Download Apache HBase Primer by Deepak Vohra PDF

By Deepak Vohra

Research the basic 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 relatives established NoSQL database that offers a versatile schema version.

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The client requests the RegionServer to insert/update/delete the specified key/value. 5. The RegionServer processes and dispatches the request to the region responsible for handling the key. The insert/update/ delete operation is written to a WAL. The KeyVaues are added to the store named MemStore. When the MemStore becomes full, it is flushed to a StoreFile on the disk. CHAPTER 2 ■ APACHE HBASE AND HDFS Figure 2-18. The write path to insert data The Write Path to Append-Only R/W HBase files in HDFS are append-only and immutable once closed.

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. In a multi-threaded environment, HTablePool should be used. The interface communicates directly with the RegionServers for handling the requested set of keys. HTable is used by a client for get/put/delete and all other data operations.

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.

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