PatrickRen commented on code in PR #19456:
URL: https://github.com/apache/flink/pull/19456#discussion_r894256191
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flink-connectors/flink-connector-kafka/src/test/java/org/apache/flink/connector/kafka/source/KafkaSourceITCase.java:
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@@ -309,6 +309,65 @@ public void processElement(
});
env.execute();
}
+
+ @Test
+ public void testConsumingEmptyTopic() throws Throwable {
+ String emptyTopic = "emptyTopic-" + UUID.randomUUID();
+ KafkaSourceTestEnv.createTestTopic(emptyTopic, 3, 1);
+ KafkaSource<PartitionAndValue> source =
+ KafkaSource.<PartitionAndValue>builder()
+
.setBootstrapServers(KafkaSourceTestEnv.brokerConnectionStrings)
+ .setTopics(emptyTopic)
+ .setGroupId("empty-topic-test")
+ .setDeserializer(new
TestingKafkaRecordDeserializationSchema(false))
+ .setStartingOffsets(OffsetsInitializer.earliest())
+ .setBounded(OffsetsInitializer.latest())
+ .build();
+ StreamExecutionEnvironment env =
StreamExecutionEnvironment.getExecutionEnvironment();
+ env.setParallelism(1);
+ try (CloseableIterator<PartitionAndValue> iterator =
+ env.fromSource(
+ source,
+ WatermarkStrategy.noWatermarks(),
+ "testConsumingEmptyTopic")
+ .executeAndCollect()) {
+ assertThat(iterator.hasNext()).isFalse();
+ }
+ }
+
+ @Test
+ public void testConsumingTopicWithEmptyPartitions() throws Throwable {
+ String topicWithEmptyPartitions = "topicWithEmptyPartitions-" +
UUID.randomUUID();
+ KafkaSourceTestEnv.createTestTopic(
+ topicWithEmptyPartitions,
KafkaSourceTestEnv.NUM_PARTITIONS, 1);
+ List<ProducerRecord<String, Integer>> records =
+
KafkaSourceTestEnv.getRecordsForTopicWithoutTimestamp(topicWithEmptyPartitions);
+ // Only keep records in partition 5
+ int partitionWithRecords = 5;
+ records.removeIf(record -> record.partition() !=
partitionWithRecords);
+ KafkaSourceTestEnv.produceToKafka(records);
+ KafkaSourceTestEnv.setupEarliestOffsets(
+ Collections.singletonList(
+ new TopicPartition(topicWithEmptyPartitions,
partitionWithRecords)));
+
+ KafkaSource<PartitionAndValue> source =
+ KafkaSource.<PartitionAndValue>builder()
+
.setBootstrapServers(KafkaSourceTestEnv.brokerConnectionStrings)
+ .setTopics(topicWithEmptyPartitions)
+ .setGroupId("topic-with-empty-partition-test")
+ .setDeserializer(new
TestingKafkaRecordDeserializationSchema(false))
+ .setStartingOffsets(OffsetsInitializer.earliest())
+ .setBounded(OffsetsInitializer.latest())
+ .build();
+ StreamExecutionEnvironment env =
StreamExecutionEnvironment.getExecutionEnvironment();
+ env.setParallelism(2);
Review Comment:
I'm afraid the default parallelism will be quite large on CI (# CPU cores)
and occupy too much resources. Setting parallelism to 2 is enough to reproduce
the issue.
This case is for testing the case that only some partitions are empty, so
that readers assigned with empty partitions can be closed without exception and
other readers can process messages as expected.
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