Hadoop is comprised of five separate daemons. Each of these daemon runs in its own JVM.
Daemons run on Master nodes:
NameNode – This daemon stores and maintains the metadata for HDFS.Secondary NameNode – Performs housekeeping functions for the NameNode.
JobTracker – Manages MapReduce jobs, distributes individual tasks to machines running the Task Tracker.
Daemons run on Slave nodes:
DataNode – Stores actual HDFS data blocks.TaskTracker – Responsible for instantiating and monitoring individual Map and Reduce tasks.
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