Hadoop is an open source framework for distributed storage and processing of large datasets across commodity hardware. It has two main components - the Hadoop Distributed File System (HDFS) for storage, and MapReduce for processing. HDFS stores data across clusters in a redundant and fault-tolerant manner. MapReduce allows distributed processing of large datasets in parallel using map and reduce functions. The architecture aims to provide reliable, scalable computing using commodity hardware.
Hadoop Institutes : kelly technologies is the best Hadoop Training Institutes in Hyderabad. Providing Hadoop training by real time faculty in Hyderabad.
The document provides an introduction to Hadoop, including an overview of its core components HDFS and MapReduce, and motivates their use by explaining the need to process large amounts of data in parallel across clusters of computers in a fault-tolerant and scalable manner. It also presents sample code walkthroughs and discusses the Hadoop ecosystem of related projects like Pig, HBase, Hive and Zookeeper.
Distributed Computing with Apache Hadoop is a technology overview that discusses:
1) Hadoop is an open source software framework for distributed storage and processing of large datasets across clusters of commodity hardware.
2) Hadoop addresses limitations of traditional distributed computing with an architecture that scales linearly by adding more nodes, moves computation to data instead of moving data, and provides reliability even when hardware failures occur.
3) Core Hadoop components include the Hadoop Distributed File System for storage, and MapReduce for distributed processing of large datasets in parallel on multiple machines.
The Hadoop Distributed File System (HDFS) is the primary data storage system used by Hadoop applications. It employs a Master and Slave architecture with a NameNode that manages metadata and DataNodes that store data blocks. The NameNode tracks locations of data blocks and regulates access to files, while DataNodes store file blocks and manage read/write operations as directed by the NameNode. HDFS provides high-performance, scalable access to data across large Hadoop clusters.
Hadoop is a distributed processing framework for large datasets. It stores data across clusters of commodity hardware in a Hadoop Distributed File System (HDFS) and provides tools for distributed processing using MapReduce. HDFS uses a master-slave architecture with a namenode managing metadata and datanodes storing data blocks. Data is replicated across nodes for reliability. MapReduce allows distributed processing of large datasets in parallel across clusters.
More about Hadoop
www.beinghadoop.com
https://www.facebook.com/hadoopinfo
This PPT Gives information about
Complete Hadoop Architecture and
information about
how user request is processed in Hadoop?
About Namenode
Datanode
jobtracker
tasktracker
Hadoop installation Post Configurations
This document provides an overview of Hadoop and its core components. Hadoop is an open-source software framework for distributed storage and processing of large datasets across clusters of computers. It uses MapReduce as its programming model and the Hadoop Distributed File System (HDFS) for storage. HDFS stores data redundantly across nodes for reliability. The core subprojects of Hadoop include MapReduce, HDFS, Hive, HBase, and others.
HDFS is a Java-based file system that provides scalable and reliable data storage, and it was designed to span large clusters of commodity servers. HDFS has demonstrated production scalability of up to 200 PB of storage and a single cluster of 4500 servers, supporting close to a billion files and blocks.
Hadoop Institutes : kelly technologies is the best Hadoop Training Institutes in Hyderabad. Providing Hadoop training by real time faculty in Hyderabad.
The document provides an introduction to Hadoop, including an overview of its core components HDFS and MapReduce, and motivates their use by explaining the need to process large amounts of data in parallel across clusters of computers in a fault-tolerant and scalable manner. It also presents sample code walkthroughs and discusses the Hadoop ecosystem of related projects like Pig, HBase, Hive and Zookeeper.
Distributed Computing with Apache Hadoop is a technology overview that discusses:
1) Hadoop is an open source software framework for distributed storage and processing of large datasets across clusters of commodity hardware.
2) Hadoop addresses limitations of traditional distributed computing with an architecture that scales linearly by adding more nodes, moves computation to data instead of moving data, and provides reliability even when hardware failures occur.
3) Core Hadoop components include the Hadoop Distributed File System for storage, and MapReduce for distributed processing of large datasets in parallel on multiple machines.
The Hadoop Distributed File System (HDFS) is the primary data storage system used by Hadoop applications. It employs a Master and Slave architecture with a NameNode that manages metadata and DataNodes that store data blocks. The NameNode tracks locations of data blocks and regulates access to files, while DataNodes store file blocks and manage read/write operations as directed by the NameNode. HDFS provides high-performance, scalable access to data across large Hadoop clusters.
Hadoop is a distributed processing framework for large datasets. It stores data across clusters of commodity hardware in a Hadoop Distributed File System (HDFS) and provides tools for distributed processing using MapReduce. HDFS uses a master-slave architecture with a namenode managing metadata and datanodes storing data blocks. Data is replicated across nodes for reliability. MapReduce allows distributed processing of large datasets in parallel across clusters.
More about Hadoop
www.beinghadoop.com
https://www.facebook.com/hadoopinfo
This PPT Gives information about
Complete Hadoop Architecture and
information about
how user request is processed in Hadoop?
About Namenode
Datanode
jobtracker
tasktracker
Hadoop installation Post Configurations
This document provides an overview of Hadoop and its core components. Hadoop is an open-source software framework for distributed storage and processing of large datasets across clusters of computers. It uses MapReduce as its programming model and the Hadoop Distributed File System (HDFS) for storage. HDFS stores data redundantly across nodes for reliability. The core subprojects of Hadoop include MapReduce, HDFS, Hive, HBase, and others.
HDFS is a Java-based file system that provides scalable and reliable data storage, and it was designed to span large clusters of commodity servers. HDFS has demonstrated production scalability of up to 200 PB of storage and a single cluster of 4500 servers, supporting close to a billion files and blocks.
The document summarizes Apache Hadoop, an open-source software framework for distributed storage and processing of large datasets across clusters of computers. It describes the key components of Hadoop including the Hadoop Distributed File System (HDFS) which stores data reliably across commodity hardware, and the MapReduce programming model which allows distributed processing of large datasets in parallel. The document provides an overview of HDFS architecture, data flow, fault tolerance, and other aspects to enable reliable storage and access of very large files across clusters.
Hadoop Distributed File System (HDFS) is a distributed file system that stores large datasets across commodity hardware. It is highly fault tolerant, provides high throughput, and is suitable for applications with large datasets. HDFS uses a master/slave architecture where a NameNode manages the file system namespace and DataNodes store data blocks. The NameNode ensures data replication across DataNodes for reliability. HDFS is optimized for batch processing workloads where computations are moved to nodes storing data blocks.
Hadoop is an open source framework for running large-scale data processing jobs across clusters of computers. It has two main components: HDFS for reliable storage and Hadoop MapReduce for distributed processing. HDFS stores large files across nodes through replication and uses a master-slave architecture. MapReduce allows users to write map and reduce functions to process large datasets in parallel and generate results. Hadoop has seen widespread adoption for processing massive datasets due to its scalability, reliability and ease of use.
HDFS stores files as blocks that are by default 64 MB in size to minimize disk seek times. The namenode manages the file system namespace and metadata, tracking which datanodes store each block. When writing a file, HDFS breaks it into blocks and replicates each block across multiple datanodes. The secondary namenode periodically merges namespace and edit log changes to prevent the log from growing too large. Small files are inefficient in HDFS due to each file requiring namespace metadata regardless of size.
Presentation on 2013-06-27, Workshop on the future of Big Data management, discussing hadoop for a science audience that are either HPC/grid users or people suddenly discovering that their data is accruing towards PB.
The other talks were on GPFS, LustreFS and Ceph, so rather than just do beauty-contest slides, I decided to raise the question of "what is a filesystem?", whether the constraints imposed by the Unix metaphor and API are becoming limits on scale and parallelism (both technically and, for GPFS and Lustre Enterprise in cost).
Then: HDFS as the foundation for the Hadoop stack.
All the other FS talks did emphasise their Hadoop integration, with the Intel talk doing the most to assert performance improvements of LustreFS over HDFSv1 in dfsIO and Terasort (no gridmix?), which showed something important: Hadoop is the application that add DFS developers have to have a story for
This document provides an overview and introduction to Hadoop, HDFS, and MapReduce. It covers the basic concepts of HDFS, including how files are stored in blocks across data nodes, and the role of the name node and data nodes. It also explains the MapReduce programming model, including the mapper, reducer, and how jobs are split into parallel tasks. The document discusses using Hadoop from the command line and writing MapReduce jobs in Java. It also mentions some other projects in the Hadoop ecosystem like Pig, Hive, HBase and Zookeeper.
This document provides an overview of Hadoop, including its architecture, installation, configuration, and commands. It describes the challenges of large-scale data that Hadoop addresses through distributed processing and storage across clusters. The key components of Hadoop are HDFS for storage and MapReduce for distributed processing. HDFS stores data across clusters and provides fault tolerance through replication, while MapReduce allows parallel processing of large datasets through a map and reduce programming model. The document also outlines how to install and configure Hadoop in pseudo-distributed and fully distributed modes.
Hadoop Interview Questions and Answers by rohit kapakapa rohit
Hadoop Interview Questions and Answers - More than 130 real time questions and answers covering hadoop hdfs,mapreduce and administrative concepts by rohit kapa
There's a big shift in both at the architecture and api level from Hadoop 1 vs Hadoop 2, particularly YARN and we had our first meetup to talk about this (http://www.meetup.com/Atlanta-YARN-User-Group/) on 10/13/2013.
Hadoop is an open source framework for distributed storage and processing of large datasets across clusters of commodity hardware. It uses Google's MapReduce programming model and Google File System for reliability. The Hadoop architecture includes a distributed file system (HDFS) that stores data across clusters and a job scheduling and resource management framework (YARN) that allows distributed processing of large datasets in parallel. Key components include the NameNode, DataNodes, ResourceManager and NodeManagers. Hadoop provides reliability through replication of data blocks and automatic recovery from failures.
Hadoop is an open-source software framework for distributed storage and processing of large datasets across clusters of computers. It uses HDFS for data storage and MapReduce as a programming model for distributed computing. HDFS stores data reliably across machines in a Hadoop cluster as blocks and achieves high fault tolerance through replication. MapReduce allows processing of large datasets in parallel by dividing the work into independent tasks called Maps and Reduces. Hadoop has seen widespread adoption for applications involving massive datasets and is used by companies like Yahoo!, Facebook and Amazon.
This document provides an overview of HDFS and MapReduce. It discusses the core components of Hadoop including HDFS, the namenode, datanodes, and MapReduce components like the JobTracker and TaskTracker. It then covers HDFS topics such as the storage hierarchy, file reads and writes, blocks, and basic filesystem operations. It also summarizes MapReduce concepts like the inspiration from functional programming, the basic MapReduce flow, and example code for a word count problem.
This document provides an overview of Hadoop and MapReduce. It discusses how Hadoop uses HDFS for distributed storage and replication of data blocks across commodity servers. It also explains how MapReduce allows for massively parallel processing of large datasets by splitting jobs into mappers and reducers. Mappers process data blocks in parallel and generate intermediate key-value pairs, which are then sorted and grouped by the reducers to produce the final results.
The document describes the Hadoop ecosystem and its core components. It discusses HDFS, which stores large files across clusters and is made up of a NameNode and DataNodes. It also discusses MapReduce, which allows distributed processing of large datasets using a map and reduce function. Other components discussed include Hive, Pig, Impala, and Sqoop.
July 2010 Triangle Hadoop Users Group - Chad Vawter Slidesryancox
This document provides an overview of setting up a Hadoop cluster, including installing the Apache Hadoop distribution, configuring SSH keys for passwordless login between nodes, configuring environment variables and Hadoop configuration files, and starting and stopping the HDFS and MapReduce services. It also briefly discusses alternative Hadoop distributions from Cloudera and Yahoo, as well as using cloud platforms like Amazon EC2 for Hadoop clusters.
Ran Ziv introduces Apache Hadoop, an open-source software platform for distributed storage and processing of large datasets across clusters of computers. Hadoop consists of HDFS for storage and MapReduce for processing. HDFS stores data across clusters as blocks and provides high throughput even when hardware fails, while MapReduce allows parallel processing of data using "map" and "reduce" functions. A large ecosystem of projects has been built around Hadoop's core to support additional functionality such as data integration, querying, databases and scheduling. Hadoop works best for large datasets, batch processing and jobs where data can be distributed across nodes.
Doug Cutting created Apache Hadoop in 2005 after naming it after his son's stuffed elephant "Hadoop". Hadoop is an open-source software framework for distributed storage and processing of large datasets across clusters of computers. It consists of modules for distributed file system (HDFS), resource management (YARN), and distributed processing (MapReduce). HDFS stores large files across nodes and provides high throughput even if nodes fail, while MapReduce allows parallel processing of large datasets using a map and reduce model.
Understanding Hadoop Clusters and the Networkbradhedlund
This document provides an overview of Hadoop clusters and the network. It describes the typical roles in a Hadoop cluster including NameNode, DataNodes, JobTracker, and Secondary NameNode. It explains how data is written to HDFS in a distributed manner across multiple racks and DataNodes for redundancy. It also summarizes how MapReduce jobs are executed by distributing tasks to DataNodes where the data is located when possible for locality.
Updated version of my talk about Hadoop 3.0 with the newest community updates.
Talk given at the codecentric Meetup Berlin on 31.08.2017 and on Data2Day Meetup on 28.09.2017 in Heidelberg.
This presentation about Hadoop architecture will help you understand the architecture of Apache Hadoop in detail. In this video, you will learn what is Hadoop, components of Hadoop, what is HDFS, HDFS architecture, Hadoop MapReduce, Hadoop MapReduce example, Hadoop YARN and finally, a demo on MapReduce. Apache Hadoop offers a versatile, adaptable and reliable distributed computing big data framework for a group of systems with capacity limit and local computing power. After watching this video, you will also understand the Hadoop Distributed File System and its features along with the practical implementation.
Below are the topics covered in this Hadoop Architecture presentation:
1. What is Hadoop?
2. Components of Hadoop
3. What is HDFS?
4. HDFS Architecture
5. Hadoop MapReduce
6. Hadoop MapReduce Example
7. Hadoop YARN
8. Demo on MapReduce
What are the course objectives?
This course will enable you to:
1. Understand the different components of Hadoop ecosystem such as Hadoop 2.7, Yarn, MapReduce, Pig, Hive, Impala, HBase, Sqoop, Flume, and Apache Spark
2. Understand Hadoop Distributed File System (HDFS) and YARN as well as their architecture, and learn how to work with them for storage and resource management
3. Understand MapReduce and its characteristics, and assimilate some advanced MapReduce concepts
4. Get an overview of Sqoop and Flume and describe how to ingest data using them
5. Create database and tables in Hive and Impala, understand HBase, and use Hive and Impala for partitioning
6. Understand different types of file formats, Avro Schema, using Arvo with Hive, and Sqoop and Schema evolution
7. Understand Flume, Flume architecture, sources, flume sinks, channels, and flume configurations
8. Understand HBase, its architecture, data storage, and working with HBase. You will also understand the difference between HBase and RDBMS
9. Gain a working knowledge of Pig and its components
10. Do functional programming in Spark
11. Understand resilient distribution datasets (RDD) in detail
12. Implement and build Spark applications
13. Gain an in-depth understanding of parallel processing in Spark and Spark RDD optimization techniques
14. Understand the common use-cases of Spark and the various interactive algorithms
15. Learn Spark SQL, creating, transforming, and querying Data frames
Who should take up this Big Data and Hadoop Certification Training Course?
Big Data career opportunities are on the rise, and Hadoop is quickly becoming a must-know technology for the following professionals:
1. Software Developers and Architects
2. Analytics Professionals
3. Senior IT professionals
4. Testing and Mainframe professionals
5. Data Management Professionals
6. Business Intelligence Professionals
7. Project Managers
8. Aspiring Data Scientists
Learn more at https://www.simplilearn.com/big-data-and-analytics/big-data-and-hadoop-training
With Hadoop-3.0.0-alpha2 being released in January 2017, it's time to have a closer look at the features and fixes of Hadoop 3.0.
We will have a look at Core Hadoop, HDFS and YARN, and answer the emerging question whether Hadoop 3.0 will be an architectural revolution like Hadoop 2 was with YARN & Co. or will it be more of an evolution adapting to new use cases like IoT, Machine Learning and Deep Learning (TensorFlow)?
The document summarizes Apache Hadoop, an open-source software framework for distributed storage and processing of large datasets across clusters of computers. It describes the key components of Hadoop including the Hadoop Distributed File System (HDFS) which stores data reliably across commodity hardware, and the MapReduce programming model which allows distributed processing of large datasets in parallel. The document provides an overview of HDFS architecture, data flow, fault tolerance, and other aspects to enable reliable storage and access of very large files across clusters.
Hadoop Distributed File System (HDFS) is a distributed file system that stores large datasets across commodity hardware. It is highly fault tolerant, provides high throughput, and is suitable for applications with large datasets. HDFS uses a master/slave architecture where a NameNode manages the file system namespace and DataNodes store data blocks. The NameNode ensures data replication across DataNodes for reliability. HDFS is optimized for batch processing workloads where computations are moved to nodes storing data blocks.
Hadoop is an open source framework for running large-scale data processing jobs across clusters of computers. It has two main components: HDFS for reliable storage and Hadoop MapReduce for distributed processing. HDFS stores large files across nodes through replication and uses a master-slave architecture. MapReduce allows users to write map and reduce functions to process large datasets in parallel and generate results. Hadoop has seen widespread adoption for processing massive datasets due to its scalability, reliability and ease of use.
HDFS stores files as blocks that are by default 64 MB in size to minimize disk seek times. The namenode manages the file system namespace and metadata, tracking which datanodes store each block. When writing a file, HDFS breaks it into blocks and replicates each block across multiple datanodes. The secondary namenode periodically merges namespace and edit log changes to prevent the log from growing too large. Small files are inefficient in HDFS due to each file requiring namespace metadata regardless of size.
Presentation on 2013-06-27, Workshop on the future of Big Data management, discussing hadoop for a science audience that are either HPC/grid users or people suddenly discovering that their data is accruing towards PB.
The other talks were on GPFS, LustreFS and Ceph, so rather than just do beauty-contest slides, I decided to raise the question of "what is a filesystem?", whether the constraints imposed by the Unix metaphor and API are becoming limits on scale and parallelism (both technically and, for GPFS and Lustre Enterprise in cost).
Then: HDFS as the foundation for the Hadoop stack.
All the other FS talks did emphasise their Hadoop integration, with the Intel talk doing the most to assert performance improvements of LustreFS over HDFSv1 in dfsIO and Terasort (no gridmix?), which showed something important: Hadoop is the application that add DFS developers have to have a story for
This document provides an overview and introduction to Hadoop, HDFS, and MapReduce. It covers the basic concepts of HDFS, including how files are stored in blocks across data nodes, and the role of the name node and data nodes. It also explains the MapReduce programming model, including the mapper, reducer, and how jobs are split into parallel tasks. The document discusses using Hadoop from the command line and writing MapReduce jobs in Java. It also mentions some other projects in the Hadoop ecosystem like Pig, Hive, HBase and Zookeeper.
This document provides an overview of Hadoop, including its architecture, installation, configuration, and commands. It describes the challenges of large-scale data that Hadoop addresses through distributed processing and storage across clusters. The key components of Hadoop are HDFS for storage and MapReduce for distributed processing. HDFS stores data across clusters and provides fault tolerance through replication, while MapReduce allows parallel processing of large datasets through a map and reduce programming model. The document also outlines how to install and configure Hadoop in pseudo-distributed and fully distributed modes.
Hadoop Interview Questions and Answers by rohit kapakapa rohit
Hadoop Interview Questions and Answers - More than 130 real time questions and answers covering hadoop hdfs,mapreduce and administrative concepts by rohit kapa
There's a big shift in both at the architecture and api level from Hadoop 1 vs Hadoop 2, particularly YARN and we had our first meetup to talk about this (http://www.meetup.com/Atlanta-YARN-User-Group/) on 10/13/2013.
Hadoop is an open source framework for distributed storage and processing of large datasets across clusters of commodity hardware. It uses Google's MapReduce programming model and Google File System for reliability. The Hadoop architecture includes a distributed file system (HDFS) that stores data across clusters and a job scheduling and resource management framework (YARN) that allows distributed processing of large datasets in parallel. Key components include the NameNode, DataNodes, ResourceManager and NodeManagers. Hadoop provides reliability through replication of data blocks and automatic recovery from failures.
Hadoop is an open-source software framework for distributed storage and processing of large datasets across clusters of computers. It uses HDFS for data storage and MapReduce as a programming model for distributed computing. HDFS stores data reliably across machines in a Hadoop cluster as blocks and achieves high fault tolerance through replication. MapReduce allows processing of large datasets in parallel by dividing the work into independent tasks called Maps and Reduces. Hadoop has seen widespread adoption for applications involving massive datasets and is used by companies like Yahoo!, Facebook and Amazon.
This document provides an overview of HDFS and MapReduce. It discusses the core components of Hadoop including HDFS, the namenode, datanodes, and MapReduce components like the JobTracker and TaskTracker. It then covers HDFS topics such as the storage hierarchy, file reads and writes, blocks, and basic filesystem operations. It also summarizes MapReduce concepts like the inspiration from functional programming, the basic MapReduce flow, and example code for a word count problem.
This document provides an overview of Hadoop and MapReduce. It discusses how Hadoop uses HDFS for distributed storage and replication of data blocks across commodity servers. It also explains how MapReduce allows for massively parallel processing of large datasets by splitting jobs into mappers and reducers. Mappers process data blocks in parallel and generate intermediate key-value pairs, which are then sorted and grouped by the reducers to produce the final results.
The document describes the Hadoop ecosystem and its core components. It discusses HDFS, which stores large files across clusters and is made up of a NameNode and DataNodes. It also discusses MapReduce, which allows distributed processing of large datasets using a map and reduce function. Other components discussed include Hive, Pig, Impala, and Sqoop.
July 2010 Triangle Hadoop Users Group - Chad Vawter Slidesryancox
This document provides an overview of setting up a Hadoop cluster, including installing the Apache Hadoop distribution, configuring SSH keys for passwordless login between nodes, configuring environment variables and Hadoop configuration files, and starting and stopping the HDFS and MapReduce services. It also briefly discusses alternative Hadoop distributions from Cloudera and Yahoo, as well as using cloud platforms like Amazon EC2 for Hadoop clusters.
Ran Ziv introduces Apache Hadoop, an open-source software platform for distributed storage and processing of large datasets across clusters of computers. Hadoop consists of HDFS for storage and MapReduce for processing. HDFS stores data across clusters as blocks and provides high throughput even when hardware fails, while MapReduce allows parallel processing of data using "map" and "reduce" functions. A large ecosystem of projects has been built around Hadoop's core to support additional functionality such as data integration, querying, databases and scheduling. Hadoop works best for large datasets, batch processing and jobs where data can be distributed across nodes.
Doug Cutting created Apache Hadoop in 2005 after naming it after his son's stuffed elephant "Hadoop". Hadoop is an open-source software framework for distributed storage and processing of large datasets across clusters of computers. It consists of modules for distributed file system (HDFS), resource management (YARN), and distributed processing (MapReduce). HDFS stores large files across nodes and provides high throughput even if nodes fail, while MapReduce allows parallel processing of large datasets using a map and reduce model.
Understanding Hadoop Clusters and the Networkbradhedlund
This document provides an overview of Hadoop clusters and the network. It describes the typical roles in a Hadoop cluster including NameNode, DataNodes, JobTracker, and Secondary NameNode. It explains how data is written to HDFS in a distributed manner across multiple racks and DataNodes for redundancy. It also summarizes how MapReduce jobs are executed by distributing tasks to DataNodes where the data is located when possible for locality.
Updated version of my talk about Hadoop 3.0 with the newest community updates.
Talk given at the codecentric Meetup Berlin on 31.08.2017 and on Data2Day Meetup on 28.09.2017 in Heidelberg.
This presentation about Hadoop architecture will help you understand the architecture of Apache Hadoop in detail. In this video, you will learn what is Hadoop, components of Hadoop, what is HDFS, HDFS architecture, Hadoop MapReduce, Hadoop MapReduce example, Hadoop YARN and finally, a demo on MapReduce. Apache Hadoop offers a versatile, adaptable and reliable distributed computing big data framework for a group of systems with capacity limit and local computing power. After watching this video, you will also understand the Hadoop Distributed File System and its features along with the practical implementation.
Below are the topics covered in this Hadoop Architecture presentation:
1. What is Hadoop?
2. Components of Hadoop
3. What is HDFS?
4. HDFS Architecture
5. Hadoop MapReduce
6. Hadoop MapReduce Example
7. Hadoop YARN
8. Demo on MapReduce
What are the course objectives?
This course will enable you to:
1. Understand the different components of Hadoop ecosystem such as Hadoop 2.7, Yarn, MapReduce, Pig, Hive, Impala, HBase, Sqoop, Flume, and Apache Spark
2. Understand Hadoop Distributed File System (HDFS) and YARN as well as their architecture, and learn how to work with them for storage and resource management
3. Understand MapReduce and its characteristics, and assimilate some advanced MapReduce concepts
4. Get an overview of Sqoop and Flume and describe how to ingest data using them
5. Create database and tables in Hive and Impala, understand HBase, and use Hive and Impala for partitioning
6. Understand different types of file formats, Avro Schema, using Arvo with Hive, and Sqoop and Schema evolution
7. Understand Flume, Flume architecture, sources, flume sinks, channels, and flume configurations
8. Understand HBase, its architecture, data storage, and working with HBase. You will also understand the difference between HBase and RDBMS
9. Gain a working knowledge of Pig and its components
10. Do functional programming in Spark
11. Understand resilient distribution datasets (RDD) in detail
12. Implement and build Spark applications
13. Gain an in-depth understanding of parallel processing in Spark and Spark RDD optimization techniques
14. Understand the common use-cases of Spark and the various interactive algorithms
15. Learn Spark SQL, creating, transforming, and querying Data frames
Who should take up this Big Data and Hadoop Certification Training Course?
Big Data career opportunities are on the rise, and Hadoop is quickly becoming a must-know technology for the following professionals:
1. Software Developers and Architects
2. Analytics Professionals
3. Senior IT professionals
4. Testing and Mainframe professionals
5. Data Management Professionals
6. Business Intelligence Professionals
7. Project Managers
8. Aspiring Data Scientists
Learn more at https://www.simplilearn.com/big-data-and-analytics/big-data-and-hadoop-training
With Hadoop-3.0.0-alpha2 being released in January 2017, it's time to have a closer look at the features and fixes of Hadoop 3.0.
We will have a look at Core Hadoop, HDFS and YARN, and answer the emerging question whether Hadoop 3.0 will be an architectural revolution like Hadoop 2 was with YARN & Co. or will it be more of an evolution adapting to new use cases like IoT, Machine Learning and Deep Learning (TensorFlow)?
The document discusses Hadoop, its components, and how they work together. It covers HDFS, which stores and manages large files across commodity servers; MapReduce, which processes large datasets in parallel; and other tools like Pig and Hive that provide interfaces for Hadoop. Key points are that Hadoop is designed for large datasets and hardware failures, HDFS replicates data for reliability, and MapReduce moves computation instead of data for efficiency.
Hadoop - Just the Basics for Big Data Rookies (SpringOne2GX 2013)VMware Tanzu
Recorded at SpringOne2GX 2013 in Santa Clara, CA
Speaker: Adam Shook
This session assumes absolutely no knowledge of Apache Hadoop and will provide a complete introduction to all the major aspects of the Hadoop ecosystem of projects and tools. If you are looking to get up to speed on Hadoop, trying to work out what all the Big Data fuss is about, or just interested in brushing up your understanding of MapReduce, then this is the session for you. We will cover all the basics with detailed discussion about HDFS, MapReduce, YARN (MRv2), and a broad overview of the Hadoop ecosystem including Hive, Pig, HBase, ZooKeeper and more.
Learn More about Spring XD at: http://projects.spring.io/spring-xd
Learn More about Gemfire XD at:
http://www.gopivotal.com/big-data/pivotal-hd
The document discusses HDFS (Hadoop Distributed File System) including typical workflows like writing and reading files from HDFS. It describes the roles of key HDFS components like the NameNode, DataNodes, and Secondary NameNode. It provides examples of rack awareness, file replication, and how the NameNode manages metadata. It also discusses Yahoo's practices for HDFS including hardware used, storage allocation, and benchmarks. Future work mentioned includes automated failover using Zookeeper and scaling the NameNode.
This document provides an overview of Hadoop fundamentals including:
- Why Hadoop is used for big data applications due to its ability to handle petabytes of data across commodity hardware in a scalable and economical way.
- What Hadoop is and how it provides a distributed storage and processing infrastructure based on Google's papers using HDFS for storage and MapReduce for processing.
- How HDFS stores and replicates blocks of data across nodes to provide fault tolerance and how MapReduce uses a simple programming model of map and reduce functions to distribute processing.
- An example word count application is described to illustrate how MapReduce can be used to count word frequencies by mapping words to counts and then reducing the
Unified Batch & Stream Processing with Apache SamzaDataWorks Summit
The traditional lambda architecture has been a popular solution for joining offline batch operations with real time operations. This setup incurs a lot of developer and operational overhead since it involves maintaining code that produces the same result in two, potentially different distributed systems. In order to alleviate these problems, we need a unified framework for processing and building data pipelines across batch and stream data sources.
Based on our experiences running and developing Apache Samza at LinkedIn, we have enhanced the framework to support: a) Pluggable data sources and sinks; b) A deployment model supporting different execution environments such as Yarn or VMs; c) A unified processing API for developers to work seamlessly with batch and stream data. In this talk, we will cover how these design choices in Apache Samza help tackle the overhead of lambda architecture. We will use some real production use-cases to elaborate how LinkedIn leverages Apache Samza to build unified data processing pipelines.
Speaker
Navina Ramesh, Sr. Software Engineer, LinkedIn
A brief introduction to Hadoop distributed file system. How a file is broken into blocks, written and replicated on HDFS. How missing replicas are taken care of. How a job is launched and its status is checked. Some advantages and disadvantages of HDFS-1.x
Hadoop is an open-source software framework for distributed storage and processing of large datasets. It has three core components: HDFS for storage, MapReduce for processing, and YARN for resource management. HDFS stores data as blocks across clusters of commodity servers. MapReduce allows distributed processing of large datasets in parallel. YARN improves on MapReduce and provides a general framework for distributed applications beyond batch processing.
Hw09 Production Deep Dive With High AvailabilityCloudera, Inc.
ContextWeb is an online advertisement company that processes large volumes of log data using Hadoop. They process up to 120GB of raw log files per day. Their Hadoop cluster consists of 40 nodes and processes around 2000 MapReduce jobs per day. They developed techniques for partitioning data by date/time and using file revisions to allow incremental processing while ensuring data consistency and freshness of reports.
The document discusses data partitioning and distribution across multiple machines in a cluster. It explains that data replication does not scale well, but data partitioning, where each record exists on only one machine, allows write latency to scale with the number of machines in the cluster. Coherence provides a distributed cache that partitions data and offers functions for server-side processing near the data through tools like entry processors.
Virtual Flink Forward 2020: Netflix Data Mesh: Composable Data Processing - J...Flink Forward
Netflix processes trillions of events and petabytes of data a day in the Keystone data pipeline, which is built on top of Apache Flink. As Netflix has scaled up original productions annually enjoyed by more than 150 million global members, data integration across the streaming service and the studio has become a priority. Scalably integrating data across hundreds of different data stores in a way that enables us to holistically optimize cost, performance and operational concerns presented a significant challenge. Learn how we expanded the scope of the Keystone pipeline into the Netflix Data Mesh, our real-time, general-purpose, data transportation platform for moving data between Netflix systems. The Keystone Platform’s unique approach to declarative configuration and schema evolution, as well as our approach to unifying batch and streaming data and processing will be covered in depth.
DBSlayer is a middleware that allows web applications to access databases through HTTP and JSON. It provides a simple way to query databases by sending SQL statements in a JSON-formatted HTTP request and receiving the results of the query in the HTTP response also formatted in JSON. It aims to be independent, scalable, flexible and simple. Some features include connection pooling, load balancing queries across multiple databases, and automatic failover to alternate databases. It works by acting as an intermediary between web applications and databases, handling the network communication and database access transparently through its HTTP/JSON interface.
The document discusses network performance profiling of Hadoop jobs. It presents results from running two common Hadoop benchmarks - Terasort and Ranked Inverted Index - on different Amazon EC2 instance configurations. The results show that the shuffle phase accounts for a significant portion (25-29%) of total job runtime. They aim to reproduce existing findings that network performance is a key bottleneck for shuffle-intensive Hadoop jobs. Some questions are also raised about inconsistencies in reported network bandwidth capabilities for EC2.
DSD-INT 2017 The use of big data for dredging - De BoerDeltares
Presentation by Gerben de Boer (van Oord) at the Symposium Earth Observation and Data Science, during Delft Software Days - Edition 2017. Thursday, 2 November 2017, Delft.
LinkedIn leverages the Apache Hadoop ecosystem for its big data analytics. Steady growth of the member base at LinkedIn along with their social activities results in exponential growth of the analytics infrastructure. Innovations in analytics tooling lead to heavier workloads on the clusters, which generate more data, which in turn encourage innovations in tooling and more workloads. Thus, the infrastructure remains under constant growth pressure. Heterogeneous environments embodied via a variety of hardware and diverse workloads make the task even more challenging.
This talk will tell the story of how we doubled our Hadoop infrastructure twice in the past two years.
• We will outline our main use cases and historical rates of cluster growth in multiple dimensions.
• We will focus on optimizations, configuration improvements, performance monitoring and architectural decisions we undertook to allow the infrastructure to keep pace with business needs.
• The topics include improvements in HDFS NameNode performance, and fine tuning of block report processing, the block balancer, and the namespace checkpointer.
• We will reveal a study on the optimal storage device for HDFS persistent journals (SATA vs. SAS vs. SSD vs. RAID).
• We will also describe Satellite Cluster project which allowed us to double the objects stored on one logical cluster by splitting an HDFS cluster into two partitions without the use of federation and practically no code changes.
• Finally, we will take a peek at our future goals, requirements, and growth perspectives.
SPEAKERS
Konstantin Shvachko, Sr Staff Software Engineer, LinkedIn
Erik Krogen, Senior Software Engineer, LinkedIn
Ivanti’s Patch Tuesday breakdown goes beyond patching your applications and brings you the intelligence and guidance needed to prioritize where to focus your attention first. Catch early analysis on our Ivanti blog, then join industry expert Chris Goettl for the Patch Tuesday Webinar Event. There we’ll do a deep dive into each of the bulletins and give guidance on the risks associated with the newly-identified vulnerabilities.
In the realm of cybersecurity, offensive security practices act as a critical shield. By simulating real-world attacks in a controlled environment, these techniques expose vulnerabilities before malicious actors can exploit them. This proactive approach allows manufacturers to identify and fix weaknesses, significantly enhancing system security.
This presentation delves into the development of a system designed to mimic Galileo's Open Service signal using software-defined radio (SDR) technology. We'll begin with a foundational overview of both Global Navigation Satellite Systems (GNSS) and the intricacies of digital signal processing.
The presentation culminates in a live demonstration. We'll showcase the manipulation of Galileo's Open Service pilot signal, simulating an attack on various software and hardware systems. This practical demonstration serves to highlight the potential consequences of unaddressed vulnerabilities, emphasizing the importance of offensive security practices in safeguarding critical infrastructure.
HCL Notes und Domino Lizenzkostenreduzierung in der Welt von DLAUpanagenda
Webinar Recording: https://www.panagenda.com/webinars/hcl-notes-und-domino-lizenzkostenreduzierung-in-der-welt-von-dlau/
DLAU und die Lizenzen nach dem CCB- und CCX-Modell sind für viele in der HCL-Community seit letztem Jahr ein heißes Thema. Als Notes- oder Domino-Kunde haben Sie vielleicht mit unerwartet hohen Benutzerzahlen und Lizenzgebühren zu kämpfen. Sie fragen sich vielleicht, wie diese neue Art der Lizenzierung funktioniert und welchen Nutzen sie Ihnen bringt. Vor allem wollen Sie sicherlich Ihr Budget einhalten und Kosten sparen, wo immer möglich. Das verstehen wir und wir möchten Ihnen dabei helfen!
Wir erklären Ihnen, wie Sie häufige Konfigurationsprobleme lösen können, die dazu führen können, dass mehr Benutzer gezählt werden als nötig, und wie Sie überflüssige oder ungenutzte Konten identifizieren und entfernen können, um Geld zu sparen. Es gibt auch einige Ansätze, die zu unnötigen Ausgaben führen können, z. B. wenn ein Personendokument anstelle eines Mail-Ins für geteilte Mailboxen verwendet wird. Wir zeigen Ihnen solche Fälle und deren Lösungen. Und natürlich erklären wir Ihnen das neue Lizenzmodell.
Nehmen Sie an diesem Webinar teil, bei dem HCL-Ambassador Marc Thomas und Gastredner Franz Walder Ihnen diese neue Welt näherbringen. Es vermittelt Ihnen die Tools und das Know-how, um den Überblick zu bewahren. Sie werden in der Lage sein, Ihre Kosten durch eine optimierte Domino-Konfiguration zu reduzieren und auch in Zukunft gering zu halten.
Diese Themen werden behandelt
- Reduzierung der Lizenzkosten durch Auffinden und Beheben von Fehlkonfigurationen und überflüssigen Konten
- Wie funktionieren CCB- und CCX-Lizenzen wirklich?
- Verstehen des DLAU-Tools und wie man es am besten nutzt
- Tipps für häufige Problembereiche, wie z. B. Team-Postfächer, Funktions-/Testbenutzer usw.
- Praxisbeispiele und Best Practices zum sofortigen Umsetzen
GraphRAG for Life Science to increase LLM accuracyTomaz Bratanic
GraphRAG for life science domain, where you retriever information from biomedical knowledge graphs using LLMs to increase the accuracy and performance of generated answers
A Comprehensive Guide to DeFi Development Services in 2024Intelisync
DeFi represents a paradigm shift in the financial industry. Instead of relying on traditional, centralized institutions like banks, DeFi leverages blockchain technology to create a decentralized network of financial services. This means that financial transactions can occur directly between parties, without intermediaries, using smart contracts on platforms like Ethereum.
In 2024, we are witnessing an explosion of new DeFi projects and protocols, each pushing the boundaries of what’s possible in finance.
In summary, DeFi in 2024 is not just a trend; it’s a revolution that democratizes finance, enhances security and transparency, and fosters continuous innovation. As we proceed through this presentation, we'll explore the various components and services of DeFi in detail, shedding light on how they are transforming the financial landscape.
At Intelisync, we specialize in providing comprehensive DeFi development services tailored to meet the unique needs of our clients. From smart contract development to dApp creation and security audits, we ensure that your DeFi project is built with innovation, security, and scalability in mind. Trust Intelisync to guide you through the intricate landscape of decentralized finance and unlock the full potential of blockchain technology.
Ready to take your DeFi project to the next level? Partner with Intelisync for expert DeFi development services today!
Digital Banking in the Cloud: How Citizens Bank Unlocked Their MainframePrecisely
Inconsistent user experience and siloed data, high costs, and changing customer expectations – Citizens Bank was experiencing these challenges while it was attempting to deliver a superior digital banking experience for its clients. Its core banking applications run on the mainframe and Citizens was using legacy utilities to get the critical mainframe data to feed customer-facing channels, like call centers, web, and mobile. Ultimately, this led to higher operating costs (MIPS), delayed response times, and longer time to market.
Ever-changing customer expectations demand more modern digital experiences, and the bank needed to find a solution that could provide real-time data to its customer channels with low latency and operating costs. Join this session to learn how Citizens is leveraging Precisely to replicate mainframe data to its customer channels and deliver on their “modern digital bank” experiences.
FREE A4 Cyber Security Awareness Posters-Social Engineering part 3Data Hops
Free A4 downloadable and printable Cyber Security, Social Engineering Safety and security Training Posters . Promote security awareness in the home or workplace. Lock them Out From training providers datahops.com
Introduction of Cybersecurity with OSS at Code Europe 2024Hiroshi SHIBATA
I develop the Ruby programming language, RubyGems, and Bundler, which are package managers for Ruby. Today, I will introduce how to enhance the security of your application using open-source software (OSS) examples from Ruby and RubyGems.
The first topic is CVE (Common Vulnerabilities and Exposures). I have published CVEs many times. But what exactly is a CVE? I'll provide a basic understanding of CVEs and explain how to detect and handle vulnerabilities in OSS.
Next, let's discuss package managers. Package managers play a critical role in the OSS ecosystem. I'll explain how to manage library dependencies in your application.
I'll share insights into how the Ruby and RubyGems core team works to keep our ecosystem safe. By the end of this talk, you'll have a better understanding of how to safeguard your code.
Your One-Stop Shop for Python Success: Top 10 US Python Development Providersakankshawande
Simplify your search for a reliable Python development partner! This list presents the top 10 trusted US providers offering comprehensive Python development services, ensuring your project's success from conception to completion.
Generating privacy-protected synthetic data using Secludy and MilvusZilliz
During this demo, the founders of Secludy will demonstrate how their system utilizes Milvus to store and manipulate embeddings for generating privacy-protected synthetic data. Their approach not only maintains the confidentiality of the original data but also enhances the utility and scalability of LLMs under privacy constraints. Attendees, including machine learning engineers, data scientists, and data managers, will witness first-hand how Secludy's integration with Milvus empowers organizations to harness the power of LLMs securely and efficiently.
Skybuffer AI: Advanced Conversational and Generative AI Solution on SAP Busin...Tatiana Kojar
Skybuffer AI, built on the robust SAP Business Technology Platform (SAP BTP), is the latest and most advanced version of our AI development, reaffirming our commitment to delivering top-tier AI solutions. Skybuffer AI harnesses all the innovative capabilities of the SAP BTP in the AI domain, from Conversational AI to cutting-edge Generative AI and Retrieval-Augmented Generation (RAG). It also helps SAP customers safeguard their investments into SAP Conversational AI and ensure a seamless, one-click transition to SAP Business AI.
With Skybuffer AI, various AI models can be integrated into a single communication channel such as Microsoft Teams. This integration empowers business users with insights drawn from SAP backend systems, enterprise documents, and the expansive knowledge of Generative AI. And the best part of it is that it is all managed through our intuitive no-code Action Server interface, requiring no extensive coding knowledge and making the advanced AI accessible to more users.
Building Production Ready Search Pipelines with Spark and MilvusZilliz
Spark is the widely used ETL tool for processing, indexing and ingesting data to serving stack for search. Milvus is the production-ready open-source vector database. In this talk we will show how to use Spark to process unstructured data to extract vector representations, and push the vectors to Milvus vector database for search serving.
HCL Notes and Domino License Cost Reduction in the World of DLAUpanagenda
Webinar Recording: https://www.panagenda.com/webinars/hcl-notes-and-domino-license-cost-reduction-in-the-world-of-dlau/
The introduction of DLAU and the CCB & CCX licensing model caused quite a stir in the HCL community. As a Notes and Domino customer, you may have faced challenges with unexpected user counts and license costs. You probably have questions on how this new licensing approach works and how to benefit from it. Most importantly, you likely have budget constraints and want to save money where possible. Don’t worry, we can help with all of this!
We’ll show you how to fix common misconfigurations that cause higher-than-expected user counts, and how to identify accounts which you can deactivate to save money. There are also frequent patterns that can cause unnecessary cost, like using a person document instead of a mail-in for shared mailboxes. We’ll provide examples and solutions for those as well. And naturally we’ll explain the new licensing model.
Join HCL Ambassador Marc Thomas in this webinar with a special guest appearance from Franz Walder. It will give you the tools and know-how to stay on top of what is going on with Domino licensing. You will be able lower your cost through an optimized configuration and keep it low going forward.
These topics will be covered
- Reducing license cost by finding and fixing misconfigurations and superfluous accounts
- How do CCB and CCX licenses really work?
- Understanding the DLAU tool and how to best utilize it
- Tips for common problem areas, like team mailboxes, functional/test users, etc
- Practical examples and best practices to implement right away
This presentation provides valuable insights into effective cost-saving techniques on AWS. Learn how to optimize your AWS resources by rightsizing, increasing elasticity, picking the right storage class, and choosing the best pricing model. Additionally, discover essential governance mechanisms to ensure continuous cost efficiency. Whether you are new to AWS or an experienced user, this presentation provides clear and practical tips to help you reduce your cloud costs and get the most out of your budget.
Programming Foundation Models with DSPy - Meetup SlidesZilliz
Prompting language models is hard, while programming language models is easy. In this talk, I will discuss the state-of-the-art framework DSPy for programming foundation models with its powerful optimizers and runtime constraint system.
2. Agenda
• Different Hadoop daemons & its roles
• How does a Hadoop cluster look like
• Under the Hood:- How does it write a file
• Under the Hood:- How does it read a file
• Under the Hood:- How does it replicate the file
• Under the Hood:- How does it run a job
• How to balance an un-balanced hadoop cluster
3. Hadoop – A bit of background
• It’s an open source project
• Based on 2 technical papers published by Google
• A well known platform for distributed applications
• Easy to scale-out
• Works well with commodity hard wares(not entirely true)
• Very good for background applications
4. Hadoop Architecture
• Two Primary components
Distributed File System (HDFS): It deals with file
operations like read, write, delete & etc
Map Reduce Engine: It deals with parallel computation
5. Hadoop Distributed File System
• Runs on top of existing file system
• A file broken into pre-defined equal sized blocks & stored
individually
• Designed to handle very large files
• Not good for huge number of small files
6. Map Reduce Engine
• A Map Reduce Program consists of map and reduce functions
• A Map Reduce job is broken into tasks that run in parallel
• Prefers local processing if possible
7. Hadoop Server Roles
Data Node &
Task Tracker
Data Node &
Task Tracker
Data Node &
Task Tracker
Data Node &
Task Tracker
Data Node &
Task Tracker
Data Node &
Task Tracker
slaves
masters
Clients
Name NodeJob Tracker
Secondary
Name Node
Map Reduce HDFS
Distributed Data Analytics Distributed Data Storage
9. Typical Workflow
Typical Workflow
• Load data into the cluster (HDFS writes)
• Analyze the data (Map Reduce)
• Store results in the cluster (HDFS writes)
• Read the results from the cluster (HDFS reads)
How many times did our customers type the word
“Fraud” into emails sent to customer service?
Sample Scenario:
File.txt
Huge file containing all emails sent
to customer service
BRAD HEDLUND .com
10. Writing files to HDFS
• Client consults Name Node
• Client writes block directly to one Data Node
• Data Nodes replicates block
• Cycle repeats for next block
Name Node
Data Node 1 Data Node 5 Data Node 6 Data Node N
Client
I want to write
Blocks A,B,C of
File.txt
OK. Write to
Data Nodes
1,5,6
Blk A Blk B Blk C
File.txt
Blk A Blk B Blk C
11. switch
switchswitch
Preparing HDFS writes
Name Node
Data Node 1 Data Node 5
Data Node 6
Client
I want to write
File.txt
Block A
OK. Write to
Data Nodes
1,5,6
Blk A Blk B Blk C
File.txt
Ready
Data Nodes
5,6
Ready?
Rack 1 Rack 5
Rack 1:
Data Node 1
Rack 5:
Data Node 5
Data Node 6
Ready
Data Node 6
Rack aware
Ready! • Name Node picks
two nodes in the
same rack, one
node in a different
rack
• Data protection
• Locality for M/R
Ready!
BRAD HEDLUND .com
12. switch
switchswitch
Pipelined Write
Name Node
Data Node 1 Data Node 5
Data Node 6
Client
Blk A Blk B Blk C
File.txt
Rack 1 Rack 5
Rack 1:
Data Node 1
Rack 5:
Data Node 5
Data Node 6
A A
A
• Data Nodes 1
& 2 pass data
along as its
received
• TCP 50010
Rack aware
BRAD HEDLUND .com
13. switch
switchswitch
Pipelined Write
Name Node
Data Node 1 Data Node 2
Data Node 3
Client
Blk A Blk B Blk C
File.txt
Rack 1 Rack 5
Rack 1:
Data Node 1
Rack 5:
Data Node 2
Data Node 3
A A
A
Block received
Success
File.txt
Blk A:
DN1, DN2, DN3
BRAD HEDLUND .com
14. Multi-block Replication Pipeline
Data Node 1 Data Node X
Data Node 3
Rack 1
switch
switch
Client
switch
Blk A Blk A
Blk A
Rack 4
Data Node 2
Rack 5
switch
Data Node Y
Data Node Z
Blk B
Blk B
Blk B
Data Node W
Blk C
Blk C
Blk C
Blk A Blk B Blk C
File.txt 1TB File =
3TB storage
3TB network traffic
BRAD HEDLUND .com
15. Client writes Span the HDFS Cluster
Client
Rack N
Data Node
Data Node
Data Node
Data Node
Data Node
Data Node
switch
File.txt
Rack 4
Data Node
Data Node
Data Node
Data Node
Data Node
Data Node
switch
Rack 3
Data Node
Data Node
Data Node
Data Node
Data Node
Data Node
switch
Rack 2
Data Node
Data Node
Data Node
Data Node
Data Node
Data Node
switch
Rack 1
Data Node
Data Node
Data Node
Data Node
Data Node
Data Node
switch
• Block size
• File Size
Factors:
More blocks = Wider spread
BRAD HEDLUND .com
16. Hadoop Rack Awareness – Why?
Name Node
File.txt=
Blk A:
DN1, DN5, DN6
Blk B:
DN7, DN1, DN2
Blk C:
DN5, DN8,DN9
metadata
Rack 1
Data Node 1
Data Node 2
Data Node 3
Data Node 5
switch
A
Rack 5
Data Node 5
Data Node 6
Data Node 7
Data Node 8
switch
Rack 9
Data Node 9
Data Node 10
Data Node 11
Data Node 12
switch
• Never loose all data if entire rack fails
• Keep bulky flows in-rack when possible
• Assumption that in-rack is higher bandwidth,
lower latency
A
A
BB
B
C C
C
switch
Rack 1:
Data Node 1
Data Node 2
Data Node 3
Rack 5:
Data Node 5
Data Node 6
Data Node 7
Rack aware
BRAD HEDLUND .com
17. Name Node
• Data Node sends Heartbeats
• Every 10th heartbeat is a Block report
• Name Node builds metadata from Block reports
• TCP – every 3 seconds
• If Name Node is down, HDFS is down
Name Node
Data Node 1 Data Node 2 Data Node 3 Data Node N
A AA CC
DN1: A,C
DN2: A,C
DN3: A,C
metadata
File.txt = A,C
C
File system
Awesome!
Thanks.
I’m
alive!
I have
blocks:
A, C
BRAD HEDLUND .com
18. Re-replicating missing replicas
Name Node
Data Node 1 Data Node 2 Data Node 3 Data Node 8
A AA CC
DN1: A,C
DN2: A,C
DN3: A, C
metadata
Rack1: DN1, DN2
Rack5: DN3,
Rack9: DN8
C
Rack Awareness
Uh Oh!
Missing
replicas
Copy
blocks A,C
to Node 8
A C
• Missing Heartbeats signify lost Nodes
• Name Node consults metadata, finds affected data
• Name Node consults Rack Awareness script
• Name Node tells a Data Node to re-replicate
BRAD HEDLUND .com
19. Secondary Name Node
• Not a hot standby for the Name Node
• Connects to Name Node every hour*
• Housekeeping, backup of Name Node metadata
• Saved metadata can rebuild a failed Name Node
Name Node
metadata
File.txt = A,C
File system
Secondary
Name Node
Its been an hour,
give me your
metadata
BRAD HEDLUND .com
20. Client reading files from HDFS
Name Node
Client
Tell me the
block locations
of Results.txt
Blk A = 1,5,6
Blk B = 8,1,2
Blk C = 5,8,9
Results.txt=
Blk A:
DN1, DN5, DN6
Blk B:
DN7, DN1, DN2
Blk C:
DN5, DN8,DN9
metadata
Rack 1
Data Node 1
Data Node 2
Data Node
Data Node
switch
A
Rack 5
Data Node 5
Data Node 6
Data Node
Data Node
switch
Rack 9
Data Node 8
Data Node 9
Data Node
Data Node
switch
• Client receives Data Node list for each block
• Client picks first Data Node for each block
• Client reads blocks sequentially
A
A
BB
B
C C
C
BRAD HEDLUND .com
21. Data Processing: Map
• Map: “Run this computation on your local data”
• Job Tracker delivers Java code to Nodes with local data
Map Task Map Task Map Task
A B C
Client
How many
times does
“Fraud” appear
in File.txt?
Count
“Fraud”
in Block C
File.txt
Fraud = 3 Fraud = 0 Fraud = 11
Job TrackerName Node
Data Node 1 Data Node 5 Data Node 9
BRAD HEDLUND .com
22. switchswitchswitch
What if d ta isn’t local?
• Job Tracker tries to select Node in same rack as data
• Name Node rack awareness
“I need block A”
Map Task Map Task
B C
Client
How many
times does
“Fraud” appear
in File.txt?
Count
“Fraud”
in Block C
Fraud = 0 Fraud = 11
Job TrackerName Node
Data Node 1
Data Node 5 Data Node 9
“no Map tasks left”
A
Data Node 2
Rack 1 Rack 5 Rack 9
BRAD HEDLUND .com
23. Data Node reading files from HDFS
Name Node
Block A = 1,5,6
File.txt=
Blk A:
DN1, DN5, DN6
Blk B:
DN7, DN1, DN2
Blk C:
DN5, DN8,DN9
metadata
Rack 1
Data Node 1
Data Node 2
Data Node 3
Data Node
switch
A
Rack 5
Data Node 5
Data Node 6
Data Node
Data Node
switch
Rack 9
Data Node 8
Data Node 9
Data Node
Data Node
switch
• Name Node provides rack local Nodes first
• Leverage in-rack bandwidth, single hop
A
A
BB
B
C C
C
Tell me the
locations of
Block A of
File.txt switch
Rack 1:
Data Node 1
Data Node 2
Data Node 3
Rack 5:
Data Node 5
Rack aware
BRAD HEDLUND .com
24. Data Processing: Reduce
• Reduce: “Run this computation across Map results”
• Map Tasks deliver output data over the network
• Reduce Task data output written to and read from HDFS
Fraud = 0
Job Tracker
Reduce Task
Sum
“Fraud”
Results.txt
Fraud = 14
Map Task Map Task Map Task
A B C
Client
HDFS
X Y Z
Data Node 1 Data Node 5 Data Node 9
Data Node 3
BRAD HEDLUND .com
25. Unbalanced Cluster
New Rack
Data Node
Data Node
Data Node
Data Node
Data Node
Data Node
switch
Rack 2
Data Node
Data Node
Data Node
Data Node
Data Node
Data Node
switch
Rack 1
Data Node
Data Node
Data Node
Data Node
Data Node
Data Node
switch NEW
switch
New Rack
Data Node
Data Node
Data Node
Data Node
Data Node
Data Node
switch NEW
File.txt
• Hadoop prefers local processing if possible
• New servers underutilized for Map Reduce, HDFS*
• Might see more network bandwidth, slower job times**
**I was assigned
a Map Task but
don’t have th e
block. Guess I
need to get it.
*I’m bored!
BRAD HEDLUND .com
Unbalanced Cluster
New Rack
Data Node
Data Node
Data Node
Data Node
Data Node
Data Node
switch
Rack 2
Data Node
Data Node
Data Node
Data Node
Data Node
Data Node
switch
Rack 1
Data Node
Data Node
Data Node
Data Node
Data Node
Data Node
switch NEW
switch
New Rack
Data Node
Data Node
Data Node
Data Node
Data Node
Data Node
switch NEW
File.txt
• Hadoop prefers local processing if possible
• New servers underutilized for Map Reduce, HDFS*
• Might see more network bandwidth, slower job times**
**I was assigned
a Map Task but
don’t have th e
block. Guess I
need to get it.
*I’m bored!
BRAD HEDLUND .com
26. Cluster BalancingCluster Balancing
New Rack
Data Node
Data Node
Data Node
Data Node
Data Node
Data Node
switch
Rack 2
Data Node
Data Node
Data Node
Data Node
Data Node
Data Node
switch
Rack 1
Data Node
Data Node
Data Node
Data Node
Data Node
Data Node
switch NEW
switch
New Rack
Data Node
Data Node
Data Node
Data Node
Data Node
Data Node
switch NEW
File.txt
• Balancer utility (if used) runs in the background
• Does not interfere with Map Reduce or HDFS
• Default speed limit 1 MB/s
brad@cloudera-1:~$hadoop balancer
BRAD HEDLUND .com
27. Quiz
• If you had written a file of size 1TB into
HDFS with replication factor 2, What is
the actual size required by the HDFS to
store this file?
• True/False? Even if Name node goes
down, I still will be able to read files from
HDFS.
28. Quiz
• True/False? In Hadoop Cluster, We can
have a secondary Job Tracker to enhance
the fault tolerance.
• True/False? If Job Tracker goes down, You
will not be able to write any file into
HDFS.
29. Quiz
• True/False? Name node stores the actual
data itself.
• True/False? Name node can be re-built using
the secondary name node.
• True/False? If a data node goes down,
Hadoop takes care of re-replicating the
affected data block.
30. Quiz
• In which scenario, one data node tries to
read data from another data node?
• What are the benefits of Name node’s rack-
awareness?
• True/False? HDFS is well suited for
applications which write huge number of
small files.
31. Quiz
• True/False? Hadoop takes care of
balancing the cluster automatically?
• True/False? Output of Map tasks are
written to HDFS file?
• True/False? Output of Reduce tasks are
written to HDFS file?
32. Quiz
• True/False? In production cluster,
commodity hardware can be used to
setup Name node.
• Thank You