Commits on Jun 12, 2018

1. blockchain: Optimize exported header access. …

   This optimizes the FetchHeader function to make use of the fact that all
   block nodes are now in memory and therefore it is no longer necessary to
   consult the database for them.
   
   It also renames the function to HeaderByHash so it is consistent with
   other similar functions such as HeaderByHeight, BlockByHash, and
   BlockByHeight and updates all callers in the repo accordingly.
   
   This speeds up fetching all of the headers in the chain by roughly 3x to
   4x for a chain height of 246,000 headers.  Longer chains will benefit
   more.
   
   For example, here is some timing information before and after this
   commit plus the full block index in memory commit for 246,000 headers:
   
   7200 RPM HDD:
   -------------
   Previous fetch time: ~15.76s
   New fetch time: ~4.17s
   
   SSD:
   ----
   Previous fetch time: ~12.63s
   New fetch time: ~4.17s

   

   davecgh committed Jun 12, 2018
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