[jira] [Created] (KAFKA-9504) Memory leak in KafkaMetrics registered to MBean

["Andreas Holmén (Jira)" <ji...@apache.org>]

Andreas Holmén created KAFKA-9504:
-------------------------------------

             Summary: 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


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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