Category : Hadoop | Sub Category : Apache HBase | By Prasad Bonam Last updated: 2023-07-12 05:31:30 Viewed : 320
Key concepts in Apache HBase:
Apache HBase is a distributed, scalable, and high-performance NoSQL database built on top of the Hadoop ecosystem. It provides real-time read/write access to large datasets with high scalability and fault tolerance. Here are some key concepts in Apache HBase:
Tables: HBase organizes data into tables, which are similar to tables in a relational database. A table consists of rows and columns. Each row is uniquely identified by a row key, and columns within a row are grouped into column families.
Column Families: Columns in HBase are grouped into column families. A column family is a logical grouping of columns that are often accessed together. Each column family has a unique name and can contain an arbitrary number of columns.
Rows: Rows in HBase are uniquely identified by a row key. The row key is used to retrieve individual rows or ranges of rows efficiently. Rows can have multiple column families, and each cell in a row is identified by its column family, column qualifier, and timestamp.
Regions: HBase partitions data into regions for scalability. Each region contains a contiguous range of rows based on their row key. Regions are distributed across the HBase cluster, allowing for parallel processing and load balancing.
HBase Shell: HBase provides a command-line interface called the HBase Shell, which allows you to interact with HBase using commands. You can create tables, insert data, query data, and perform administrative tasks using the HBase Shell.
HBase API: HBase provides a Java API for programmatic access to HBase. You can use the API to create, read, update, and delete data in HBase tables. The API includes classes and methods for managing connections, performing CRUD operations, scanning data, and more.
HBase Master: The HBase Master is responsible for coordinating and managing the HBase cluster. It assigns regions to region servers, handles load balancing, and monitors the health of the cluster.
Region Servers: Region servers are responsible for serving data stored in HBase regions. Each region server manages multiple regions and handles read and write requests from clients. Region servers store data in the underlying Hadoop Distributed File System (HDFS).
ZooKeeper: HBase relies on Apache ZooKeeper for coordination and distributed synchronization. ZooKeeper helps in electing the HBase Master, managing cluster metadata, and maintaining cluster state.
HBase Coprocessors: HBase allows you to extend its functionality by writing custom code called coprocessors. Coprocessors can be added to perform additional processing or execute custom logic within the HBase region server.
These are some of the fundamental concepts in Apache HBase. It is worth noting that HBase has many advanced features and configuration options to optimize performance, manage data replication, handle backups, and support integration with other components of the Hadoop ecosystem.