Update TTL for a particular topic in kafka using Java

Question

Update TTL for a topic so records stay in the topic for 10 days. I have to do this for a particular topic only by Leaving all other topics TTL's the same, current configuration, I have to do this using java because I am pushing a topic to kafka through Java. I am setting following properties for pushing a topic to kafka

Properties props = new Properties();
props.put("bootstrap.servers", KAFKA_SERVERS);
props.put("acks", ACKS);
props.put("retries", RETRIES);
props.put("linger.ms", new Integer(LINGER_MS));
props.put("buffer.memory", new Integer(BUFFER_MEMORY));
props.put("key.serializer", "org.apache.kafka.common.serialization.StringSerializer");
props.put("value.serializer", "org.apache.kafka.common.serialization.StringSerializer");

Answer 1

You can do that using the AdminClient, following a snippet of code that get the current configuration (just for testing) and then update the "retention.ms" config on the topic named "test".

Properties props = new Properties();
props.put(AdminClientConfig.BOOTSTRAP_SERVERS_CONFIG, "localhost:9092");

AdminClient adminClient = AdminClient.create(props);

ConfigResource resource = new ConfigResource(ConfigResource.Type.TOPIC, "test");

// get the current topic configuration
DescribeConfigsResult describeConfigsResult  =
        adminClient.describeConfigs(Collections.singleton(resource));

Map<ConfigResource, Config> config = describeConfigsResult.all().get();

System.out.println(config);

// create a new entry for updating the retention.ms value on the same topic
ConfigEntry retentionEntry = new ConfigEntry(TopicConfig.RETENTION_MS_CONFIG, "50000");
Map<ConfigResource, Config> updateConfig = new HashMap<ConfigResource, Config>();
updateConfig.put(resource, new Config(Collections.singleton(retentionEntry)));

AlterConfigsResult alterConfigsResult = adminClient.alterConfigs(updateConfig);
alterConfigsResult.all();

describeConfigsResult  = adminClient.describeConfigs(Collections.singleton(resource));

config = describeConfigsResult.all().get();

System.out.println(config);

adminClient.close();