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https://issues.apache.org/jira/browse/TS-3720?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14606846#comment-14606846
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Thomas Jackson commented on TS-3720:
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Specifically we need to backport
https://github.com/jacksontj/trafficserver/commit/6a8cb988fb19ab36140da6be737b88bf4e99d63d
> HostDB no longer keeps track of host failures
> ---------------------------------------------
>
> Key: TS-3720
> URL: https://issues.apache.org/jira/browse/TS-3720
> Project: Traffic Server
> Issue Type: Bug
> Affects Versions: 5.3.0, 6.0.0
> Reporter: Thomas Jackson
> Assignee: Thomas Jackson
>
> If ATS's DNS response was N A records, and one is unavailable ATS will always
> send traffic to the down real irregardless of configuration. This bug seems
> to be due to how hostdb is keeping track of DNS + health of the real.
> Regression was introduced in https://issues.apache.org/jira/browse/TS-3237
> (https://git-wip-us.apache.org/repos/asf?p=trafficserver.git;h=a8d1862).
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