josh-mckenzie opened a new pull request, #1821:
URL: https://github.com/apache/cassandra/pull/1821

   While ultimately we could serve to have a real scheduler and single entry 
point for compactions, for now some moderate progress seems in order. There are 
cases where, during expansions, you can end up in a state where you can't 
finish upgrading sstables as they keep getting aborted by Incremental Repair 
and other operations that ultimately should be lower priority and not have the 
ability to cancel these operations.
   
   The idea here is that tasks like upgradestables and cleanup (and other tasks 
that have the same priority) will get serialised since markAllCompacting is 
synchronising on data, and higher priority tasks will be able to still cancel 
others via runWithCompactionsDisabled.


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