rkhachatryan commented on code in PR #20313:
URL: https://github.com/apache/flink/pull/20313#discussion_r927001242


##########
flink-runtime/src/test/java/org/apache/flink/runtime/state/SharedStateRegistryTest.java:
##########
@@ -182,20 +194,113 @@ public void testRegisterChangelogStateBackendHandles() 
throws InterruptedExcepti
     }
 
     @Test
-    public void testUnregisterUnusedState() {
+    public void testUnregisterUnusedSavepointState() {
         SharedStateRegistry sharedStateRegistry = new 
SharedStateRegistryImpl();
         TestingStreamStateHandle handle = new TestingStreamStateHandle();
-        sharedStateRegistry.registerReference(new 
SharedStateRegistryKey("first"), handle, 1L);
-        sharedStateRegistry.registerReference(new 
SharedStateRegistryKey("first"), handle, 2L);
-        sharedStateRegistry.registerReference(new 
SharedStateRegistryKey("first"), handle, 3L);
+
+        registerInitialCheckpoint(
+                sharedStateRegistry,
+                RESTORED_STATE_ID,
+                CheckpointProperties.forSavepoint(false, 
SavepointFormatType.NATIVE));
+
+        sharedStateRegistry.registerReference(
+                new SharedStateRegistryKey(RESTORED_STATE_ID), handle, 2L);
+        sharedStateRegistry.registerReference(
+                new SharedStateRegistryKey(RESTORED_STATE_ID), handle, 3L);
+        sharedStateRegistry.registerReference(
+                new SharedStateRegistryKey("new-state"), new 
TestingStreamStateHandle(), 4L);
+
+        assertEquals(
+                "Only the initial checkpoint should be retained because its 
state is in use",
+                singleton(1L),
+                sharedStateRegistry.unregisterUnusedState(3));
+        assertTrue(
+                "The initial checkpoint state is unused so it could be 
discarded",
+                sharedStateRegistry.unregisterUnusedState(4).isEmpty());

Review Comment:
   Right, added `testUnregisterNonInitialCheckpoint` test.



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