chiacyu commented on code in PR #15989:
URL: https://github.com/apache/kafka/pull/15989#discussion_r1623158977


##########
connect/runtime/src/test/java/org/apache/kafka/connect/storage/KafkaConfigBackingStoreMockitoTest.java:
##########
@@ -1184,6 +1185,141 @@ public void 
testRestoreRestartRequestInconsistentState() {
         verify(configLog).stop();
     }
 
+    @Test
+    public void testPutTaskConfigsZeroTasks() throws Exception {
+        when(configLog.partitionCount()).thenReturn(1);
+
+        configStorage.setupAndCreateKafkaBasedLog(TOPIC, config);
+        verifyConfigure();
+        configStorage.start();
+
+        // Bootstrap as if we had already added the connector, but no tasks 
had been added yet
+        whiteBoxAddConnector(CONNECTOR_IDS.get(0), SAMPLE_CONFIGS.get(0), 
Collections.emptyList());
+
+        // Null before writing
+        ClusterConfigState configState = configStorage.snapshot();
+        assertEquals(-1, configState.offset());
+
+        // Task configs should read to end, write to the log, read to end, 
write root.
+        
doAnswer(expectReadToEnd(Collections.emptyMap())).when(configLog).readToEnd();
+
+        expectConvertWriteRead(
+                COMMIT_TASKS_CONFIG_KEYS.get(0), 
KafkaConfigBackingStore.CONNECTOR_TASKS_COMMIT_V0, CONFIGS_SERIALIZED.get(0),
+                "tasks", 0); // We have 0 tasks
+
+        configStorage.putTaskConfigs("connector1", Collections.emptyList());
+
+        // As soon as root is rewritten, we should see a callback notifying us 
that we reconfigured some tasks
+        configUpdateListener.onTaskConfigUpdate(Collections.emptyList());

Review Comment:
   Thanks for the example, would apply. 



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