afs commented on issue #1252:
URL: https://github.com/apache/jena/issues/1252#issuecomment-1100686758

   > read calls are being blocked
   
   At what point? Compaction is a write operation but it does need to take 
exclusive access to switch the storage databases over. 
   
   To do the switchover at, it has to (1) stop new requests (2) let existing 
requests finish. Outstanding reads do mean a longer wait. Although it might be 
possible to let outstanding reads finish on the old database without block, 
that interacts with deleting the old database.


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