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https://issues.apache.org/jira/browse/FLINK-8500?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16466166#comment-16466166
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ASF GitHub Bot commented on FLINK-8500:
---------------------------------------
Github user FredTing commented on a diff in the pull request:
https://github.com/apache/flink/pull/5958#discussion_r186480680
--- Diff:
flink-core/src/main/java/org/apache/flink/api/common/serialization/ConsumerRecordMetaInfo.java
---
@@ -0,0 +1,73 @@
+/*
+ * 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.api.common.serialization;
+
+import org.apache.flink.annotation.Public;
+
+/**
+ * The consumer record meta info contains, besides the actual message,
some meta information, such as
+ * key, topic, partition, offset and timestamp for Apache kafka
+ *
+ * <p><b>Note:</b>The timestamp is only valid for Kafka clients 0.10+, for
older versions the value has the value `Long.MinValue` and
+ * the timestampType has the value `NO_TIMESTAMP_TYPE`.
+ */
+@Public
+public interface ConsumerRecordMetaInfo {
+ /**
+ * The TimestampType is introduced in the kafka clients 0.10+. This
interface is also used for the Kafka connector 0.9
+ * so a local enumeration is needed.
+ */
+ enum TimestampType {
+ NO_TIMESTAMP_TYPE, CREATE_TIME, INGEST_TIME
+ }
+
+ /**
+ * @return the key as a byte array (null if no key has been set).
+ */
+ byte[] getKey();
+
+ /**
+ * @return The message, as a byte array (null if the message was empty
or deleted).
+ */
+ byte[] getMessage();
+
+ /**
+ * @return The topic the message has originated from (for example the
Kafka topic).
+ */
+ String getTopic();
+
+ /**
+ * @return The partition the message has originated from (for example
the Kafka partition).
+ */
+ int getPartition();
+
+ /**
+ * @return the offset of the message in the original source (for
example the Kafka offset).
+ */
+ long getOffset();
+
+ /**
+ * @return the timestamp of the consumer record
--- End diff --
I've added some more comments
> Get the timestamp of the Kafka message from kafka consumer(Kafka010Fetcher)
> ---------------------------------------------------------------------------
>
> Key: FLINK-8500
> URL: https://issues.apache.org/jira/browse/FLINK-8500
> Project: Flink
> Issue Type: Improvement
> Components: Kafka Connector
> Affects Versions: 1.4.0
> Reporter: yanxiaobin
> Priority: Major
> Fix For: 1.6.0
>
> Attachments: image-2018-01-30-14-58-58-167.png,
> image-2018-01-31-10-48-59-633.png
>
>
> The method deserialize of KeyedDeserializationSchema needs a parameter
> 'kafka message timestamp' (from ConsumerRecord) .In some business scenarios,
> this is useful！
>
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