fix unnormal size bug

db/db_impl.cc

@@ -1742,7 +1742,14 @@ void DBImpl::GarbageCollect() {
       valuelog_set.emplace(filename);
     }
   }
+  bool tmp_judge=false;//only clean one file
   for (std::string valuelog_name : valuelog_set) {
+    if(tmp_judge){
+      break;
+    }
+    else{
+      tmp_judge=true;
+    }
     uint64_t cur_log_number = GetValueLogID(valuelog_name);
     valuelog_name = ValueLogFileName(dbname_, cur_log_number);
     if (cur_log_number == valuelogfile_number_) {