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From "Chou, Peter" <>
Subject RE: Write Lock
Date Thu, 25 Jan 2018 17:41:49 GMT

Thanks for the response. Jeremy and I were looking for a way to cache an object that would
have been blocked by the cache_promote plugin (which uses the API function you show below).
We are considering adding an over-ride into this plugin, e.g., special ATS internal header,
that could be set by other plugins to  allow an object to be cached earlier than the normal
cache_promote policy. This would probably be better than messing around with the write-lock.
Appreciate any thoughts.


From: Aaron Canary []
Sent: Thursday, January 25, 2018 6:56 AM
Subject: Re: Write Lock

This is how I disable writing to cache from a plugin. I'm not sure that is exactly what you
are asking for.
I've used it as late as TS_HTTP_READ_RESPONSE_HDR_HOOK. But it will also work in a TS_HTTP_CACHE_LOOKUP_COMPLETE_HOOK.

    // do NOT write to cache
    TSHttpTxnServerRespNoStoreSet(txnp, 1);

On Wed, Jan 24, 2018 at 3:18 PM, Jeremy Payne <<>>
Is there an over-rideable configuration or maybe an API function I can
use to disable write locks for
a given cache-key/txn ?

Basically after the cache lookup is complete, I want to parse request
headers and if header values match a certain string/condition, I want
to disable the
write lock.  I'm OK if this disables caching for the transaction.


Aaron Canary
ATS - Senior Software Engineer
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