[
https://issues.apache.org/jira/browse/KAFKA-8497?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Bruno Cadonna resolved KAFKA-8497.
----------------------------------
Resolution: Invalid
> kafka streams application takes up a lot of memory
> --------------------------------------------------
>
> Key: KAFKA-8497
> URL: https://issues.apache.org/jira/browse/KAFKA-8497
> Project: Kafka
> Issue Type: Bug
> Components: streams
> Affects Versions: 1.0.0
> Reporter: sunqing
> Priority: Major
>
>
> A simple kafka streams application, use KStream to consume data, as below。
> Memory usage is very high when there is a large amount of data under the
> consuming topic.
> Sometimes it goes up to 20G.
> This is very strange. The program doesn't do anything. It just reads the data
> and prints it to the screen. Why is the memory usage so high when there is a
> lot of data in the topic?
>
>
>
> The program code：
>
> public class TestMain {
> public static StreamsBuilder builder = new StreamsBuilder();
> public static void kafkaStreamStart() {
> KStream<String, String> stream =
> builder.stream(Arrays.asList("wk_wangxin_po"));
> Properties props = new Properties();
> props.put(StreamsConfig.APPLICATION_ID_CONFIG, "testwang_xin");
> props.put(StreamsConfig.BOOTSTRAP_SERVERS_CONFIG,
>
> "zktj-kafka-broker-out-1:29092,zktj-kafka-broker-out-2:29092,zktj-kafka-broker-out-3:29092");
> props.put(StreamsConfig.DEFAULT_KEY_SERDE_CLASS_CONFIG,
> Serdes.String().getClass());
> props.put(StreamsConfig.DEFAULT_VALUE_SERDE_CLASS_CONFIG,
> Serdes.String().getClass());
> props.put(StreamsConfig.COMMIT_INTERVAL_MS_CONFIG, 3000);
> props.put(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG, "earliest");
> props.put(StreamsConfig.NUM_STREAM_THREADS_CONFIG, 1);
> props.setProperty("security.protocol", "SASL_PLAINTEXT");
> props.setProperty("sasl.mechanism", "PLAIN");
> props.setProperty("sasl.kerberos.service.name", "kafka");
> System.setProperty("java.security.auth.login.config",
> "./conf/kafka_client_jaas.conf");
> stream.foreach(new ForeachAction<String, String>() {
> @Override
> public void apply(String key, String value)
> { System.out.println("===="); System.out.println(key); }
> });
> Topology topo = builder.build();
> KafkaStreams streams = new KafkaStreams(topo, props);
> streams.start();
> }
> public static void main(String[] args)
> { kafkaStreamStart(); }
> }
--
This message was sent by Atlassian JIRA
(v7.6.3#76005)
