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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

Versioning and why


As we already discussed version for a record, there is a tuple consisting of {row, column, version} that defines a cell and its value. We can have as many versions as we want, but the number of versions should be decided optimally as it is storage dependent. It means the more versions, the more disk space it requires (it is possible to have an unbounded number of cell versions).

The version is denoted using a long value. The versioned values are stored in descending order so as to keep the most recent value on top. So, when we fetch records, the most recent version is returned.

Let's consider a scenario to version HBase.

Suppose we have an employee database with the employee_history table where we need to keep all the details of a person's previous company. We can enable versioning (increase to whatever number we like to have after a default of 3) and keep all previous and current details of the employee, such as their employment history and scenarios similar to this.

We can...

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