4. Start ZooKeeper

In order to install and configure HBase and other Hadoop ecosystem components, you must start the ZooKeeper service:

su - zookeeper -c 'source /etc/zookeeper/conf/zookeeper-env.sh ; export 
ZOOCFGDIR=/etc/zookeeper/conf;/usr/lib/zookeeper/bin/zkServer.sh start >> /var/log/zookeeper/zoo.out 2>&1'

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