Concurrent Data Processing in Elxir by The Pragmatic Programmer-01.png

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ch_5.1 RabbitMQ

Ch_5.2 RabbitMQ

Most engineers don’t think that concurrency is distinct from programming. Data processing includes transforming information in some way, like reporting, data aggregation, or analytics. On the other hand, concurrency involves significantly improving performance.

This course is designed to help you navigate the world of concurrency tools available in the Elixir ecosystem. You’ll explore popular modules and libraries like GenServer, GenStage, Flow, and Broadway. You’ll be able to ingest data, set up pipelines, and run concurrent processes with Elixir.

By the end of the course, you’ll have a wide range of new techniques to simplify your product, improve code performance, and make your application more resilient to increased workloads.

Concurrent Data Processing in Elixir

## Process restart values revisited

By default, `GenServer` processes are always restarted by their supervisor, which is the  `:permanent` setting. In our case, we intentionally shut down the process. However, `JobRunner` thinks something must have gone wrong, so it keeps restarting the process forever. We can easily fix this by using the **`:transient restart`** option, which tells the supervisor not to restart the process if it is exiting normally.

We have modified the `use GenServer` statement in `job.ex` file for the new setting:


# Process restart values revisited

By default, `GenServer` processes are always restarted by their supervisor, which is the  `:permanent` setting. In our case, we intentionally shut down the process. However, `JobRunner` thinks something must have gone wrong, so it keeps restarting the process forever. We can easily fix this by using the **`:transient restart`** option, which tells the supervisor not to restart the process if it is exiting normally.

We have modified the `use GenServer` statement in `job.ex` file for the new setting:


Learn about process restart values and restart frequency to control processes' shut downs and restarts.

Getting Started

Easy Concurrency with the Task Module

Long-Running Processes Using GenServer

Data Processing Pipelines with GenStage

Process Collections with Flow

Data Ingestion Pipelines with Broadway

Concluding the Course

Process Restart Values and Frequency

Process restart values revisited