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https://issues.apache.org/jira/browse/SLING-3?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12595231#action_12595231
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Bertrand Delacretaz commented on SLING-3:
-----------------------------------------

Added RequestProgressTrackerLogFilter in revision 654519, logs 
RequestProgressTracker info at the DEBUG level, with a unique identifier for 
each request.

Example output:
REQUEST_117 -       0 (2008-05-08 15:26:32) Starting Request Processing
REQUEST_117 -       2 (2008-05-08 15:26:32) Starting ResourceResolution
REQUEST_117 -       4 (2008-05-08 15:26:32) URI=/index.html resolves to 
Resource=JcrNodeResource, type=nt:file, path=/index.html, elapsed = 2ms
REQUEST_117 -       4 (2008-05-08 15:26:32) Starting ServletResolution
REQUEST_117 -       9 (2008-05-08 15:26:32) URI=/index.html handled by 
Servlet=DefaultGetServlet, elapsed = 5ms
REQUEST_117 -      10 (2008-05-08 15:26:32) Starting 
org.apache.sling.servlets.DefaultGetServlet#0
REQUEST_117 -      10 (2008-05-08 15:26:32) 
org.apache.sling.servlets.DefaultGetServlet#0, elapsed = 0ms

That's only a first step towards making the RequestProgressTracker info 
available, of course having it in the generated pages would be useful as well.

> Use RequestProgressTracker to log request processing steps
> ----------------------------------------------------------
>
>                 Key: SLING-3
>                 URL: https://issues.apache.org/jira/browse/SLING-3
>             Project: Sling
>          Issue Type: Improvement
>          Components: Core, JSP, Resource, Scripting, ServletResolver
>            Reporter: Felix Meschberger
>
> The RequestProgressTacker interface defines an API which may be used to track 
> the process of request processing. Parties taking part in request processing, 
> most notably resource resolution, script and servlet resolution and also 
> request filters should track their progress in the tracker.

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