Error reading field 'topic_metadata' in Kafka - apache-kafka

Question

I am trying to connect to my broker on aws with auto.create.topics.enable=true in my server.properties file. But when I am trying to connect to broker using Java client producer I am getting the following error.
1197 [kafka-producer-network-thread | producer-1] ERROR
org.apache.kafka.clients.producer.internals.Sender - Uncaught error in
kafka producer I/O thread:
org.apache.kafka.common.protocol.types.SchemaException: Error reading
field 'topic_metadata': Error reading array of size 619631, only 37
bytes available at
org.apache.kafka.common.protocol.types.Schema.read(Schema.java:73) at
org.apache.kafka.clients.NetworkClient.parseResponse(NetworkClient.java:380)
at
org.apache.kafka.clients.NetworkClient.handleCompletedReceives(NetworkClient.java:449)
at
org.apache.kafka.clients.NetworkClient.poll(NetworkClient.java:269)
at
org.apache.kafka.clients.producer.internals.Sender.run(Sender.java:229)
at
org.apache.kafka.clients.producer.internals.Sender.run(Sender.java:134)
at java.lang.Thread.run(Unknown Source)
Following is my Client producer code.
public static void main(String[] argv){
Properties props = new Properties();
props.put("bootstrap.servers", "http://XX.XX.XX.XX:9092");
props.put("acks", "all");
props.put("retries", 0);
props.put("batch.size", 16384);
props.put("linger.ms", 0);
props.put("buffer.memory", 33554432);
props.put("key.serializer", "org.apache.kafka.common.serialization.StringSerializer");
props.put("value.serializer", "org.apache.kafka.common.serialization.StringSerializer");
props.put("block.on.buffer.full",true);
Producer<String, String> producer = new KafkaProducer<String, String>(props);
try{ for(int i = 0; i < 10; i++)
{ producer.send(new ProducerRecord<String, String>("topicjava", Integer.toString(i), Integer.toString(i)));
System.out.println("Tried sending:"+i);}
}
catch (Exception e){
e.printStackTrace();
}
producer.close();
}
Can someone help me resolve this?

Answer 1

I have faced the similar issue. The problem here is, when there is a mismatch between kafka clients version in pom file and kafka server is different.
I was using kafka clients 0.10.0.0_1 but the kafka server was still in 0.9.0.0. So i upgraded the kafka server version to 10 the issue got resolved.
<dependency>
<groupId>org.apache.servicemix.bundles</groupId>
<artifactId>org.apache.servicemix.bundles.kafka-clients</artifactId>
<version>0.10.0.0_1</version>
</dependency>

Answer 2

Looks like I was setting wrong properties at the client side also my server.properties file had properties which were not meant for the client I was using.So I decided to change the java client to version 0.9.0 using maven.
<dependency>
<groupId>org.apache.kafka</groupId>
<artifactId>kafka_2.11</artifactId>
<version>0.9.0.0</version>
</dependency>
my server.properties file is as below.
broker.id=0
port=9092
num.network.threads=3
num.io.threads=8
socket.send.buffer.bytes=102400
socket.receive.buffer.bytes=102400
socket.request.max.bytes=104857600
log.dirs=/tmp/kafka-logs
num.partitions=1
num.recovery.threads.per.data.dir=1
log.segment.bytes=1073741824
log.retention.check.interval.ms=300000
log.cleaner.enable=false
zookeeper.connect=localhost:2181
zookeeper.connection.timeout.ms=9000
delete.topic.enable=true
advertised.host.name=<aws public Ip>
advertised.port=9092
My producer code looks like
import java.util.Properties;
import java.util.concurrent.ExecutionException;
import org.apache.kafka.clients.producer.KafkaProducer;
import org.apache.kafka.clients.producer.ProducerConfig;
import org.apache.kafka.clients.producer.ProducerRecord;
import org.apache.kafka.common.serialization.StringSerializer;
public class HelloKafkaProducer
{
public static void main(String args[]) throws InterruptedException, ExecutionException {
Properties props = new Properties();
props.put(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG,"IP:9092");
props.put(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG,StringSerializer.class.getName());
props.put(ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG,StringSerializer.class.getName());
KafkaProducer<String,String> producer = new KafkaProducer<String,String>(props);
boolean sync = false;
String topic="loader1";
String key = "mykey";
for(int i=0;i<1000;i++)
{
String value = "myvaluehasbeensent"+i+i;
ProducerRecord<String,String> producerRecord = new ProducerRecord<String,String>(topic, key, value);
if (sync) {
producer.send(producerRecord).get();
} else {
producer.send(producerRecord);
}
}
producer.close();
}
}

Answer 3

Make sure that you use the correct versions. Lets say you use following maven dependecy:
<dependency>
<groupId>org.apache.flink</groupId>
<artifactId>flink-connector-kafka-0.8_2.10</artifactId>
<version>${flink.version}</version>
</dependency>
So the artifact equals: flink-connector-kafka-0.8_2.10
Now check if you use the correct Kafka version:
cd /KAFKA_HOME/libs
Now find kafka_YOUR-VERSION-sources.jar.
In my case I have kafka_2.10-0.8.2.1-sources.jar. So it works fine! :)
If you use different versions, just change maven dependecies OR download the correct kafka version.

Answer 4

I solved this problem by editing
/etc/hosts file
Check your hosts file that if zookeeper or other brokers's ip are not in this file .