Contents What is Hadoop. Why do we need Hadoop. How Hadoop works. HDFS Architecture. What is Map – Reduce. Hadoop Cluster. Hadoop Processes. Topology of a Hadoop Cluster. Distinction of Hadoop Framework . Prerequisites to learn hadoop.
What is Hadoop Hadoop is an open Source Framework. Developed by Apache Software Foundation. Used for distributed processing of large datesets. It works across clusters of computers using asimple programming model (Map-Reduce).
Why do we need Hadoop Data is growing faster. Need to process multi petabytes of data. The performance of traditional applicationsis decreasing. The number of machines in a cluster is notconstant. Failure is expected, rather than exceptional.
How Hadoop Works The Hadoop core consists of two modules : Hadoop Distributed File System (HDFS)[Storage]. Map Reduce [Processing].MapperReducer
What is Map – Reduce Map Reduce plays a key role in hadoop framework. Map Reduce is a Programming model for writingapplications that rapidly process large amount ofdata. Mapper – is a function that processes input data togenerate intermediate output data. Reducer – Merges all intermediate data from allmappers and generate final output data.
Hadoop Cluster A Hadoop Cluster consist of multiplemachines Which can be classified into 3types Namenode Secondary Namenode Datanode
Hadoop Processes Below are the daemons (Processes) Whichruns in a cluster.Name node (Runs on a master machine)Job Tracker (Runs on a master machine)Data node (Runs on slave machines)Task Tracker (Runs on slave machines)
Distinction Simple – Hadoop allows users to quicklywrite efficient parallel code. Reliable – Because Hadoop runs oncommodity hardware, it can face frequentautomatically handle such failures. Scalable – we can increase or decrease thenumber of nodes (machine) in hadoopcluster.
Prerequisites Linux bases operating system (Mac OS, Redhat,ubuntu) Java 1.6 or higher version Disk space ( To hold HDFS data and it’sreplications ) Ram (Recommended 2GB) A cluster of computers. You can even install Hadoop on single machine. For more information visit this link: hadoop onlinetraining
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