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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

Deciding the number of the version


Now, let's discuss the maximum and minimum numbers of a version we can consider for a table. This information is maintained using HColumnDescriptor, which contains information about a column family, such as the number of versions and compression settings. This acts as input for table creation and addition of columns.

Lower bound of versions

The default lower bound of version is 0, which means it is disabled. The minimum number of rows a version uses is in conjunction with Time To Live (TTL), and we can have 0 or more for a version, according to the requirements of the use case. Using 0 for version will prevent the writing of more than one value to the cell.

Upper bound of versions

The default upper bound for a version is 3, which keeps three copies (inserted on the basis of a timestamp) of a row. It is advised that the maximum number should not be very large as it is storage-centric too. So, more or less 100 can be thought of as the upper bound, which is not...

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