Commits on Mar 24, 2017

1. storage: augment command queue with timestamps for non-interfering reads …

   Previously, the command queue considered any two commands to overlap if the
   key ranges overlapped, regardless of whether the timestamps on the two
   commands guaranteed they were non-overlapping.
   
   Consider the case of a read over key ranges "a" - "z" at timestamp t=1s.
   If a write arrives for key "c" at timestamp > t=1s, then it should be
   free to proceed regardless of the disposition of the read because the
   read cannot affect the write's timestamp.
   
   Similarly, if a write is active for key "c" at timestamp t=1s, a read
   that arrives for key range "a" - "z" should be free to proceed as long
   as its timestamp is < t=1s.
   
   Note that local keys do not allow non-interference between earlier reads
   and overlapping writes.
   
   Fixes #14298

   

   spencerkimball committed Mar 24, 2017
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