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From Jeremy Payne <jp557...@gmail.com>
Subject Re: child always re-validates object fetched from parent
Date Mon, 08 Jan 2018 16:29:00 GMT
Can you modify the below to reflect non-zero values ?

##############################################################################
# Heuristic cache expiration. Docs:
# https://docs.trafficserver.apache.org/records.config#heuristic-expiration
##############################################################################
# Setting all of these to zero in order for everything to be considered stale
# by ATS. If we want to change this in the future, this is where to do it.
CONFIG proxy.config.http.cache.heuristic_min_lifetime INT 0
CONFIG proxy.config.http.cache.heuristic_max_lifetime INT 0
CONFIG proxy.config.http.cache.heuristic_lm_factor FLOAT 0.000000
##############################################################################

On Mon, Jan 8, 2018 at 10:24 AM, Patrick O'Brien
<patrickobrien@tetrisblocks.net> wrote:
> Hey Jeremy,
>
> Here's the full config from the child node:
> https://gist.github.com/poblahblahblah/a1abdad3d64ebdfba003c75e50c9fe00
>
> Thanks for looking!
>
> On Sun, Jan 7, 2018 at 8:13 PM, Jeremy Payne <jp557198@gmail.com> wrote:
>> Can you post the complete records.config from your child cache ?
>> If I had to guess, it looks like heurstics or fuzzytimer may be set too low ???
>> But if you provide  a company sanitized version of your records.config
>> that should give us a better understanding of your setup.
>>
>>
>>
>>
>>
>>
>> On Wed, Jan 3, 2018 at 6:10 PM, Patrick O'Brien
>> <patrickobrien@tetrisblocks.net> wrote:
>>> Hello,
>>>
>>> I am testing out hierarchical caching in ATS 7.1.1. Everything seems
>>> to work, although it looks like the child node is always needing to
>>> revalidate objects fetched from the parent node. Here are the headers
>>> on an example GET:
>>> https://gist.github.com/poblahblahblah/928aaa88c24ef3c05366433a514f1a28
>>>
>>> The parent has the object stored in RAM and doesn't require
>>> validation, but the child thinks the response is stale. Here is the
>>> cache.config file on both the parent and the child:
>>> https://gist.github.com/poblahblahblah/36b54ac8b7d75071c1342da6694d3c51
>>>
>>> The problem with this is that the connection between the child and
>>> parent is pretty flaky and when the parent is down we are met with a
>>> 502: https://gist.github.com/poblahblahblah/d50657354c815040faae50539fa45836
>>>
>>> Here is the parent.config on the child:
>>> https://gist.github.com/poblahblahblah/9f1dcb4cf674c21c80a27173bd0ef81b
>>>
>>> Relevant configs from records.config for the parent:
>>> https://gist.github.com/poblahblahblah/e6ac573e9f9cd63088c2e06e6544d801
>>> Relevant configs from records.config for the child:
>>> https://gist.github.com/poblahblahblah/5a6dc02a88b24cafca0e8c70d353b92e
>>>
>>> Any guidance on this would be much appreciated.
>>>
>>> -patrick

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