[jira] [Commented] (TS-3750) HostDB: Setting DNS TTL to "ignore" still creates many DNS lookups

["Adam W. Dace (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/TS-3750?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14620482#comment-14620482 ] 

Adam W. Dace commented on TS-3750:
----------------------------------

Here's my current configuration regarding HostDB(this from records.config):

CONFIG proxy.config.hostdb.ip_resolve STRING ipv6;ipv4
CONFIG proxy.config.hostdb.size INT 49152
CONFIG proxy.config.hostdb.storage_size INT 12582912
CONFIG proxy.config.hostdb.ttl_mode INT 1
CONFIG proxy.config.hostdb.timeout INT 60
CONFIG proxy.config.hostdb.serve_stale_for INT 60
CONFIG proxy.config.cache.hostdb.sync_frequency INT 3600
CONFIG proxy.config.cache.hostdb.disable_reverse_lookup INT 1


> 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
>
> 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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