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Hadoop 2.x Administration Cookbook

You're reading from  Hadoop 2.x Administration Cookbook

Product type Book
Published in May 2017
Publisher Packt
ISBN-13 9781787126732
Pages 348 pages
Edition 1st Edition
Languages
Concepts
Author (1):
Aman Singh Aman Singh
Profile icon Aman Singh
LinkedIn
Gurmukh Singh is a seasoned technology professional with 14+ years of industry experience in infrastructure design, distributed systems, performance optimization, and networks. He has worked in big data domain for the last 5 years and provides consultancy and training on various technologies. He has worked with companies such as HP, JP Morgan, and Yahoo. He has authored Monitoring Hadoop by Packt Publishing
See other products by Aman Singh

Table of Contents (20) Chapters

Hadoop 2.x Administration Cookbook
Credits
About the Author
About the Reviewers
www.PacktPub.com
Customer Feedback
Preface
Hadoop Architecture and Deployment Maintaining Hadoop Cluster HDFS Maintaining Hadoop Cluster – YARN and MapReduce High Availability Schedulers Backup and Recovery Data Ingestion and Workflow Performance Tuning HBase Administration Cluster Planning Troubleshooting, Diagnostics, and Best Practices Security Index

Namenode recovery

In this recipe, we will cover how to recover Namenode from corrupted edits or fsimage. During the Namenode startup, the edits is check pointed into the fsimage image . What if the image is corrupted? Will the Namenode boot up?

In a worst-case scenario, it recovers as much data as possible and removes any corrupted entries from metadata so that the Namenode can start up.

Getting ready

For this recipe, make sure you have completed the recipe on Hadoop cluster setup, Chapter 1, Hadoop Architecture and Deployment, and have at least HDFS running perfectly.

How to do it...

  1. Connect to the master1.cyrus.com master node and switch to user hadoop.

  2. While attempting to start the Namenode, it just fails with bad or corrupted blocks and we have no way to bring the Namenode up.

  3. Remember we cannot run fsck if Namenode is not running.

  4. As a last resort, we will try to skip the missing or corrupted metadata and start the Namenode with a cleaner image.

  5. To start the Namenode recover process, use the...

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Authors (1)

Profile icon Aman Singh
LinkedIn
Gurmukh Singh is a seasoned technology professional with 14+ years of industry experience in infrastructure design, distributed systems, performance optimization, and networks. He has worked in big data domain for the last 5 years and provides consultancy and training on various technologies. He has worked with companies such as HP, JP Morgan, and Yahoo. He has authored Monitoring Hadoop by Packt Publishing
See other products by Aman Singh

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