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https://issues.apache.org/jira/browse/TS-2522?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13919125#comment-13919125
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ASF subversion and git services commented on TS-2522:
-----------------------------------------------------

Commit 31792d2aae9519e0feb66ab9e80b1a9d5d51d7de in trafficserver's branch 
refs/heads/master from [~zwoop]
[ https://git-wip-us.apache.org/repos/asf?p=trafficserver.git;h=31792d2 ]

TS-2522 Better hook management, and cleanup

This also does

     - Add support for system wide config directory as default
     - Better debug messages (textual hook names etc.)
     - Less overhead on creating TXN hooks


> Rewrite header_rewrite hook management
> --------------------------------------
>
>                 Key: TS-2522
>                 URL: https://issues.apache.org/jira/browse/TS-2522
>             Project: Traffic Server
>          Issue Type: Improvement
>          Components: Plugins
>            Reporter: Leif Hedstrom
>            Assignee: Leif Hedstrom
>             Fix For: 5.0.0
>
>
> Right now, we use a transaction slot to pass information from "remap" state 
> over to one of the normal hooks. Because of the way this plugin works, I 
> think this can be optimized away. What we should do is to have one "global" 
> continuation for each remap rule, and schedule it from the remap plugin.
> This avoids having all the global hooks checking the transaction state (slot) 
> every time. It's also very cheap to schedule a transaction hook, it's O(1) 
> simply appending it to a linked list of hooks. If the hook doesn't get 
> invoked, it's mostly a no-op.
> Finally, this avoids consuming one of the limited transaction hooks, and at 
> the same time reduces overhead by only executing hooks when necessary.



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