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 established NoSQL database that gives a versatile schema version.
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3. META. for the RegionServer responsible for handling the key. 4. 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.
Starting with one region, when the region becomes too large, it is split into two at the middle key, creating approximately two equal halves, as shown in Figure 2-23. Figure 2-23. Region splitting HBase has a master/slave architecture. The slaves are called RegionServers, with each RegionServer being responsible for a set of regions, and with each region being served by one RegionServer only. The HBase Master coordinates the HBase cluster’s administrative operations. At startup, each region is assigned to a RegionServer and the Master may move a region from one RegionServer to the other for load balancing.
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. The data is first written to a WAL called HLog. 2. The data is written to an in-memory MemStore. 3. When memory exceeds certain threshold, data is flushed to disk as HFile (also called a StoreFile). 4. HBase merges smaller HFiles into larger HFiles with a process called compaction.
Apache HBase Primer by Deepak Vohra