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https://issues.apache.org/jira/browse/TS-1079?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13227035#comment-13227035
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Uri Shachar commented on TS-1079:
---------------------------------
Patch includes a 'not pretty' macro in
HttpSM.cc/HttpTransact.cc/HttpClientSession.cc to make debug lines shorter. It
would be a lot prettier if we didn't have to support all sorts of compilers --
doing something like:
{code:title=HttpSM.cc|borderStyle=solid}
#define DebugSM(tag, format, ...) DebugSpecific(debug_on, tag, "[%" PRId64 "]
"format, sm_id, ##__VA_ARGS__)
{code}
Would look nicer and ensure debug lines are more consistent -- but isn't
possible without a whole bunch of ifdefs when trying to support a lot of
different compilers.
Maybe I should raise this in the mailing list...
/rant
> 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
> Priority: Minor
> Fix For: 3.1.6
>
> Attachments: debug_specific.patch, debug_specific_2.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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