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https://issues.apache.org/jira/browse/TS-3750?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14623195#comment-14623195
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Adam W. Dace commented on TS-3750:
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Kinda bored, so I'm attempting to dig into this further.
For some reason, this only occurs during HTTP proxy requests. From what I can
tell, HTTPS tunneling works fine...every time.
Still no idea why.
Back to digging. :)
> HostDB: Setting DNS TTL to "ignore" still creates many DNS lookups
> -------------------------------------------------------------------
>
> Key: TS-3750
> URL: https://issues.apache.org/jira/browse/TS-3750
> Project: Traffic Server
> Issue Type: Bug
> Components: DNS, HostDB
> Affects Versions: 6.0.0
> Reporter: Adam W. Dace
> Priority: Minor
> Fix For: 6.1.0
>
>
> In an effort to further speed my forward-only proxy cache, I've been
> experimenting with using a 1-4 hour internal TTL in HostDB(as opposed to the
> default). Many websites set their DNS TTL extremely low(i.e. 60 seconds),
> and I'd like to bypass that behavior.
> Unfortunately, according to OpenDNS my proxy is still generating roughly 1
> DNS lookup per HTTP request. I don't know why.
> I've taken a look at the codebase, but frankly it's all state machines in
> there and I don't possess the skills to identify and fix this problem. I
> have turned on debugging and can say there does appear to be a lot of DNS
> activity going on.
> If someone could take a look, I'd greatly appreciate it. I'll be happy to
> help test, also. Thanks!
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