[SAC] [OSGeo] #1693: Slow DNS lookups on tracsvn

[OSGeo]

#1693: Slow DNS lookups on tracsvn
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 Reporter:  strk           |      Owner:  sac@…
     Type:  task           |     Status:  new
 Priority:  normal         |  Milestone:
Component:  Systems Admin  |   Keywords:  tracsvn, dns
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 I've just updated the Gogs implementation to cache DNS lookups because
 otherwise it would take up to 14 seconds to render the user-explore page,
 due to having to lookup the domain of each user's email in the page (~20
 per page).

 Now, with the cached lookups the time to render the page goes down from 14
 second to 5 _milli_ seconds.

 This tells me there's an issue with the DNS resolution.
 I don't know which other services do use DNS lookups, but if any
 production service does it too (beside Gogs which is only experimental)
 we'd better install a local caching server, like dnsmasq (or, as I've been
 suggested, "unbound").

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Ticket URL: <https://trac.osgeo.org/osgeo/ticket/1693>
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