Friday, 8 March 2013

How many daemon processes run on a Hadoop cluster?


Hadoop is comprised of five separate daemons. Each of these daemons runs in its own JVM.
Following 3 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. Following 2 Daemons run on each Slave nodes DataNode – Stores actual HDFS data blocks.

TaskTracker – It is Responsible for instantiating and monitoring individual Map and Reduce tasks.
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23 comments:

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