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It is a process of storing and processing huge amount of data in clusters .
each block in hadoop is stored as 64MB, built on file system.
HDFS: process of storing data.
Map Reduce: Processing technique used on HFDS.
HDFS:
It has 5services:
NodeName
secondary Node Name
Job Tracker
Data Node
Task Tracker
Top three services are master, while the next 2 services are slave services.
Master services can talk to each other and slave services can also talk to each other.
And Node Name is allowed to talk to Data Node alone and vice versa
While Job tracker is allowed to talk to tasktracker alone.
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