atomic backoff_end_time added

dbms/src/Dictionaries/CacheDictionary.cpp

@@ -821,7 +821,7 @@ void CacheDictionary::update(BunchUpdateUnit & bunch_update_unit) const
 
     const auto now = std::chrono::system_clock::now();
 
-    if (now > backoff_end_time)
+    if (now > backoff_end_time.load())
     {
         try
         {
@@ -902,7 +902,7 @@ void CacheDictionary::update(BunchUpdateUnit & bunch_update_unit) const
             backoff_end_time = now + std::chrono::seconds(calculateDurationWithBackoff(rnd_engine, error_count));
 
             tryLogException(last_exception, log, "Could not update cache dictionary '" + getFullName() +
-                                                 "', next update is scheduled at " + ext::to_string(backoff_end_time));
+                                                 "', next update is scheduled at " + ext::to_string(backoff_end_time.load()));
         }
     }
 

dbms/src/Dictionaries/CacheDictionary.h

@@ -318,7 +318,7 @@ private:
 
     mutable std::exception_ptr last_exception;
     mutable std::atomic<size_t> error_count = 0;
-    mutable std::chrono::system_clock::time_point backoff_end_time;
+    mutable std::atomic<std::chrono::system_clock::time_point> backoff_end_time;
 
     mutable pcg64 rnd_engine;