ivanyu commented on code in PR #6934:
URL: https://github.com/apache/kafka/pull/6934#discussion_r1587938094


##########
connect/runtime/src/test/java/org/apache/kafka/connect/runtime/distributed/DistributedHerderTest.java:
##########
@@ -2336,6 +2336,95 @@ public void testPutConnectorConfig() throws Exception {
         verifyNoMoreInteractions(worker, member, configBackingStore, 
statusBackingStore);
     }
 
+    @Test
+    public void testPatchConnectorConfigNotFound() {
+        ClusterConfigState clusterConfigState = new ClusterConfigState(
+                0,
+                null,
+                Collections.emptyMap(),
+                Collections.emptyMap(),
+                Collections.emptyMap(),
+                Collections.emptyMap(),
+                Collections.emptyMap(),
+                Collections.emptyMap(),
+                Collections.emptySet(),
+                Collections.emptySet());
+        expectConfigRefreshAndSnapshot(clusterConfigState);
+
+        Map<String, String> connConfigPatch = new HashMap<>();
+        connConfigPatch.put("foo1", "baz1");
+
+        FutureCallback<Herder.Created<ConnectorInfo>> patchCallback = new 
FutureCallback<>();
+        herder.patchConnectorConfig(CONN2, connConfigPatch, patchCallback);
+        herder.tick();
+        assertTrue(patchCallback.isDone());
+        ExecutionException exception = assertThrows(ExecutionException.class, 
patchCallback::get);
+        assertInstanceOf(NotFoundException.class, exception.getCause());
+    }
+
+    @Test
+    public void testPatchConnectorConfig() throws Exception {
+        when(member.memberId()).thenReturn("leader");
+        expectRebalance(1, Arrays.asList(CONN1), Collections.emptyList(), 
true);
+        
when(statusBackingStore.connectors()).thenReturn(Collections.emptySet());
+
+        Map<String, String> originalConnConfig = new HashMap<>(CONN1_CONFIG);
+        originalConnConfig.put("foo1", "bar1");
+        originalConnConfig.put("foo2", "bar2");

Review Comment:
   Yes, good idea. Done here and in `StandaloneHerderTest` too.



##########
connect/runtime/src/test/java/org/apache/kafka/connect/runtime/standalone/StandaloneHerderTest.java:
##########
@@ -751,6 +754,74 @@ public void testPutConnectorConfig() throws Exception {
         verifyNoMoreInteractions(connectorConfigCb);
     }
 
+    @Test
+    public void testPatchConnectorConfigNotFound() {
+        Map<String, String> connConfigPatch = new HashMap<>();
+        connConfigPatch.put("foo1", "baz1");
+
+        Callback<Herder.Created<ConnectorInfo>> patchCallback = 
mock(Callback.class);
+        herder.patchConnectorConfig(CONNECTOR_NAME, connConfigPatch, 
patchCallback);
+
+        ArgumentCaptor<NotFoundException> exceptionCaptor = 
ArgumentCaptor.forClass(NotFoundException.class);
+        verify(patchCallback).onCompletion(exceptionCaptor.capture(), 
isNull());
+        assertEquals(exceptionCaptor.getValue().getMessage(), "Connector " + 
CONNECTOR_NAME + " not found");
+        assertNull(exceptionCaptor.getValue().getCause());
+    }
+
+    @Test
+    public void testPatchConnectorConfig() throws ExecutionException, 
InterruptedException, TimeoutException {
+        // Create the connector.
+        Map<String, String> originalConnConfig = 
connectorConfig(SourceSink.SOURCE);
+        originalConnConfig.put("foo1", "bar1");
+        originalConnConfig.put("foo2", "bar2");

Review Comment:
   Done



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