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How Many Daemon Processes Run On A Hadoop Cluster? |
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Answer» 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. 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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