elsloo commented on issue #7988:
URL: https://github.com/apache/trafficserver/issues/7988#issuecomment-867741165


   Note: HostDB does have the parameter `proxy.config.hostdb.fail.timeout` 
which provides some semblance of negative caching. This might suffice for most 
use cases.
   
   That said, in an ideal world, this setting would follow the ncache TTL in 
the SOA record instead of using a static value such that HostDB honors what the 
domain administrator has configured for a given domain. Perhaps we allow one to 
specify whether we use a static value or honor the value in the SOA, and, even 
better if such a parameter is overridable and reloadable.


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