Eric, 
 It is modifying the table schema’s default it will not change existing values.

On 12/4/17, 1:22 PM, "Eric Friedrich (efriedri)" <[email protected]> wrote:

    It looks like this will modify existing values as well (so its not really a 
default)?
    
    > On Dec 4, 2017, at 3:03 PM, Durfey, Ryan <[email protected]> wrote:
    > 
    > With the capacity of our servers being in the 18 Gbps range I would say 
max dns answers should be between 2-4 unless volumes expected are > 250 Gbps.  
I think 2 or 3 would be a good starting point for most services.
    > 
    > Ryan Durfey    M | 303-524-5099
    > CDN Support (24x7): 866-405-2993 or 
[email protected]<mailto:[email protected]>
    > 
    > 
    > From: Dylan Volz <[email protected]>
    > Reply-To: "[email protected]" 
<[email protected]>
    > Date: Monday, December 4, 2017 at 12:58 PM
    > To: "[email protected]" 
<[email protected]>
    > Subject: Changing max_dns_answers default
    > 
    > Hi All,
    > 
    > The max_dns_answers has been defaulted to 0, which is an unlimited number 
of answers, which causes issues for deployments with large cache groups. I 
opened a PR 
(1611<https://github.com/apache/incubator-trafficcontrol/pull/1611><https://github.com/apache/incubator-trafficcontrol/pull/1611%3e>)
 to change the default from 0 to 5 which is hopefully a sensible value for most 
deployments. If this doesn’t seem like a sensible default please respond with 
alternatives.
    > 
    > Thanks,
    > Dylan
    > 
    
    

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