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dnsdist: Keep the TCP connection open on cache hit, generated answers #6012

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merged 1 commit into from Dec 5, 2017

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rgacogne commented Nov 28, 2017

Short description

We used to close the TCP connection right away on cases where that did not make sense:

  • on a cache hit
  • on a self-generated answer
  • on a servfail answer caused by the lack of usable downstream servers

We still close the TCP connections on drops, dynamic blocks, lack of usable downstream servers without setServFailWhenNoServer() set, invalid queries, network errors..

Checklist

I have:

  • read the CONTRIBUTING.md document
  • compiled and tested this code
  • included documentation (including possible behaviour changes)
  • documented the code
  • added or modified regression test(s)
  • added or modified unit test(s)
dnsdist: Keep the TCP connection open on cache hit, generated answers
We used to close the TCP connection right away on cases where that did
not make sense:
- on a cache hit
- on a self-generated answer
- on a servfail answer caused by the lack of usable downstream servers

We still close the TCP connections on drops, dynamic blocks, lack of
usable downstream servers without `setServFailWhenNoServer()` set,
invalid queries, network errors..

@rgacogne rgacogne added this to the dnsdist-1.3.0 milestone Nov 28, 2017

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zeha commented Nov 28, 2017

LGTM

@rgacogne rgacogne merged commit 0ebca61 into PowerDNS:master Dec 5, 2017

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@rgacogne rgacogne deleted the rgacogne:dnsdist-tcp-ka branch Dec 5, 2017

rgacogne added a commit to rgacogne/pdns that referenced this pull request Feb 13, 2018

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