By Deepak Vohra
Study the basic foundations and ideas of the Apache HBase (NoSQL) open resource database. It covers the HBase facts version, structure, schema layout, API, and management. Apache HBase is the database for the Apache Hadoop framework. HBase is a column kinfolk dependent NoSQL database that gives a versatile schema version.
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96, the -ROOT- table has been removed and the META locations are stored in the ZooKeeper, as shown in Figure 2-25. 34 CHAPTER 2 ■ APACHE HBASE AND HDFS Figure 2-25. META. table locations are stored in the ZooKeeper HBase Java Client API The HBase Java client API is used mainly for the CRUD (Create/Retrieve/Update/Delete) operations. The HBase Java Client API provides two main interfaces, as discussed in Table 2-6. Table 2-6. hbase. HBaseAdmin metadata and for general administrative functions such as create, drop, list, enable, and disable tables.
To find a key, scan all of the files with some optimizations. To filter files, the startKey/endKey may be used. A bloom filter may also be used to find the file with the key. HFile Format The HFile format is designed for sequential writes with append (k,v) and large sequential reads. Records are grouped into blocks, as shown in Figure 2-21, because they are easy to split, easy to read, easy to cache, easy to index (if records are sorted), and suitable for block compression (snappy, lz4, gz). 30 CHAPTER 2 ■ APACHE HBASE AND HDFS Figure 2-21.
Deepak Vohra 2016 D. 1007/978-1-4842-2424-3_4 51 CHAPTER 4 ■ PHYSICAL STORAGE Summary In this chapter, I discussed how HBase physically stores data in HDFS, with each RegionServer being collocated with a datanode. In the next chapter, I will discuss the column family and the column qualifier. 52 CHAPTER 5 Column Family and Column Qualifier Column qualifiers are the column names, also known as column keys. For example, in Figure 5-1, Column A and Column B are the column qualifiers. A table value is stored at the intersection of a column and a row.