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https://issues.apache.org/jira/browse/SLING-3028?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13768263#comment-13768263
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Carsten Ziegeler commented on SLING-3028:
-----------------------------------------

Right - this is right now mutual exclusive and I'm wondering if this is a real 
use case :) In your scenario you could simply set the number of steps to 5 and 
increase by two for the second and third part of your three part process. No 
need to set the ETA. Once the first step is done, the ETA can be estimated by 
the available information: five steps and the duration for step one.
                
> Support for progress tracking of jobs
> -------------------------------------
>
>                 Key: SLING-3028
>                 URL: https://issues.apache.org/jira/browse/SLING-3028
>             Project: Sling
>          Issue Type: Improvement
>          Components: Extensions
>            Reporter: Victor Saar
>              Labels: jobs
>         Attachments: SLING-3028.patch
>
>
> For long-running jobs, it would be useful to have some means to track 
> progress, which can be shown in a console for the user. This should include 
> the following:
> * ETA
> * Completeness value computed from (optional, defaults to 1.0) max and 
> current value (e.g. 42% or 23/100)
> * Log output stream for detailed progress information
> * Failure reason in case job failed
> AFAICS this requires a few changes to the existing implementation:
> * Jobs need additional support for setting properties, e.g. max and current 
> progress value
> * Jobs need to be kept at least for a while after they completed/failed to 
> give access to failure information/log stream

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