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https://issues.apache.org/jira/browse/FLINK-3102?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15045197#comment-15045197
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ASF GitHub Bot commented on FLINK-3102:
---------------------------------------
Github user StephanEwen commented on a diff in the pull request:
https://github.com/apache/flink/pull/1437#discussion_r46841698
--- Diff:
flink-streaming-connectors/flink-connector-kafka/src/main/java/org/apache/flink/streaming/connectors/kafka/internals/KafkaTopicPartition.java
---
@@ -0,0 +1,117 @@
+/*
+ * 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;
+
+import java.io.Serializable;
+import java.util.ArrayList;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+
+/**
+ * A serializable representation of a kafka topic and a partition.
+ * Used as an operator state for the Kafka consumer
+ */
+public class KafkaTopicPartition implements Serializable {
+
+ private static final long serialVersionUID = 722083576322742325L;
+
+ private String topic;
+ private int partition;
+
+ public KafkaTopicPartition(String topic, int partition) {
+ this.topic = topic;
+ this.partition = partition;
+ }
+
+ public String getTopic() {
+ return topic;
+ }
+
+ public int getPartition() {
+ return partition;
+ }
+
+ public void setTopic(String topic) {
+ this.topic = topic;
+ }
+
+ public void setPartition(int partition) {
+ this.partition = partition;
+ }
+
+ @Override
+ public String toString() {
+ return "KafkaTopicPartition{" +
+ "topic='" + topic + '\'' +
+ ", partition=" + partition +
+ '}';
+ }
+
+ @Override
+ public boolean equals(Object o) {
+ if (this == o) {
+ return true;
+ }
+ if (o == null || !(o instanceof KafkaTopicPartition)) {
+ return false;
+ }
+
+ KafkaTopicPartition that = (KafkaTopicPartition) o;
+
+ if (partition != that.partition) {
+ return false;
+ }
+ return !(topic != null ? !topic.equals(that.topic) : that.topic
!= null);
--- End diff --
Make topic a "non null" fields (check in the constructor) and save a few
cycles here...
> Allow reading from multiple topics with one FlinkKafkaConsumer
> --------------------------------------------------------------
>
> Key: FLINK-3102
> URL: https://issues.apache.org/jira/browse/FLINK-3102
> Project: Flink
> Issue Type: New Feature
> Components: Kafka Connector
> Reporter: Robert Metzger
> Assignee: Robert Metzger
>
> Currently, a Kafka consumer allows to read from only one topic.
> For cases where multiple topics contain messages with the same schema, it is
> useful to allow to subscribe to many topics using one FlinkKafkaConsumer
> instance.
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