An Introduction to HBase

In our last two blogs, we talked about the HDFS Cluster & Zookeeper Cluster. Which is needed for deploying OpenTSDB in clustered mode. Continuing to the series, In this blog, we are going to talk about HBase which will be used by OpenTSDB in the cluster to store data.

HBase is a column-oriented NoSQL database management system that runs on top of Hadoop Distributed File System (HDFS).

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Redis : A Caching Database

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Redis stands for Remote Dictionary Server. It is opensource, in-memory key value data strucure store, which is extremely fast. In other words, it can also called as caching no sql database.
So, Redis is no sql database which can be used as a cache or message broker. The data structure supported by it are lists, hashes, strings, sets, sorted sorts with range queries, bitmaps, hyperloglogs and geo spatial indexes with radius queries. It has built in replication, Lua scripting, LRU eviction, transcations and different levels of one-disk persistence. It also provides high availiblity via Redis Sentinel and automatic partitioning with Redis cluster.

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