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Typical Cell Layout<br />
▪ Multiple cells for messaging<br />
▪ 20 servers/rack; 5 or more racks per cluster<br />
▪ Controllers (master/Zookeeper) spread across racks<br />
ZooKeeper<br />
HDFS NameNode<br />
Region Server<br />
D<strong>at</strong>a Node<br />
Task Tracker<br />
Rack #1<br />
Region Server<br />
D<strong>at</strong>a Node<br />
Task Tracker<br />
Region Server<br />
D<strong>at</strong>a Node<br />
Task Tracker<br />
Region Server<br />
D<strong>at</strong>a Node<br />
Task Tracker<br />
Region Server<br />
D<strong>at</strong>a Node<br />
Task Tracker<br />
19x... 19x... 19x... 19x... 19x...<br />
Region Server<br />
D<strong>at</strong>a Node<br />
Task Tracker<br />
ZooKeeper<br />
Backup NameNode<br />
Region Server<br />
D<strong>at</strong>a Node<br />
Task Tracker<br />
ZooKeeper<br />
Job Tracker<br />
Region Server<br />
D<strong>at</strong>a Node<br />
Task Tracker<br />
ZooKeeper<br />
HBase Master<br />
Region Server<br />
D<strong>at</strong>a Node<br />
Task Tracker<br />
ZooKeeper<br />
Backup Master<br />
Region Server<br />
D<strong>at</strong>a Node<br />
Task Tracker<br />
Rack #2 Rack #3 Rack #4 Rack #5
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