keith-turner opened a new pull request, #4819:
URL: https://github.com/apache/accumulo/pull/4819

   Before this change when a tablet was closing it would prevent new scans from 
starting and wait for running scans to finish.  This could cause the tablet to 
become unavailable for long periods of time.  After this change tablets will no 
longer wait on running scans to complete.  They will set something to interrupt 
the thread and then disable the client scan session which prevents the client 
form ever seeing any data after the tablet is closed.  Once all scan sessions 
are disabled the tablet will proceed to close.  Disabling the scan session will 
cause the client side scanner to eventually switch to the new tablet server 
where the tablet is loaded.
   
   Its possible that threads may be left running on the tablet server therefore 
it will be important to also implement #4756
   
   fixes #4757


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