What Is A Data Lake? Architecture And Tools
Tags: data, datalake
Published: 2023-08-11 09:56:53

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In an information-saturated world, many companies learn to benefit from the gigantic amount of data around us. Data is everywhere: millions of posts and breaking news are published and shared every single day. Internet users visit thousands of websites and make millions of purchases, leaving their digital footprint behind. Stock markets fluctuate, and the behavior of investors changes. It’s not a surprise that companies try to use this information to address their customers in a better way, make more informed business decisions, and predict changes.

While big data solutions often require considerable investments, decision-makers are still excited to take advantage of the opportunities they offer. Let’s take a look at statistics first.

## Statistics and Market Overview

Big data analytics market is maintaining steady growth in recent years. Cloud computing plays a leading role in this big data transformation.

Many industries apart from information technology are processing data to improve workflows and gain competitive advantage. Healthcare, finance, agriculture, professional services, and many other industries implement big data solutions. The transformation is happening across all industries, and even small businesses nowadays often subscribe to AI products to gain access to professional data analytics.

In order to cut costs, developers use other platforms or ready big data infrastructure. Almost all big data solutions use ready platforms for data lakes as well as the data processing tools created by industry giants like AWS, Microsoft, IBM, and others. In this article, we are talking about a data lake, a solution that allows us to cut costs significantly.

## Definition of a Data Lake

A data lake is a repository used to store large amounts of data in its original format and process this data accordingly. A big part of this data is unstructured, which makes data lake a powerful and essential part of real-time big data solutions. A data lake has a complex architecture that requires the right approach not only to make it work but also to minimize costs.

## Data Lake vs Data Warehouse

In data analytics, there’s no set-in-stone terminology, so some people might even use these terms interchangeably. However, most of the community agrees that there is a certain list of features that defines a data lake. Let’s take a look at them and compare them with the same list for a data warehouse.

## DATA LAKE

Stores mostly unstructured data
No preprocessing is required before storage
Low-cost storage of huge amount of data
Data is used for big data, AI, statistical analytics, predictions

## DATA WAREHOUSE

Stores structured data
Data has to be processed before storage
Storage is more expensive
Data is used for reports, dashboards, business intelligence



## The Architecture of a Data Lake

Essentially, there’s no set architecture for a data lake. Each data lake has its unique architecture consisting of tools, processes, and pipelines that power the data processing solution. This creates a powerful operating structure for processing big data.

However, we attempted to draw up the main aspects and processes of a typical data lake architecture. Usually, when architects model a data lake, they consider the following parameters:

## DATA INGESTION

The data can arrive at a data lake from different sources and through different paths. There are typically two different data flows: real-time and batch. Real-time processing allows data scientists to train ML models and get data incredibly fast. Batch data processing is slower but more accurate than real-time processing. It has a latency of several hours and can be used for reports or dashboards.

## DATA STORAGE

Developers need to consider which repository will store all the data. The data can be stored in a different form depending on its schema. Big data software developers usually have to buy cloud storage space provided by cloud service providers or use ready storage solutions provided by the industry giants like Apache, Snowflake, AWS, Azure, and others.

## DATA PROCESSING

Data lakes should have data processing tools that convert unstructured data into structured data. Then, this data can be used for analysis and gaining insights. Cleaning and categorizing data is also a part of data processing. Each data lake has several data processing pipelines depending on the data processing model (real-time or batch).

## DATA GOVERNANCE

Data Governance includes a whole philosophy on how a company uses data. Setting the right access management and implementing robust data security measures are the key steps. Then, it’s important to implement processes of data backup and disposal. Of course, the data governance policy should comply with the data regulations of your jurisdiction.

## Conclusion
It looks like the world is moving towards better data management, and data lake is a key component in this journey. Data lakes are used as cost-effective and efficient repositories that can store different kinds of data. It’s an essential part of the architecture of big data solutions. Data lakes allow developers and stakeholders to work with huge volumes of data effectively.

Author: Irene Mikhailouskaya

Irene is a Data Analytics Researcher. Covering the topic since 2017, she is an expert in business intelligence, big data analytics, data science, data visualization, and data management. Irene writes a lot about complex data analytics topics such as practical applications of data science, data quality management approaches, and big data implementation challenges.

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