AlinsRan commented on code in PR #12214:
URL: https://github.com/apache/apisix/pull/12214#discussion_r2094960175


##########
apisix/core/config_yaml.lua:
##########
@@ -256,12 +281,26 @@ local function sync_data(self)
             end
 
             if data_valid then
-                insert_tab(self.values, conf_item)
-                local item_id = conf_item.value.id or self.key .. "#" .. id
-                item_id = tostring(item_id)
-                self.values_hash[item_id] = #self.values
-                conf_item.value.id = item_id
-                conf_item.clean_handlers = {}
+                local item_id = tostring(id)
+                local pre_index = self.values_hash[item_id]
+                if pre_index then
+                    -- remove the old item
+                    local pre_val = self.values[pre_index]
+                    if pre_val and
+                        (not pre_val.modifiedIndex or pre_val.modifiedIndex ~= 
modifiedIndex) then
+                        log.error("fire all clean handlers for ", self.key, " 
id: ", id,
+                                    " modifiedIndex: ", modifiedIndex)
+                        config_util.fire_all_clean_handlers(pre_val)
+                        self.values[pre_index] = conf_item
+                        conf_item.value.id = item_id
+                        conf_item.clean_handlers = {}
+                    end

Review Comment:
   In the above processing, if the ID is the same and there is a modifiedIndex, 
it will not be overwritten. Here, the old table that satisfies the change will 
be overwritten and updated.



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