Merge pull request #166 from hvivani/patch-2

Create readme.md

Author: stmcpherson

kafka/readme.md

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+Apache Kafka is publish-subscribe messaging system as a distributed commit log.
+
+A single Kafka broker can handle hundreds of megabytes of reads and writes per second from thousands of clients.
+
+It uses ZooKeeper so you need to first start a ZooKeeper server
+
+Bootstrap action for EMR 3.x:
+s3://support.elasticmapreduce/bootstrap-actions/other/kafka_install.rb
+
+To launch a cluster with Kafka installed using CLI Tools use the following command:
+aws emr create-cluster \ --ec2-attributes KeyName="<YOUR_EC2_KEYNAME>" \ --log-uri="<YOUR_LOGGING_BUCKET>" \ --bootstrap-action \ Name="Install Kafka",Path="s3://support.elasticmapreduce/bootstrap-actions/other/kafka_install.rb" \ --ami-version=3.9.0 \ --instance-count=3 \ --instance-type=m1.medium \ --name="TestKafka"
+
+Basic commands for Kafka:
+
+create topic (from master node):
+./kafka-topics.sh --create --zookeeper localhost:2181 --replication-factor 3 --partitions 1 --topic test
+
+list topics:
+./kafka-topics.sh --zookeeper localhost:2181 --list
+
+send a message (from master node):
+./kafka-console-producer.sh --broker-list localhost:9092 --topic test
+
+read messages from consumer (from slave node - change localhost by the master dns name):
+kafka-console-consumer.sh --zookeeper localhost:2181 --topic test --from-beginning