Tag: spring

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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ThreadLocal and ExecutorService

Recently I have been working on some code in which I was using ThreadLocal variables. This give me possibility to chew over the ThreadLocal variables concept again. The basic idea of this approach is quite simple. Every thread has its own copy of a ThreadLocalMap. When you ask for the value of the ThreadLocal variable it will search for this value in the ThreadLocalMap variable instance of the current thread.

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