chibenwa opened a new pull request #579:
URL: https://github.com/apache/james-project/pull/579


   A common mis-configuration of the Distributed mailqueue is to attempt to
   update the browse start too often, which results in attempts to update the
   browse start while we are already in the last slice.
   
   Repeatedly trying to needlessly update the browse start can seriously 
undermine
   application performance as browsing the mail queue is no cheap task.
   
   Hopefully prior to attempt to update the browse start, we can ensure the 
browse start is not the current slice.
   Thus mis-configurations are mitigated and will not result in hammering 
browse start update of the current slice
   (mis-configuration however can result in suboptimal concurrently triggered 
browse start updates when switching
   slices, operators should still ensure their "updateBrowseStartPace" are 
adequate, but failures to do so becomes
   less problematic)


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