Resolve core issues at runtime

Author: wuxianrong

include/pika_cmd_table_manager.h

@@ -73,7 +73,6 @@ class PikaCmdTableManager {
   */
   std::unordered_map<std::string, CommandStatistics> cmdstat_map_;
   std::unordered_map<std::string, CommandStatistics> slow_command_count_;
-  std::mutex command_mutex_;
   std::shared_mutex histograms_mutex_;
   std::shared_mutex slow_command_mutex_;
   std::shared_ptr<prometheus::Registry> prometheus_registry_;

src/pika_cmd_table_manager.cc

@@ -15,9 +15,15 @@
 extern std::unique_ptr<PikaConf> g_pika_conf;
 
 void PikaCmdTableManager::ResetCommandCount() {
-  std::lock_guard<std::mutex> lock(command_mutex_);
-  slow_command_count_.clear();
-  InitHistograms(); 
+  {
+    std::unique_lock<std::shared_mutex> write_lock(slow_command_mutex_); 
+    slow_command_count_.clear();
+  }
+
+  {
+    std::unique_lock<std::shared_mutex> write_lock(histograms_mutex_);
+    InitHistograms();
+  }
 }
 
 void PikaCmdTableManager::InitHistograms() {