that we 
could add a switch to {{cachekey}} plugin to make it use the "modify parent 
selection URI" API call instead of "modify cache key URI" API if something 
like: {{\@plugin=cachekey \@pparam=--parent_selection}} is used.

This way we may be able to use independently different {{cachekey}} plugin 
instances per each remap rule (one for modifying the cache key URI and one for 
modifying the parent selection URI) to be able to cover for more use-cases, 
reuse the {{cachekey}} URI manipulation functionality and have consistent user 
experience. If this makes sense/works we may end up renaming the plugin to 
something more generic.

Currently {{cachekey}} plugin has the ability to do {{fname}} and {{maxdirs}} 
features by using some of its regex related features (please see 
{{--capture-path=/capture/replace/}} @  [cachekey 
docs|https://docs.trafficserver.apache.org/en/latest/admin-guide/plugins/cachekey.en.html#path-section],
 I can provide examples if requested)

I think {{fname}} would not make sense for manipulating the cache key URI and 
if we insist on non-regex ways to achieve {{fname}} and {{maxdirs}} we could 
add it as features available only if {{--parent_selection}} is used, or 
something in this sense.

If this sounds sensible/feasible I can work on the {{cachekey}} plugin change.

> Parent Consistent Hash Selection - add fname and maxdirs options.
> -----------------------------------------------------------------
>
>                 Key: TS-4707
>                 URL: https://issues.apache.org/jira/browse/TS-4707
>             Project: Traffic Server
>          Issue Type: Improvement
>          Components: Parent Proxy
>            Reporter: Peter Chou
>            Assignee: Peter Chou
>             Fix For: 7.1.0
>
>          Time Spent: 11.5h
>  Remaining Estimate: 0h
>
> This enhancement adds two options, "fname" and "maxdirs", which can be used 
> to exclude the file-name and some of the directories in the path. The 
> remaining portions of the path are then used as part of the hash computation 
> for selecting among multiple parent caches.
> For our usage, it was desirable from an operational perspective to direct all 
> components of particular sub-tree to a single parent cache (to simplify 
> trouble-shooting, pre-loading, etc.). This can be achieved by excluding the 
> query-string, file-name, and right-most portions of the path from the hash 
> computation.



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