Hadoop’s architecture O.X and 1.X
NameNode
• Master of HDFS, directs the slave DataNode daemons to perform low-level I/O tasks
• Keeps track of file splitting into blocks, replication, block location, etc.
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Secondary NameNode: takes snapshots of the NameNode.
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DataNode: each slave machine hosts a DataNode daemon.
NameNodes and DataNodes
Hadoop Cluster Topology
