Author: Hanna Grodzicka

When should I use blockchain?

Different cases require different solutions. Although blockchain’s main and still leading use case is cryptocurrencies, it gains popularity in other areas. One research points out that besides traditional banking and trading usage, blockchain applications are rarely known even among Computer Science students.

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Blockchain Trilemma

Blockchain characteristics are determined by their type and have particular implications. It is not an appropriate solution to use cases that necessitate a high level of privacy. If a solution is needed for a homogeneous environment where everyone trusts each other and has full control over the flow of data, and the environment itself is not exposed to any external threats – blockchain is going to be a very slow and disturbing database.
The technology becomes relevant if dealing with a lack of trust in the network. But before analysing specific blockchain use-cases, let’s break down the problems.

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Blockchain 101

In 2009 Satoshi Nakamoto released the first decentralised cryptocurrency – Bitcoin. It was the first implementation of blockchain technology.

Blockchain is mainly associated with cryptocurrency. Yet the specific blockchain type utilised for this relatively new financial use case is just a tip of an iceberg. Recent approaches incline towards enterprise usage. Employing blockchain into Supply Chain Management (SCM) enables to track product or service subsequent states in the business flow. Business partners can join the blockchain network to either read or write information to the ledger history.

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Deploying ETL on Amazon EMR

Amazon offers a lot of cloud-based services hence getting started with AWS can be tough. Which one to use? Services usually do not have expressive names and one might get even more confused when it comes to combining multiple services.

The idea was to deploy a Spring Boot application performing ETL (extract, transform, load). Any application can be deployed using EC2. But there is one special thing: it is a Spark application. Therefore we opted for EMR.

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