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when Consumer Api run I have facing these exception...please anybody help me out

Exception in thread "main" kafka.common.ConsumerRebalanceFailedException: 0_VISION-PC-1373267495173-8bbf746b can't rebalance after 4 retries
at kafka.consumer.ZookeeperConsumerConnector$ZKRebalancerListener.syncedRebalance(ZookeeperConsumerConnector.scala:397)
at kafka.consumer.ZookeeperConsumerConnector.kafka$consumer$ZookeeperConsumerConnector$$reinitializeConsumer(ZookeeperConsumerConnector.scala:681)
at kafka.consumer.ZookeeperConsumerConnector.consume(ZookeeperConsumerConnector.scala:205)
at kafka.javaapi.consumer.ZookeeperConsumerConnector.createMessageStreams(ZookeeperConsumerConnector.scala:77)
at kafka.javaapi.consumer.ZookeeperConsumerConnector.createMessageStreams(ZookeeperConsumerConnector.scala:89)
at Hello.Consumer.run(Consumer.java:40)
at Hello.Consumer.main(Consumer.java:84)

my source code for consumer class is....

package Hello;
import kafka.consumer.ConsumerConfig;
import kafka.consumer.ConsumerIterator;
import kafka.consumer.KafkaStream;
import kafka.javaapi.consumer.ConsumerConnector;
import kafka.message.Message;

import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Properties;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

public class Consumer

{
private final ConsumerConnector consumer;
private final String topic;
public Consumer(String a_zookeeper, String a_groupId, String a_topic)

Unknown macro: { consumer = kafka.consumer.Consumer.createJavaConsumerConnector( createConsumerConfig(a_zookeeper, a_groupId)); this.topic = a_topic; }

public void run(int a_numThreads) {
Map<String, Integer> topicCountMap = new HashMap<String, Integer>();
topicCountMap.put(topic, new Integer(1));

topicCountMap.put(topic, new Integer(1));
/* consumerMap = consumer.createMessageStreams(topicCountMap);
stream = consumerMap.get(topic).get(0);*/
System.out.println("before map");
Map<String, List<KafkaStream<byte[], byte[]>>> consumerMap = new HashMap<String, List<KafkaStream<byte[], byte[]>>>();

consumerMap=consumer.createMessageStreams(topicCountMap);
KafkaStream<byte[],byte[]> stream = consumerMap.get(topic).get(0);
ConsumerIterator<byte[], byte[]> it = stream.iterator();
while(it.hasNext())

Unknown macro: { System.out.println(new String(it.next().message())); }

consumer.shutdown();

}

private static ConsumerConfig createConsumerConfig(String a_zookeeper, String a_groupId)

Unknown macro: { Properties props = new Properties(); props.put("zookeeper.connect", "10.36.76.185}

public static void main(String[] args) {
String zooKeeper = "10.36.76.185:2181";
String groupId = "0";
String topic = "test";
int threads = 1;//Integer.parseInt(args[3])

Consumer consumer = new Consumer(zooKeeper, groupId, topic);
consumer.run(threads);

try

Unknown macro: { Thread.sleep(10000); }

catch (InterruptedException ie) {

}

}

}

How to measure performance of zookeeper

i just want to know what are the performance metrics of zookeeper and how to measure performance of zookeeper. Kindly share youre references with me . Also If some performance testing code is there kindly share with me at chandanbagai2507@rediffmail.com

Thanks and Regards
Chandan bagai