[jira] [Commented] (TS-905) Improve state machine around DNS lookups and handling of URL_REMAP_FOR_OS

["Susan Hinrichs (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/TS-905?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14200781#comment-14200781 ] 

Susan Hinrichs commented on TS-905:
-----------------------------------

Will be worked via the HostDB Upgrade (TS-3166).

> Improve state machine around DNS lookups and handling of URL_REMAP_FOR_OS
> -------------------------------------------------------------------------
>
>                 Key: TS-905
>                 URL: https://issues.apache.org/jira/browse/TS-905
>             Project: Traffic Server
>          Issue Type: Improvement
>          Components: DNS, HTTP
>            Reporter: Leif Hedstrom
>
> The code around DNS lookups in the HTTP state machine is somewhat odd. The same state is revisited at least twice in the case of a parent proxy lookup for example, and the internal state is not reset in between such lookups. This caused breakage of parent proxy when we added an API to bypass origin DNS lookup, as a very obscure side effect.
> Also, there's code in there for a remapping mode URL_REMAP_FOR_OS (2), which I believe we have crippled, and it's unclear exactly when it would be used. We should examine this, and either fix this mode, or disable it completely.



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