1. When should we use hbase ?

when we need to work with billions of rows and millions of columns, hbase is the best.

2. difference b/w hbase and hdfs ?

HDFS is a distributed file system for storing and managining large data across clusters. HBase is built on top of HDFS and provides fast record lookups (and updates) for large tables.

3.why to use Hbase?

High capacity storage system.
Distributed design to cater large tables.
Column-Oriented Stores.
Horizontally Scalable.
High performance & Availability.
supports random real time CRUD operations.

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