Thursday, 29 October 2015

What is the difference between Cassandra, Hadoop Big Data, MongoDB, CouchDB? Cassandra Interview Questions for Experinced

Interview Question: What is the difference between Cassandra, Hadoop Big Data, MongoDB, CouchDB?

Answer:
Hadoop

  • Is an entire ecosystem of integrated distributed computing tools, at the core of which are a file system (HDFS) and a programming framework (Map-Reduce).
Cassandra

  • Is a NoSQL data store based on a key-value pairing system, where value is then further structured into a columnar like store.

MongoDB

  • A NoSQL data store based on key-value pairing system where value is JSON documents.  Has its own unique querying language.

CouchDB

  • A NoSQL data store based on key-value pairing system where value is JSON documents.  Uses a combination of HTTP, Javascript, and map-reduce for querying.

Cassandra, Mongo, and Couch are pretty similar in that they are key-value based NoSQL data stores.  They each have their advantages and disadvantages.  If you're interested in one, you should probably at least have a good understanding of when to use one NoSQL vs another.

Hadoop is a much bigger in scope to learn than the others because it is comprised of many different components, including its own columnar (hBase) and SQL like data storage (Hive) platforms.

As a side note, I wouldn't pay a dime to "learn" these technologies.  They're all open source and there's no shortage of examples or documentation available for all of them.

Reference: Quora.com
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1 comment:

  1. Thanks for practical answers! I haven’t been reading such informative and instructive answers for a long time. Recently I have been interested of VDR technology for business and made some virtual data room (like Ideals) comparison in order to figure out what is better. I’d like to know what you think of this technology.

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