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Learning Hbase

You're reading from   Learning Hbase Learn the fundamentals of HBase administration and development with the help of real-time scenarios

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Product type Paperback
Published in Nov 2014
Publisher
ISBN-13 9781783985944
Length 326 pages
Edition 1st Edition
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Author (1):
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Shashwat Shriparv Shashwat Shriparv
Author Profile Icon Shashwat Shriparv
Shashwat Shriparv
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Table of Contents (12) Chapters Close

Preface 1. Understanding the HBase Ecosystem FREE CHAPTER 2. Let's Begin with HBase 3. Let's Start Building It 4. Optimizing the HBase/Hadoop Cluster 5. The Storage, Structure Layout, and Data Model of HBase 6. HBase Cluster Maintenance and Troubleshooting 7. Scripting in HBase 8. Coding HBase in Java 9. Advance Coding in Java for HBase 10. HBase Use Cases Index

HBase administration tools


Here, we will discuss HBase administrating tools that are already available. We will also study the HBase check (hbck) and the HBase health check script a bit more.

hbck – HBase check

The hbck command is used to check/repair HBase. This command finds out inconsistencies in the HBase cluster, if they exist, and gives a formatted output for them. This command/tool checks for region consistency and table integrity problems. It works in two modes:

  • Read-only mode: This only displays inconsistencies if they exist

  • Read-write-repair mode: This reports inconsistencies and tries to repair them

It is good to repair inconsistencies that have lower risk while executing a repair hbck command. These region consistency repairs are localized-single-region repairs, which only modify in-memory data, wrong ZooKeeper data, or patch holes in the metadata table (an inconsistency exists if every possible row key doesn't resolve to exactly one region, and if every region isn't assigned and...

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