·
STAND ALONE
· PSEUDO DISTRIBUTED
· FULLY DISTRIBUTED (Cluster)
The STAND ALONE and PSEUDO DISTRIBUTED modes of operations are
development modes of operations used by development teams to carry out
development of Map Reduce jobs.
The stand-alone mode of development does not use HDFS but uses
local operating system files system. Hadoop and all application code runs
inside a single Java process. This is on a Single machine.
The pseudo – distributed mode of Hadoop runs all the processes
like Name node, Data node, Job Tracker and Task Tracker as separate processes.
HDFS file system is used in this mode of operation. This is again on a single
machine.
Both the above approaches are used by developers to carry out
development activities.
The third mode of Hadoop operation is FULLY DISTRIBUTED Cluster.
HDFS file system is used. This is over a cluster of machines. Read / write
processes are balanced over a cluster of nodes. There are several
daemon threads of Name node, Data node, Task Tracker and Job Tracker.
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