[skip ci] Test chaos memory stress querynode (#11018)

Signed-off-by: NThreadDao <yufen.zong@zilliz.com>

tests/python_client/chaos/chaos_objects/memory_stress/chaos_querynode_memory_stress.yaml

@@ -15,4 +15,5 @@ spec:
   stressors:
     memory:
       workers: 4
-      size: 1000MB
\ No newline at end of file
+      size: 512Mi
+  duration: 5m
\ No newline at end of file

tests/python_client/chaos/test_chaos_memory_stress.py

@@ -57,37 +57,28 @@ class TestChaosData:
                 6. release and reload collection, verify search and query is available
         expected: after chaos deleted, load, search and query qre both available
         """
-        c_name = cf.gen_unique_str('chaos_memory')
-        collection_w = construct_from_data(c_name)
+        c_name = 'chaos_memory_nx6DNW4q'
+        collection_w = ApiCollectionWrapper()
+        collection_w.init_collection(c_name)
         log.debug(collection_w.schema)
+        log.debug(collection_w._shards_num)
 
         # apply memory stress
-        apply_memory_stress(chaos_yaml)
+        # apply_memory_stress(chaos_yaml)
 
         # wait memory stress
-        sleep(constants.WAIT_PER_OP * 2)
-
-        # query
-        collection_w.release()
-        collection_w.load()
-        term_expr = f'{ct.default_int64_field_name} in [0, 1, 999, 99]'
-        t0 = datetime.datetime.now()
-        query_res, _ = collection_w.query(term_expr)
-        tt = datetime.datetime.now() - t0
-        log.info(f"assert query: {tt}")
-        assert len(query_res) == 4
-
-        sleep(constants.WAIT_PER_OP * 5)
+        # sleep(constants.WAIT_PER_OP * 2)
 
         # query
         collection_w.release()
         collection_w.load()
         term_expr = f'{ct.default_int64_field_name} in [0, 1, 999, 99]'
-        t0 = datetime.datetime.now()
-        query_res, _ = collection_w.query(term_expr)
-        tt = datetime.datetime.now() - t0
-        log.info(f"assert query: {tt}")
-        assert len(query_res) == 4
+        for i in range(4):
+            t0_query = datetime.datetime.now()
+            query_res, _ = collection_w.query(term_expr)
+            tt_query = datetime.datetime.now() - t0_query
+            log.info(f"{i} query cost: {tt_query}")
+            assert len(query_res) == 4
 
     @pytest.mark.tags(CaseLabel.L3)
     @pytest.mark.parametrize('chaos_yaml', get_chaos_yamls())