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https://issues.apache.org/jira/browse/KAFKA-7367?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16687113#comment-16687113
]
ASF GitHub Bot commented on KAFKA-7367:
---------------------------------------
vvcephei closed pull request #5647: KAFKA-7367: Ensure stateless topologies
don't require disk access
URL: https://github.com/apache/kafka/pull/5647
This is a PR merged from a forked repository.
As GitHub hides the original diff on merge, it is displayed below for
the sake of provenance:
As this is a foreign pull request (from a fork), the diff is supplied
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diff --git
a/streams/src/test/java/org/apache/kafka/streams/integration/StatelessIntegrationTest.java
b/streams/src/test/java/org/apache/kafka/streams/integration/StatelessIntegrationTest.java
new file mode 100644
index 00000000000..f5981a984ae
--- /dev/null
+++
b/streams/src/test/java/org/apache/kafka/streams/integration/StatelessIntegrationTest.java
@@ -0,0 +1,107 @@
+package org.apache.kafka.streams.integration;
+
+import org.apache.kafka.clients.consumer.ConsumerConfig;
+import org.apache.kafka.clients.consumer.ConsumerRecord;
+import org.apache.kafka.clients.producer.ProducerConfig;
+import org.apache.kafka.common.serialization.Serdes;
+import org.apache.kafka.common.utils.SystemTime;
+import org.apache.kafka.streams.KafkaStreams;
+import org.apache.kafka.streams.KeyValue;
+import org.apache.kafka.streams.StreamsBuilder;
+import org.apache.kafka.streams.StreamsConfig;
+import org.apache.kafka.streams.Topology;
+import org.apache.kafka.streams.integration.utils.EmbeddedKafkaCluster;
+import org.apache.kafka.streams.integration.utils.IntegrationTestUtils;
+import org.apache.kafka.streams.kstream.Consumed;
+import org.apache.kafka.streams.kstream.KStream;
+import org.apache.kafka.streams.kstream.Produced;
+import org.apache.kafka.test.TestUtils;
+import org.junit.Assert;
+import org.junit.Test;
+
+import java.io.File;
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.util.List;
+import java.util.Properties;
+import java.util.UUID;
+import java.util.concurrent.ExecutionException;
+import java.util.stream.Collectors;
+
+import static java.util.Arrays.asList;
+import static
org.apache.kafka.streams.integration.utils.IntegrationTestUtils.produceKeyValuesSynchronously;
+import static
org.apache.kafka.streams.integration.utils.IntegrationTestUtils.waitUntilMinRecordsReceived;
+
+public class StatelessIntegrationTest {
+ @Test
+ public void statelessTopologiesShouldNotCreateDirectories() throws
IOException, InterruptedException, ExecutionException {
+ final EmbeddedKafkaCluster broker = new EmbeddedKafkaCluster(1);
+ broker.start();
+ broker.deleteAllTopicsAndWait(30_000L);
+
+ final String applicationId = UUID.randomUUID().toString();
+
+ final String inputTopic = "input" + applicationId;
+ final String outputTopic = "output" + applicationId;
+
+ broker.createTopic(inputTopic, 2, 1);
+ broker.createTopic(outputTopic, 2, 1);
+
+ final String path = TestUtils.tempDirectory(applicationId).getPath();
+
+ final Properties streamsConfiguration = new Properties();
+ streamsConfiguration.put(StreamsConfig.APPLICATION_ID_CONFIG,
applicationId);
+ streamsConfiguration.put(StreamsConfig.BOOTSTRAP_SERVERS_CONFIG,
broker.bootstrapServers());
+
streamsConfiguration.put(StreamsConfig.CACHE_MAX_BYTES_BUFFERING_CONFIG, 0);
+ streamsConfiguration.put(StreamsConfig.STATE_DIR_CONFIG, path);
+ streamsConfiguration.put(StreamsConfig.COMMIT_INTERVAL_MS_CONFIG,
1000);
+ streamsConfiguration.put(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG,
"earliest");
+
streamsConfiguration.put(IntegrationTestUtils.INTERNAL_LEAVE_GROUP_ON_CLOSE,
true);
+
+ final StreamsBuilder builder = new StreamsBuilder();
+ final KStream<String, String> input = builder.stream(inputTopic,
Consumed.with(Serdes.String(), Serdes.String()));
+ final KStream<String, String> filter = input.filter((k, s) ->
s.length() % 2 == 0);
+ final KStream<String, String> map = filter.map((k, v) -> new
KeyValue<>(k, k + v));
+ map.to(outputTopic, Produced.with(Serdes.String(), Serdes.String()));
+
+ final Topology topology = builder.build();
+ final KafkaStreams kafkaStreams = new KafkaStreams(topology,
streamsConfiguration);
+ try {
+ kafkaStreams.start();
+
+ final Properties producerConfig = new Properties();
+ producerConfig.put(ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG,
Serdes.String().serializer().getClass());
+ producerConfig.put(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG,
Serdes.String().serializer().getClass());
+ producerConfig.put(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG,
broker.bootstrapServers());
+ produceKeyValuesSynchronously(
+ inputTopic,
+ asList(new KeyValue<>("a", "b"), new KeyValue<>("c", "de")),
producerConfig,
+ new SystemTime()
+ );
+
+ final Properties consumerConfig = new Properties();
+ consumerConfig.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG,
Serdes.String().deserializer().getClass());
+ consumerConfig.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG,
Serdes.String().deserializer().getClass());
+ consumerConfig.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG,
broker.bootstrapServers());
+ consumerConfig.put(ConsumerConfig.GROUP_ID_CONFIG, "mygroup");
+
+ waitUntilMinRecordsReceived(
+ consumerConfig,
+ outputTopic,
+ 1
+ );
+
+ if (new File(path).exists()) {
+ final List<Path> collect =
+ Files.find(Paths.get(path), 999, (p, bfa) ->
true).collect(Collectors.toList());
+ Assert.fail(path + " should not have existed, but it did: " +
collect);
+ }
+
+ } finally {
+ kafkaStreams.close();
+ kafkaStreams.cleanUp();
+ }
+ }
+}
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> Streams should not create state store directories unless they are needed
> ------------------------------------------------------------------------
>
> Key: KAFKA-7367
> URL: https://issues.apache.org/jira/browse/KAFKA-7367
> Project: Kafka
> Issue Type: Improvement
> Components: streams
> Reporter: John Roesler
> Assignee: Kamal Chandraprakash
> Priority: Major
> Labels: newbie
>
> Streams currently unconditionally creates state store directories, even if
> the topology is stateless.
> This can be a problem running Streams in an environment without access to
> disk.
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