[GitHub] [trafficserver] mlibbey commented on issue #8672: What's the point of ttl-in-cache ?

[GitBox <gi...@apache.org>]

mlibbey commented on issue #8672:
URL: https://github.com/apache/trafficserver/issues/8672#issuecomment-1043685773


   The RAM cache is tightly related to the disk cache. The way I think of it is that a disk object gets popular enough to be nominated to be represented in ram -- if its not on disk it can't be in ram cache.
   
   FWIW(eg, not answering your question), we don't use cache.config. Instead, we use header_rewrite plugin to add/set Cache Control on a per remap basis -- like 
   
   ```
   # ignore the origin CC, just use ours
   cond %{READ_RESPONSE_HDR_HOOK} [AND]
   cond %{HEADER:Cache-Control} ="" [AND]
   cond %{STATUS} >199 [AND]
   cond %{STATUS} <400
       set-header Cache-Control "max-age=300, public"
   ```
   or 
   ```
   # use origin CC if present, otherwise use ours
   cond %{READ_RESPONSE_HDR_HOOK} [AND]
   cond %{HEADER:Cache-Control} ="" [AND]
   cond %{STATUS} >199 [AND]
   cond %{STATUS} <400
       set-header Cache-Control "max-age=21600, public"
   ```
   
   Also not answering your question... think a few orgs have found LRU to be more performant for ram cache than CLFUS.
   


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