What is ?
Hadoop is a framework for running applications on large clusters
built of commodity hardware.
Hadoop is a free, Java-based programming framework that
supports the processing of large data sets in a distributed
4. Introduction (conti..)
#1 Open Source
#2 Part of Apache group
#3 Power of JAVA
#4 Supported By Big Web Giant Companies
#1 Google’s Powerful Computation MapReduce Technology
#2 Hadoop Distributed File System(HDFS) inspired by Google File
#3 Used for Cluster & Distributed Computing
#4 Support from…
Inventor Doug Cutting, creator of Apache Lucene
The Origin of the Name “Hadoop”:
The name my kid gave a stuffed yellow elephant. Short, relatively easy to
spell and pronounce, meaningless, and not used elsewhere: those are my
naming criteria. ---Daug Cutting.
Started with building Web Search Engine
•Nutch in 2002
•Aim was to index billions of pages
•Architecture can’t support billions of pages
Google’s GFS in 2003 solved storage problem
•Nutch Distributed Filesystem(NDFS) in 2004
Google’s MapReduce in 2004
•MapReduce implimented in Nutch 2005
Feb 2006 they moved out of Nutch to form an independent
subproject of Lucene called Hadoop.
6. History (conti..)
At around the same time, Doug Cutting joined Yahoo
February 2008 , Yahoo! announced that its production search index
was being generated by a 10,000-core Hadoop cluster
In January 2008, Hadoop was made its own top-level project at
apache, confirming its success and its diverse, active community.
By this time Hadoop was being used by many other companies
besides Yahoo! such as
• The New York Times
7. Key Technologies:
-Computational Parallel Programming Model
-Technology developed by google
•Hadoop Distributed File System
-Distributed File System for large data set
-Inspired by Google File System
9. Key Technologies: MapReduce
• Programming model developed at Google
• Sort/merge based distributed computing
• Initially, it was intended for their internal search/indexing
application, but now used extensively by more organizations
(e.g., Yahoo, Amazon.com, IBM, etc.)
• It is functional style programming (e.g., LISP) that is naturally
parallelizable across a large cluster of workstations or PCS.
• The underlying system takes care of the partitioning of the
input data, scheduling the program’s execution across several
machines, handling machine failures, and managing required
inter-machine communication. (This is the key for Hadoop’s
10. Key Technologies: HDFS
At Google MapReduce operation are run on a special file system
called Google File System (GFS) that is highly optimized for this
GFS is not open source.
Doug Cutting and others at Yahoo! reverse engineered the GFS
and called it Hadoop Distributed File System (HDFS).
12. Key Technologies: HDFS
• Very Large Distributed File System
– 10K nodes, 100 million files, 10 PB
• Assumes Commodity Hardware
– Files are replicated to handle hardware failure
– Detect failures and recovers from them
• Optimized for Batch Processing
– Data locations exposed so that computations can move to
where data resides
– Provides very high aggregate bandwidth
• User Space, runs on heterogeneous OS
13. Other Projects on Hadoop:
ZooKeeper: co-ordination services
Pig: A high-level data-flow language and execution
framework for parallel computation.
Hive:A data warehouse infrastructure that provides
data summarization and ad hoc querying.
Chukwa: A data collection system for managing
large distributed systems.
14. Other Projects on Hadoop:
Avro: Apache Avro is a data serialization system.
•Rich data structures.
•A compact, fast, binary data format.
•A container file, to store persistent data.
•Simple integration with dynamic languages.
Just as Google's Bigtable leverages the
distributed data storage provided by the
Google File System, HBase provides
Bigtable-like capabilities on top of
Hadoop has been very effective solution for companies dealing
with the data in perabytes.
It has solved many problems in industry related to huge data
management and distributed system.
As it is open source, so it is adopted by companies widely.