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https://issues.apache.org/jira/browse/TS-4436?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15317217#comment-15317217
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Thomas Jackson commented on TS-4436:
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[~psudaemon] need to backport
https://github.com/apache/trafficserver/pull/695/commits/0dc02ff5a268c2747cbc7f2b1b69b5737bf45434
-- per [~amc]'s comment on the PR :)
> ATS' tracking of host failures is broken for entries acquired through the
> hosts file
> ------------------------------------------------------------------------------------
>
> Key: TS-4436
> URL: https://issues.apache.org/jira/browse/TS-4436
> Project: Traffic Server
> Issue Type: Bug
> Components: HostDB
> Reporter: Thomas Jackson
> Assignee: Thomas Jackson
> Fix For: 6.2.0, 7.0.0
>
>
> The current implementation of the hosts file maintains a map of name to
> hostdbinfo, which means that any lookups that come into the probe method
> return the same hostdbinfo struct. This means that any requests to a given
> address (regardless of port) recieve the same HostDBInfo struct-- which in
> turn means that the up/down status is global to the IP instead of per ip/port
> pair.
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