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https://issues.apache.org/jira/browse/TS-1079?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13241974#comment-13241974
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Leif Hedstrom commented on TS-1079:
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Fwiw, I measure about 4% slowdown or so.
> Add an API function to turn debugging on for specific transactions/sessions
> ---------------------------------------------------------------------------
>
> Key: TS-1079
> URL: https://issues.apache.org/jira/browse/TS-1079
> Project: Traffic Server
> Issue Type: Improvement
> Components: Core, HTTP
> Reporter: Uri Shachar
> Assignee: Leif Hedstrom
> Priority: Minor
> Fix For: 3.1.4
>
> Attachments: debug_specific.patch, debug_specific_2.patch,
> debug_specific_3.patch
>
> Original Estimate: 72h
> Remaining Estimate: 72h
>
> When attempting to troubleshoot issues on a production ATS system, it
> is often impossible/difficult to turn on any of the 'high-volume' debug tags
> like http due to the performance impact.
>
> This enhancement allows a plugin to set a debug flag for a specific txn/ssn,
> and replaces some of the internal Debug calls with a new function that checks
> if the flag is turned on, and outputs the debug line regardless of the tag if
> it is (The diags enable/disable flag is still taken into account).
> The API will also have TSDebugSpecific in order to allow plugins to use the
> same functionality.
> In addition, we might consider adding an internal config file (remap-like) to
> allow turning this flag on without plugin intervention.
>
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