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https://issues.apache.org/jira/browse/SLING-3028?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13754518#comment-13754518
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Jeff Young commented on SLING-3028:
-----------------------------------

+1 on keeping failed jobs forever.

As for keeping non-failed jobs, you might want an audit trail of some sort.  
Then again, those jobs could choose to write whatever was needed to the log, so 
perhaps that's not enough of a reason to allow keeping of other jobs.

But then how does the client get info for putting up the finished progress 
("Copied 934 of 934 files", or whatever)?
                
> 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
>
> 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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