Kafka test

1. Cluster Setting
   
   1. setting zookeeper cluster
   2. process at each cluster node
   3. cd $KAFKA_HOME
   4. vim config/server.properties
   5. edit
      1. broker.id
   6. bin/kafka-server-start.sh config/server.properties & / sudo bin/kafka-server-start.sh -daemon config/test.properties &
2. Basic Test
   
   1. bin/kafka-topics.sh --create --zookeeper localhost:2181 --replication-factor 3 --partitions 1 --topic rep-test
   2. bin/kafka-topics.sh --list --zookeeper localhost:2181
   3. bin/kafka-topics.sh --describe --zookeeper localhost:2181 --topic rep-test
   4. bin/kafka-console-producer.sh --broker-list localhost:9092 --topic rep-test
      test 1
      test 2
      test 3
   5. bin/kafka-console-consumer.sh --zookeeper localhost:2181 --from-beginning --topic rep-test
3. Fault Tolerance Test
   
   1. kill the leader
   2. do the basic test again
   3. start the killed server again
   4. do the basic test again