Leif Hedstrom created TS-2522:
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Summary: 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
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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