The group coordinator is not available-Kafka

Question

When I am write a topic to kafka,there is an error:Offset commit failed:

2016-10-29 14:52:56.387 INFO [nioEventLoopGroup-3-1][org.apache.kafka.common.utils.AppInfoParser$AppInfo:82] - Kafka version : 0.9.0.1
2016-10-29 14:52:56.387 INFO [nioEventLoopGroup-3-1][org.apache.kafka.common.utils.AppInfoParser$AppInfo:83] - Kafka commitId : 23c69d62a0cabf06
2016-10-29 14:52:56.409 ERROR [nioEventLoopGroup-3-1][org.apache.kafka.clients.consumer.internals.ConsumerCoordinator$DefaultOffsetCommitCallback:489] - Offset commit failed.
org.apache.kafka.common.errors.GroupCoordinatorNotAvailableException: The group coordinator is not available.
2016-10-29 14:52:56.519 WARN [kafka-producer-network-thread | producer-1][org.apache.kafka.clients.NetworkClient$DefaultMetadataUpdater:582] - Error while fetching metadata with correlation id 0 : {0085000=LEADER_NOT_AVAILABLE}
2016-10-29 14:52:56.612 WARN [pool-6-thread-1][org.apache.kafka.clients.NetworkClient$DefaultMetadataUpdater:582] - Error while fetching metadata with correlation id 1 : {0085000=LEADER_NOT_AVAILABLE}

When create a new topic using command,it is ok.

./kafka-topics.sh --zookeeper localhost:2181 --create --topic test1 --partitions 1 --replication-factor 1 --config max.message.bytes=64000 --config flush.messages=1

This is the producer code using Java：

public void create() {
        Properties props = new Properties();
        props.clear();
        String producerServer = PropertyReadHelper.properties.getProperty("kafka.producer.bootstrap.servers");
        String zookeeperConnect = PropertyReadHelper.properties.getProperty("kafka.producer.zookeeper.connect");
        String metaBrokerList = PropertyReadHelper.properties.getProperty("kafka.metadata.broker.list");
        props.put("bootstrap.servers", producerServer);
        props.put("zookeeper.connect", zookeeperConnect);//声明ZooKeeper
        props.put("metadata.broker.list", metaBrokerList);//声明kafka broker
        props.put("acks", "all");
        props.put("retries", 0);
        props.put("batch.size", 1000);
        props.put("linger.ms", 10000);
        props.put("buffer.memory", 10000);
        props.put("key.serializer", "org.apache.kafka.common.serialization.StringSerializer");
        props.put("value.serializer", "org.apache.kafka.common.serialization.StringSerializer");
        producer = new KafkaProducer<String, String>(props);
    }

Where is wrong？

Answer 1

I faced a similar issue. The problem was when you start your Kafka broker there is a property associated with it, "KAFKA_OFFSETS_TOPIC_REPLICATION_FACTOR". If you are working with a single node cluster make sure you set this property with the value '1'. As its default value is 3. This change resolved my problem. (you can check the value in Kafka.properties file) Note: I was using base image of confluent kafka version 4.0.0 ( confluentinc/cp-kafka:4.0.0)

Answer 2

Looking at your logs the problem is that cluster probably don't have connection to node which is the only one know replica of given topic in zookeeper.

You can check it using given command:
kafka-topics.sh --describe --zookeeper localhost:2181 --topic test1

or using kafkacat:
kafkacat -L -b localhost:9092

Example result:

Metadata for all topics (from broker 1003: localhost:9092/1003):
 1 brokers:
  broker 1003 at localhost:9092
 1 topics:
  topic "topic1" with 1 partitions:
    partition 0, leader -1, replicas: 1001, isrs: , Broker: Leader not available

If you have single node cluster then broker id(1001) should match leader of topic1 partition.
But as you can see the only one known replica of topic1 was 1001 - which is not available now, so there is no possibility to recreate topic on different node.

The source of the problem can be an automatic generation of broker id(if you don't have specified broker.id or it is set to -1).
Then on starting the broker(the same single broker) you probably receive broker id different that previously and different than was marked in zookeeper (this a reason why partition deletion can help - but it is not a production solution).

The solution may be setting broker.id value in node config to fixed value - according to documentation it should be done on produciton environment:
broker.id=1

If everything is alright you should receive sth like this:

Metadata for all topics (from broker 1: localhost:9092/1001):
 1 brokers:
  broker 1 at localhost:9092
 1 topics:
  topic "topic1" with 1 partitions:
    partition 0, leader 1, replicas: 1, isrs: 1

Kafka Documentation: https://kafka.apache.org/documentation/#prodconfig

Answer 3

Hi you have to keep your kafka replicas and replication factor for your code same.

for me i keep 3 as replicas and 3 as replication factor.