Download e-book for kindle: Apache HBase Primer by Deepak Vohra

By Deepak Vohra

Study the basic foundations and ideas of the Apache HBase (NoSQL) open resource database. It covers the HBase info version, structure, schema layout, API, and management. Apache HBase is the database for the Apache Hadoop framework. HBase is a column family members dependent NoSQL database that gives a versatile schema version.

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Extra resources for Apache HBase Primer

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The write path for append-only read/write 29 CHAPTER 2 ■ APACHE HBASE AND HDFS The Read Path for Reading Data The read path for reading data is as follows (and is shown in Figure 2-20): 1. META. location from the ZooKeeper. 2. META. for the RegionServer responsible for handling the key. 3. The clients request the RegionServer to get the specified key/ value. 4. The RegionServer processes and dispatches the request to the region responsible for handling the key. MemStore and store files are scanned to find the key.

1. HBase performs a binary search in the index, first in memory, to locate the block that could potentially contain the key. 2. When the block is located, a single disk seek is performed to load the block that is to be subsequently checked for the key. 3. The loaded 64k HBase block is searched for the key and, if found, the key-value is returned. Small block sizes provide efficient disk usage when performing random accesses, but this increases the index size and memory requirements. Data Files (HFile) Data files are immutable once written.

The ZooKeeper stores global information about the cluster. META. tables list all of the regions and their locations. META. tables. The HBase objects stored in the Datanodes may be browsed from the NameNode web application running at port 50070. The HDFS directory structure for HBase data files is as follows (also shown in Figure 2-11): /hbase/

is the HBase table. is the region. is the column family. is the store file or HFile.

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