Processing data

Capire il Data Engineering

Hadrien Lacroix

Content Developer at DataCamp

data pipeline

moving data to the data lake

moving data to the data lake

checking for corrupted data

A general definition

Data processing: converting raw data into meaningful information

Data processing value

Conceptually

Remove unwanted data
Optimize memory, process and network costs
Convert data from one type to another

At Spotflix

No long term need for testing feature data
Can't afford to store and stream files this big

data pipeline

data pipeline

data pipeline

Data processing value

Conceptually

Remove unwanted data
To save memory
Convert data from one type to another
Organize data
To fit into a schema/structure
Increase productivity

At Spotflix

No need for lossless format
Can't afford to store files this big
Convert songs from .flac to .ogg
Reorganize data from the data lake to data warehouses
Employee table example
Enable data scientists

How data engineers process data

Data manipulation, cleaning, and tidying tasks
- that can be automated
- that will always need to be done
Store data in a sanely structured database
Create views on top of the database tables
Optimizing the performance of the database

Rejecting corrupt song files
Deciding what happens with missing metadata
Separate artists and albums tables...
...but provide view combining them
Indexing

¹ The difference between batch and stream will be explained in the next lesson!

Apache Spark logo

Summary

What data processing is
Why it's necessary
What it consists in
How we process data at Spotflix

Let's practice!

Capire il Data Engineering

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