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You're reading from  Mastering Hadoop 3

Product typeBook
Published inFeb 2019
Reading LevelExpert
PublisherPackt
ISBN-139781788620444
Edition1st Edition
Languages
Java
Tools
Hadoop
Concepts
Data Processing
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Authors (2):
Chanchal Singh
Chanchal Singh
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Chanchal Singh

Chanchal Singh has over half decades experience in Product Development and Architect Design. He has been working very closely with leadership team of various companies including directors ,CTO's and Founding members to define technical road-map for company.He is the Founder and Speaker at meetup group Big Data and AI Pune MeetupExperience Speaks. He is Co-Author of Book Building Data Streaming Application with Apache Kafka. He has a Bachelor's degree in Information Technology from the University of Mumbai and a Master's degree in Computer Application from Amity University. He was also part of the Entrepreneur Cell in IIT Mumbai. His Linkedin Profile can be found at with the username Chanchal Singh.
Read more about Chanchal Singh

Manish Kumar
Manish Kumar
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Manish Kumar

Manish Kumar works as Director of Technology and Architecture at VSquare. He has over 13 years' experience in providing technology solutions to complex business problems. He has worked extensively on web application development, IoT, big data, cloud technologies, and blockchain. Aside from this book, Manish has co-authored three books (Mastering Hadoop 3, Artificial Intelligence for Big Data, and Building Streaming Applications with Apache Kafka).
Read more about Manish Kumar

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NameNode

NameNode is mater daemon in the HDFS and every client request for read and write goes through NameNode. If NameNode performance decreases, then it will eventually lead to the application performance decreases because NameNode will respond slowly to any request made to it. Let's look into how we do profiling for NameNode performance.

NNBench

NameNode is the heart of the Hadoop cluster. Any file operations in HDFS first goes through the NameNode. NameNode, apart from managing file operations, keeps track of all file locations on DataNodes. So it is important that you test NameNode performance against chosen hardware configurations. NNBench is one such tool that can help you in evaluating that. Based on the NNBench output, you can decide on the optimal configuration of NameNode as well. The following is the command to run NNBench (Ref: Hadoop 3 Apache Document):

hadoop jar <HADOOP_CLIENT_INSTALLATION_PATH>/hadoop-mapreduce-client-jobclient-<HADOOP_VERSION>-tests.jar nnbench...
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Mastering Hadoop 3
Published in: Feb 2019Publisher: PacktISBN-13: 9781788620444
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Authors (2)

author image
Chanchal Singh

Chanchal Singh has over half decades experience in Product Development and Architect Design. He has been working very closely with leadership team of various companies including directors ,CTO's and Founding members to define technical road-map for company.He is the Founder and Speaker at meetup group Big Data and AI Pune MeetupExperience Speaks. He is Co-Author of Book Building Data Streaming Application with Apache Kafka. He has a Bachelor's degree in Information Technology from the University of Mumbai and a Master's degree in Computer Application from Amity University. He was also part of the Entrepreneur Cell in IIT Mumbai. His Linkedin Profile can be found at with the username Chanchal Singh.
Read more about Chanchal Singh

author image
Manish Kumar

Manish Kumar works as Director of Technology and Architecture at VSquare. He has over 13 years' experience in providing technology solutions to complex business problems. He has worked extensively on web application development, IoT, big data, cloud technologies, and blockchain. Aside from this book, Manish has co-authored three books (Mastering Hadoop 3, Artificial Intelligence for Big Data, and Building Streaming Applications with Apache Kafka).
Read more about Manish Kumar

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