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　Run first Kafka application -- Kafka inside (2)

start zookeeper:


bin/zookeeper-server-start.sh config/zookeeper.properties


start kafka server:


bin/kafka-server-start.sh config/server.properties

run the demo:

a. For unlimited sync-producer-consumer run, `run bin/java-producer-consumer-demo.sh sync`
b. For unlimited async-producer-consumer run, `run bin/java-producer-consumer-demo.sh`adf

Let's take a look the source code java-producer-consumer-demo.sh,.
the script is mainly use kafka.examples.KafkaConsumerProducerDemo as the demo class.

the code created 2 topics(queues) for produce and consumer.

the time to dig into code step by step.


Firstly, take a look at source code of Producer
Producer created messages and send to kafka server.
on line 53, KafkaProducer send the message with callback : ProducerRecord
Per each message, the topic, messgeNo and messager body are defined.

DemoCallBack provide asynchronous handling of request completion.
here, DemoCallBack just print the message when completing send the message.


The Consumer class will poll the data every one second and print the message.
all producerRecord and Consume inherited from Bean.

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