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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 layout on top of Hadoop

The following figure represents the layout information of HBase on top of Hadoop:

HBase layout on top of Hadoop

There is more than one ZooKeeper in the setup, which provides high availability of master status; a RegionServer may contain multiple rations. The RegionServers run on the machines where DataNodes run. There can be as many RegionServers as DataNodes. RegionServers can have multiple HRegions; one HRegion can have one HLog and multiple HFiles with its associate's MemStore.

HBase can be seen as a master-slave database where the master is called HMaster, which is responsible for coordination between client application and HRegionServer. It is also responsible for monitoring and recording metadata changes and management. Slaves are called HRegionServers, which serve the actual tables in form of regions. These regions are the basic building blocks of the HBase tables, which contain distribution of tables. So, HMaster and RegionServer work in coordination to serve the HBase tables and HBase cluster.

Usually, HMaster is co-hosted with Hadoop NameNode daemon process on a server and communicates to DataNode daemon for reading and writing data on HDFS. The RegionServer runs or is co-hosted on the Hadoop DataNodes.

You have been reading a chapter from
Learning Hbase
Published in: Nov 2014
Publisher:
ISBN-13: 9781783985944
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