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https://issues.apache.org/jira/browse/FLINK-6998?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16102102#comment-16102102
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ASF GitHub Bot commented on FLINK-6998:
---------------------------------------
Github user StephanEwen commented on a diff in the pull request:
https://github.com/apache/flink/pull/4187#discussion_r129663181
--- 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 {
--- End diff --
I think it would be nice to have two methods here: `onSuccess()` and
`onException(...)`.
Or does this have to be a SAM interface so you can use lambdas?
> Kafka connector needs to expose metrics for failed/successful offset commits
> in the Kafka Consumer callback
> -----------------------------------------------------------------------------------------------------------
>
> Key: FLINK-6998
> URL: https://issues.apache.org/jira/browse/FLINK-6998
> Project: Flink
> Issue Type: Improvement
> Components: Kafka Connector
> Reporter: Zhenzhong Xu
> Assignee: Zhenzhong Xu
>
> Propose to add "kafkaCommitsSucceeded" and "kafkaCommitsFailed" metrics in
> KafkaConsumerThread class.
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