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  1. Appendix A: Glossary

Hadoop cluster

Hadoop cluster

A cluster of machines that is configured to run Hadoop applications and services. A typical Hadoop cluster includes a master node and several worker nodes. The master node runs the master daemons JobTracker and NameNode. A worker node runs the DataNode and TaskTracker daemons. In small clusters, the master node may also run the worker daemons.

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