Refine the statistics

include/rocksdb/statistics.h

@@ -7,7 +7,6 @@
 #define STORAGE_ROCKSDB_INCLUDE_STATISTICS_H_
 
 #include <atomic>
-#include <cassert>
 #include <cstddef>
 #include <cstdint>
 #include <string>
@@ -18,10 +17,8 @@ namespace rocksdb {
 
 /**
  * Keep adding ticker's here.
- * Any ticker should have a value less than TICKER_ENUM_MAX.
- * Add a new ticker by assigning it the current value of TICKER_ENUM_MAX
- * Add a string representation in TickersNameMap below.
- * And incrementing TICKER_ENUM_MAX.
+ *  1. Any ticker should be added before TICKER_ENUM_MAX.
+ *  2. Add a readable string in TickersNameMap below for the newly added ticker.
  */
 enum Tickers {
   // total block cache misses
@@ -159,7 +156,7 @@ const std::vector<std::pair<Tickers, std::string>> TickersNameMap = {
   { NUMBER_OF_RESEEKS_IN_ITERATION,   "rocksdb.number.reseeks.iteration"     },
   { GET_UPDATES_SINCE_CALLS,          "rocksdb.getupdatessince.calls"        },
   { BLOCK_CACHE_COMPRESSED_MISS,      "rocksdb.block.cachecompressed.miss"   },
-  { BLOCK_CACHE_COMPRESSED_HIT, "rocksdb.block.cachecompressed.hit" }
+  { BLOCK_CACHE_COMPRESSED_HIT,       "rocksdb.block.cachecompressed.hit"    },
 };
 
 /**
@@ -254,7 +251,7 @@ class Ticker {
     count_ = count;
   }
 
-  inline void recordTick(int count = 1) {
+  inline void recordTick(int64_t count = 1) {
     count_ += count;
   }
 
@@ -269,13 +266,12 @@ class Ticker {
 // Analyze the performance of a db
 class Statistics {
  public:
-
   virtual long getTickerCount(Tickers tickerType) = 0;
   virtual void recordTick(Tickers tickerType, uint64_t count = 0) = 0;
   virtual void setTickerCount(Tickers tickerType, uint64_t count) = 0;
   virtual void measureTime(Histograms histogramType, uint64_t time) = 0;
 
-  virtual void histogramData(Histograms type, HistogramData * const data) = 0;
+  virtual void histogramData(Histograms type, HistogramData* const data) = 0;
   // String representation of the statistic object.
   std::string ToString();
 };

util/statistics_imp.h

@@ -11,7 +11,7 @@ namespace rocksdb {
 // Utility functions
 inline void RecordTick(Statistics* statistics,
                        Tickers ticker,
-                       uint64_t count = 1) {
+                       int64_t count = 1) {
   assert(HistogramsNameMap.size() == HISTOGRAM_ENUM_MAX);
   assert(TickersNameMap.size() == TICKER_ENUM_MAX);
   if (statistics) {