io.confluent.kafka.formatter

Class AvroMessageReader

java.lang.Object

io.confluent.kafka.formatter.SchemaMessageReader<Object>

io.confluent.kafka.formatter.AvroMessageReader

All Implemented Interfaces:

Closeable, AutoCloseable, org.apache.kafka.common.Configurable, org.apache.kafka.tools.api.RecordReader

public class AvroMessageReader
extends SchemaMessageReader<Object>

Example To use AvroMessageReader, first make sure that Zookeeper, Kafka and schema registry server are all started. Second, make sure the jar for AvroMessageReader and its dependencies are included in the classpath of kafka-console-producer.sh. Then run the following command.

1. Send Avro string as value. (make sure there is no space in the schema string) bin/kafka-console-producer.sh --bootstrap-server localhost:9092 --topic t1 \ --line-reader io.confluent.kafka.formatter.AvroMessageReader \ --property schema.registry.url=http://localhost:8081 \ --property value.schema='{"type":"string"}'

In the shell, type in the following. "a" "b"

2. Send Avro record as value. bin/kafka-console-producer.sh --bootstrap-server localhost:9092 --topic t1 \ --line-reader io.confluent.kafka.formatter.AvroMessageReader \ --property schema.registry.url=http://localhost:8081 \ --property value.schema='{"type":"record","name":"myrecord","fields":[{"name":"f1","type":"string"}]}'

In the shell, type in the following. {"f1": "value1"}

3. Send Avro string as key and Avro record as value. bin/kafka-console-producer.sh --bootstrap-server localhost:9092 --topic t1 \ --line-reader io.confluent.kafka.formatter.AvroMessageReader \ --property schema.registry.url=http://localhost:8081 \ --property parse.key=true \ --property key.schema='{"type":"string"}' \ --property value.schema='{"type":"record","name":"myrecord","fields":[{"name":"f1","type":"string"}]}'

In the shell, type in the following. "key1" \t {"f1": "value1"}

Field Summary

Fields inherited from class io.confluent.kafka.formatter.SchemaMessageReader

KEY_SCHEMA, keySchema, VALUE_SCHEMA, valueSchema

Constructor Summary

Constructors

Constructor and Description
AvroMessageReader() Constructor needed by kafka console producer.

Method Summary

Modifier and Type	Method and Description
protected SchemaMessageSerializer<Object>	createSerializer(org.apache.kafka.common.serialization.Serializer keySerializer)
protected SchemaProvider	getProvider()
protected Object	readFrom(String jsonString, ParsedSchema parsedSchema)

Methods inherited from class io.confluent.kafka.formatter.SchemaMessageReader

close, configure, init, parseSchema, readRecords

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

AvroMessageReader

public AvroMessageReader()

Constructor needed by kafka console producer.

Method Detail

createSerializer

protected SchemaMessageSerializer<Object> createSerializer(org.apache.kafka.common.serialization.Serializer keySerializer)

Specified by:

createSerializer in class SchemaMessageReader<Object>

getProvider

protected SchemaProvider getProvider()

Specified by:

getProvider in class SchemaMessageReader<Object>

readFrom

protected Object readFrom(String jsonString,
                          ParsedSchema parsedSchema)

Specified by:

readFrom in class SchemaMessageReader<Object>