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https://issues.apache.org/jira/browse/TS-2536?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13883448#comment-13883448
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Leif Hedstrom commented on TS-2536:
-----------------------------------
TS-2501 implements some improvements to short cut the (many) cases where the
variable expansion is unecessary. But I feel there's room for future
improvements here, so filing this.
> Performance improvements to VariableExpander in header_rewrite
> --------------------------------------------------------------
>
> Key: TS-2536
> URL: https://issues.apache.org/jira/browse/TS-2536
> Project: Traffic Server
> Issue Type: Bug
> Components: Plugins
> Reporter: Leif Hedstrom
> Fix For: sometime
>
>
> It seems that VariableExpander gets instantiated and executed on every
> add-header operator. However, this seems rather suboptimal for a number of
> reasons:
> 1. It might not even be necessary (i.e. there might not be any %<> strings in
> the "static" string.
> 2. Perhaps even more important, we look for these strings on every request,
> even though if they are there, they would always be in the same position on
> every request.
> One suggestion would be to incorporate the VariableExpander "state" as part
> of parsing the configuration on startup / reload. Maybe it gets complicated
> when there are other expansions, but it still feels we can pre-parse these
> strings and get some ideas of what needs to be expanded once, and not on
> every request.
> This is similar to how e.g. the regex_remap plugin works, it recalculates the
> positions and expansion once only.
> Thoughts?
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