update history

ajkr · May 6, 2017 · 74ffb15 · 74ffb15
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 * DB::ResetStats() to reset internal stats.
 * Statistics::Reset() to reset user stats.
 * ldb add option --try_load_options, which will open DB with its own option file.
+* Change ticker/histogram statistics implementations to use core-local storage. This improves aggregation speed compared to our previous thread-local approach, particularly for applications with many threads.
 
 ## 5.4.0 (04/11/2017)
 ### Public API Change