What is Hadoop | Spark | Storm ?

1.What is Hadoop?

Hadoop is a framework that allows you to first store Big Data in a distributed environment, so that, you can process it in parallel. There are basically two components in Hadoop:

Evolution of Hadoop

In 2003, Doug Cutting launches project Nutch to handle billions of searches and indexing millions of web pages. Later in Oct 2003 – Google releases papers with GFS (Google File System). In Dec 2004, Google releases papers with MapReduce. In 2005, Nutch used GFS and MapReduce to perform operations. In 2006, Yahoo created Hadoop based on GFS and MapReduce with Doug Cutting and team. You would be surprised if I would tell you that, in 2007 Yahoo started using Hadoop on a 1000 node cluster.


When to use Hadoop ? 

Hadoop is used for:
  • Search – Yahoo, Amazon, Zvents
  • Log processing – Facebook, Yahoo
  • Data Warehouse – Facebook, AOL
  • Video and Image Analysis – New York Times, Eyealike
Till now, we have seen how Hadoop has made Big Data handling possible. But there are some scenarios where Hadoop implementation is not recommended.

When not to use Hadoop?

Following are some of those scenarios:
  • Low Latency data access: Quick access to small parts of data
  • Multiple data modification: Hadoop is a better fit only if we are primarily concerned about reading data and not modifying data.
  • Lots of small files: Hadoop is suitable for scenarios, where we have few but large files.
After knowing the best suitable use-cases, let us move on and look at a case study where Hadoop has done wonders.

2. What is Spark:
Apache Spark is an open-source cluster computing framework for real-time processing. It is of the most successful projects in the Apache Software Foundation. Spark has clearly evolved as the market leader for Big Data processing. Today, Spark is being adopted by major players like Amazon, eBay, and Yahoo! Many organizations run Spark on clusters with thousands of nodes. We are excited to begin this exciting journey through this Spark Tutorial blog. This blog is the first blog in the upcoming Apache Spark blog series which will include Spark Streaming, Spark Interview Questions, Spark MLlib and others.
When it comes to Real Time Data Analytics, Spark stands as the go-to tool across all other solutions. Through this blog, I will introduce you to this new exciting domain of Apache Spark and we will go through a complete use case, Earthquake Detection using Spark.

Real Time processing in Hadoop and Spark:

Hadoop is based on batch processing of big data. This means that the data is stored over a period of time and is then processed using Hadoop. Whereas in Spark, processing can take place in real-time. This real-time processing power in Spark helps us to solve the use cases of Real Time Analytics we saw in the previous section. Alongside this, Spark is also able to do batch processing 100 times faster than that of Hadoop MapReduce (Processing framework in Apache Hadoop). Therefore, Apache Spark is the go-to tool for big data processing in the industry.


3. What is Apache Storm?

Apache Storm is a distributed real-time big data-processing system. Storm is designed to process vast amount of data in a fault-tolerant and horizontal scalable method. It is a streaming data framework that has the capability of highest ingestion rates. Though Storm is stateless, it manages distributed environment and cluster state via Apache Zookeeper. It is simple and you can execute all kinds of manipulations on real-time data in parallel.
Apache Storm is continuing to be a leader in real-time data analytics. Storm is easy to setup, operate and it guarantees that every message will be processed through the topology at least once.


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