Github user StephanEwen commented on a diff in the pull request:
https://github.com/apache/flink/pull/4187#discussion_r129663458
--- Diff:
flink-connectors/flink-connector-kafka-base/src/main/java/org/apache/flink/streaming/connectors/kafka/internals/KafkaCommitCallback.java
---
@@ -0,0 +1,34 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.flink.streaming.connectors.kafka.internals;
+
+/**
+ * A callback interface that the source operator can implement to trigger
custom actions when a commit request completes,
+ * which should normally be triggered from checkpoint complete event.
+ */
+public interface KafkaCommitCallback {
+
+ /**
+ * A callback method the user can implement to provide asynchronous
handling of commit request completion.
+ * This method will be called when the commit request sent to the
server has been acknowledged.
+ *
+ * @param exception The exception thrown during processing of the
request, or null if the commit completed successfully
+ */
+ void onComplete(Exception exception);
--- End diff --
Most other exception handlers take a `Throwable`. Would it make sense to do
that here as well?
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