Commits on Apr 19, 2019

1. storage: Don't swallow ErrEpochAlreadyIncremented …

   IncrementEpoch was failing to distinguish between the request that
   caused the increment and another caller making the same increment.
   This is incorrect since a successful increment tells you *when* the
   node was confirmed dead, while relying on another node's increment
   leaves this uncertain.
   
   In rare cases involving a badly overloaded cluster, this could result
   in inconsistencies (non-serializable transactions) due to incorrect
   timestamp cache management.
   
   Fixes cockroachdb#35986
   
   Release note (bug fix): Fix a rare inconsistency that could occur on
   badly overloaded clusters.

   

   bdarnell committed Apr 19, 2019
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