By Deepak Vohra

Examine the elemental foundations and ideas of the Apache HBase (NoSQL) open resource database. It covers the HBase information version, structure, schema layout, API, and management. Apache HBase is the database for the Apache Hadoop framework. HBase is a column kinfolk established NoSQL database that gives a versatile schema version.

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Example text

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. Figure 2-11. logs// A StoreFile (HFile) is created every time the MemStore flushes.

Checksums HDFS checksums are not inlined. They are two files per block, one for data and one for checksums, as shown in Figure 2-29. 40 CHAPTER 2 ■ APACHE HBASE AND HDFS Figure 2-29. Two files per block Random positioned read causes two seeks. 94. HFile v 2-1 writes checksums per HFile block. The HFile data block chunk and the Checksum chunk are shown in Figure 2-30. HDFS checksum verification is bypassed on block read as checksum verification is done by HBase. If the HBase checksum fails, revert to checksum verification from HDFS for some time.

If compactions have been run only one HFile. An HFile contains a large number of data blocks that are kept small for fast random access. At the end of the HFile an index references these blocks and keeps the range of keys in each block and offset of the block in the HFile. When an HFile is first read, the index is loaded into memory and kept in memory for future accesses. 1. HBase performs a binary search in the index, first in memory, to locate the block that could potentially contain the key.

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Apache HBase Primer by Deepak Vohra

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