tzssangglass commented on a change in pull request #6282:
URL: https://github.com/apache/apisix/pull/6282#discussion_r816438024



##########
File path: t/discovery/nacos2.t
##########
@@ -112,3 +112,105 @@ GET /hello
 --- error_code_like: ^(?:50\d)$
 --- error_log
 nacos login fail
+
+
+
+=== TEST 3: same service is registered in route, service and upstream, 
de-duplicate
+--- yaml_config
+apisix:
+  node_listen: 1984
+  admin_key: null
+--- extra_yaml_config
+discovery:
+  nacos:
+      host:
+        - "http://127.0.0.1:8858";
+      fetch_interval: 1
+--- config
+    location /t {
+        content_by_lua_block {
+            local t = require("lib.test_admin").test
+
+            local code, body = t('/apisix/admin/routes/1',
+                 ngx.HTTP_PUT,
+                 [[{
+                    "uri": "/hello",
+                    "upstream": {
+                        "service_name": "APISIX-NACOS",
+                        "discovery_type": "nacos",
+                        "scheme": "http",
+                        "type": "roundrobin",
+                        "discovery_args": {
+                          "namespace_id": "public",
+                          "group_name": "DEFAULT_GROUP"
+                        }
+                    }
+                }]]
+                )
+
+            if code >= 300 then
+                ngx.status = code
+            end
+
+            local code, body = t('/apisix/admin/services/1',
+                ngx.HTTP_PUT,
+                [[{
+                    "upstream": {
+                        "type": "roundrobin",
+                        "scheme": "http",
+                        "discovery_type": "nacos",
+                        "pass_host": "pass",
+                        "service_name": "APISIX-NACOS",
+                        "discovery_args": {
+                          "namespace_id": "public",
+                          "group_name": "DEFAULT_GROUP"
+                        }
+                    }
+                }]]
+            )
+
+            if code >= 300 then
+                ngx.status = code
+            end
+
+            local code, body = t('/apisix/admin/upstreams/1',
+                ngx.HTTP_PUT,
+                [[{
+                    "type": "roundrobin",
+                    "scheme": "http",
+                    "discovery_type": "nacos",
+                    "pass_host": "pass",
+                    "service_name": "APISIX-NACOS",
+                    "discovery_args": {
+                    "namespace_id": "public",
+                    "group_name": "DEFAULT_GROUP"
+                    }
+                }]]
+            )
+
+            if code >= 300 then
+                ngx.status = code
+            end
+
+            ngx.sleep(1.5)
+
+            local json_decode = require("toolkit.json").decode
+            local http = require "resty.http"
+            local httpc = http.new()
+            local dump_uri = "http://127.0.0.1:"; .. ngx.var.server_port .. 
"/v1/discovery/nacos/dump"
+            local res, err = httpc:request_uri(dump_uri, { method = "GET"})
+            if err then
+                ngx.log(ngx.ERR, err)
+                ngx.status = res.status
+                return
+            end
+
+            local body = json_decode(res.body)
+            local services = body.services
+            local service = services["public"]["DEFAULT_GROUP"]["APISIX-NACOS"]
+            local number = table.getn(service)
+            ngx.say(number)
+        }
+    }
+--- response_body
+2

Review comment:
       In fact, it is 2 instances of the same service. In docker-compose, the 2 
service instances are started with the same namespace, group and service name, 
but have different exposed ports, which is equivalent to different instances of 
the same service registered to nacos.
   
   docker-compose:
   
https://github.com/apache/apisix/blob/48398d3f1501fe425b08673609605ea9d8039f54/ci/pod/docker-compose.yml#L230-L263
   
   these 2 service instances on nacos-dashboard:
   
   ![51646108152_ 
pic](https://user-images.githubusercontent.com/30819887/156103837-28f12de9-2abd-4ad8-af8e-99ccc6da5a86.jpg)
   
   Before de-duplication, the number of APISIX fetches to these two services is 
6:
   https://github.com/apache/apisix/runs/5180101415?check_suite_focus=true
   ![61646108418_ 
pic](https://user-images.githubusercontent.com/30819887/156104268-64d60f6d-b969-45a0-a931-942c389f6e13.jpg)
   
   6 = 2 instances * ( in route + in service + in upstream )
   




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