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The "PseudoDistributedHadoop" page has been changed by SteveLoughran: http://wiki.apache.org/hadoop/PseudoDistributedHadoop?action=diff&rev1=4&rev2=5 - Pseudo Distributed Hadoop is where Hadoop runs as set of independent JVMs, but only on a single host, listening only on the "localhost" ports. + Pseudo Distributed Hadoop is where Hadoop runs as set of independent JVMs, but only on a single host. It has much lower performance than a real Hadoop cluster, due to the smaller number of hard disks limiting IO bandwidth. It is, however, a good way to play with new MR algorithms on very small datasets, and to learn how to use Hadoop. Developers working in the Hadoop codebase usually test their code in this mode before deploying their build of Hadoop to a local test cluster. If you are running in this mode (and don't have a proxy server fielding HTML requests), and have not changed the default port values, then both the NameNode and JobTracker can be reached from this page
