By Deepak Vohra
Research 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 offers a versatile schema version.
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Extra info for Apache HBase Primer
To be used on the client side. getFamily() Returns the column family of the KeyValue. To be used on the client side. getQualifier() Returns the column qualifier of the KeyValue. To be used on the client side. getTimestamp() Returns the timestamp. To be used on the client side. getBuffer() Returns the byte for the KeyValue. To be used on the server side. getKey() Not to be used directly. Used internally for compacting and testing. 21 CHAPTER 2 ■ APACHE HBASE AND HDFS When data is added to HBase, the following sequence is used to store the data: 1.
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. HBaseAdmin is also used to add and drop table column families. hbase. HTable table. The class is not thread-safe for reads and writes.
Different column qualifiers The HBase data model consists of a table, which consists of multiple rows. A row consists of a row key and one or more columns, and the columns have values associated with them. Rows are sorted lexicographically and stored. To store related rows adjacent or near each other, a common row key pattern is usually used. A column, which stores a value, consists of a column family name and a column qualifier delimited by a : (colon). For example, column family cf1 could consist of column qualifiers (or column keys) c1, c2, and c3.