Commits on Oct 21, 2019

1. libroach: bump up rocksdb backpressure limits …

   System-critical writes in Cockroach, like node-liveness, just can not be
   slow or they will fail, meaning that if theese rocksdb back-pressure
   slowdowns ever kick in, they usually do not gradually slow traffic
   until the system reaches some stable throughput equilibrium as intended,
   but rather cause liveness to fail and result in sudden  unavailability
   -- the opposite of what they were intended to do.
   
   Thus we are probably better off just letting the metrics they were
   intended to protect -- like read-amplification or compaction debt --
   stray further into unhealthy territory, than we are back-pressuring and
   hastening our demise: slower reads due to elevated read-amp are still
   better than no reads due to node-liveness failures (and indeed slower
   reads may serve as their own backpressure as we usually need to read to
   write).
   
   Release note: None

   

   dt committed Oct 21, 2019
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