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Hadoop modes

Standalone (or local) mode:
F    Default mode.
F   You don’t configure anything else.
F    NameNode, DataNode, JobTracker and TaskTracker,run in a single Java process. 
Pseudo-distributed mode:
 A separate JVM is spawned for each of the Hadoop components and they communicate across network sockets, effectively giving a fully functioning mini cluster on a single host. 
Fully distributed mode :
   Spread across multiple machines, some of which will be general-purpose workers and others will be dedicated hosts for components, such as NameNode and JobTracker.
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