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https://issues.apache.org/jira/browse/TS-3505?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Leif Hedstrom closed TS-3505.
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> New plugin: cache promotion policies
> ------------------------------------
>
> Key: TS-3505
> URL: https://issues.apache.org/jira/browse/TS-3505
> Project: Traffic Server
> Issue Type: New Feature
> Components: Plugins
> Reporter: Leif Hedstrom
> Assignee: Leif Hedstrom
> Labels: A
> Fix For: 6.0.0
>
>
> This plugin will let you decide at cache write time if you really want to
> allow the object to get into cache or not. Once in cache, it'll of course
> continue to be served out of cache. The typical use case here is for a small
> cache, where the tail-end content is huge. Instead of churning the disks, we
> only allow to write objects to cache if they are "popular" enough.
> The first implementation only implements a very simple statistical policy,
> ChancePolicy() which takes a percentage argument. So, you give it a
> percentage, say 5%, which means there's a 5% chance that the response gets
> written to cache. 95% of the time the requests will go to origin instead.
> Caveat: There's an unfortunate problem with the APIs I was hoping to use, so
> right now it can only make the decision to write to cache or not in the
> TS_HTTP_READ_RESPONSE_HDR_HOOK hook using TSHttpTxnServerRespNoStoreSet(txnp,
> 1);
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