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Posted to jira@kafka.apache.org by "Pascal Rodriguez (Jira)" <ji...@apache.org> on 2020/03/02 10:14:00 UTC
[jira] [Commented] (KAFKA-9504) Memory leak in KafkaMetrics
registered to MBean
[ https://issues.apache.org/jira/browse/KAFKA-9504?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17048994#comment-17048994 ]
Pascal Rodriguez commented on KAFKA-9504:
-----------------------------------------
It seems related to https://issues.apache.org/jira/browse/KAFKA-9306
> Memory leak in KafkaMetrics registered to MBean
> -----------------------------------------------
>
> Key: KAFKA-9504
> URL: https://issues.apache.org/jira/browse/KAFKA-9504
> Project: Kafka
> Issue Type: Bug
> Components: clients
> Affects Versions: 2.4.0
> Reporter: Andreas Holmén
> Priority: Major
>
> After close() called on a KafkaConsumer some registered MBeans are not unregistered causing leak.
>
>
> {code:java}
> import static org.apache.kafka.clients.consumer.ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG;
> import java.lang.management.ManagementFactory;
> import java.util.HashMap;
> import java.util.Map;
> import javax.management.MBeanServer;
> import org.apache.kafka.clients.consumer.KafkaConsumer;
> import org.apache.kafka.common.serialization.ByteArrayDeserializer;
> public class Leaker {
> private static String bootstrapServers = "hostname:9092";
>
> public static void main(String[] args) throws InterruptedException {
> MBeanServer mBeanServer = ManagementFactory.getPlatformMBeanServer();
> Map<String, Object> props = new HashMap<>();
> props.put(BOOTSTRAP_SERVERS_CONFIG, bootstrapServers);
>
> int beans = mBeanServer.getMBeanCount();
> for (int i = 0; i < 100; i++) {
> KafkaConsumer<byte[], byte[]> consumer = new KafkaConsumer<>(props, new ByteArrayDeserializer(), new ByteArrayDeserializer());
> consumer.close();
> }
> int newBeans = mBeanServer.getMBeanCount();
> System.out.println("\nbeans delta: " + (newBeans - beans));
> }
> }
> {code}
>
>
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