mayuehappy commented on a change in pull request #17525:
URL: https://github.com/apache/flink/pull/17525#discussion_r742142498



##########
File path: 
flink-runtime/src/test/java/org/apache/flink/runtime/state/StateBackendTestBase.java
##########
@@ -460,22 +461,66 @@ public void testGetKeysAndNamespaces() throws Exception {
                     backend.getPartitionedState(
                             ns1,
                             StringSerializer.INSTANCE,
-                            new ValueStateDescriptor<>(fieldName, 
IntSerializer.INSTANCE));
+                            new ValueStateDescriptor<>(
+                                    valueStateFieldName, 
IntSerializer.INSTANCE));
+
+            MapState<Integer, Integer> keyedState2 =

Review comment:
       In addition, I observed that similar tests in StateBackendTestBase seem 
to have some duplicate codes.(eg `testListStateRestoreWithWrongSerializers`\ 
`testValueStateRestoreWithWrongSerializers` 
`testMapStateRestoreWithWrongSerializers`)
   So maybe it's also fine to add a new test as 
`#testMapStateGetKeysAndNamespace` just like` #testMapStateGetKeys ` or do u 
have some other greater suggestions ? 




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