1. Install Kafka

Prerequisites and Considerations

When installing Kafka, note the following prerequisites and considerations:

Administrators must use Apache Zookeeper to manage Kafka for an HDP cluster. Verify that you have successfully installed Zookeeper before installing and configuring Kafka.
Kafka does not currently support user authentication and authorization.
The following underlying file systems are supported for use with Kafka:
- EXT3: recommended
- EXT2
- EXT4: supported, but might have performance issues (see the "EXT4 Notes" section in Apache production system notes.
Caution
Encrypted file systems such as SafenetFS are not supported for Kafka. Index file corruption can occur.

	Caution
Encrypted file systems such as SafenetFS are not supported for Kafka. Index file corruption can occur.

Installation

Install the Kafka RPMs or packages by completing the following steps.

	Note
	Hortonworks recommends avoiding using multiple brokers in a single node for Kafka. However, if you need to install a multi-node cluster, use the following instructions to install Kafka on another machine, make sure each `broker.id` is unique on the cluster, and ensure that `zookeeper.connect` is the same for all brokers.

Run the following command on each client cluster node and gateway node:
- For RHEL/CentOS/Oracle Linux
  yum install kafka
- For SLES
  zypper install kafka
- For Ubuntu and Debian
  apt-get install kafka
Check the JAVA_HOME environment variable. If it has not yet been set, add the following to the PATH variable:
export JAVA_HOME=<path of installed jdk version folder>