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What is Apache Spark?

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Apache Spark is a distributed analytics framework that can be used for many Big Data applications. It relies on in-memory data storage and parallel execution of processes to ensure high performance. It is one of the most comprehensive Big Data systems on the market and offers, among other things, batch processing, graph databases, or support for Machine Learning.

What is Apache Spark?

The framework was initially developed at the University of Berkeley in 2009 and has been open-source since then. This is one of the reasons why it is already used by many large companies such as Netflix, Yahoo, and eBay.

The prominent usage is also due to the fact that Apache Spark is a very broad framework for almost all Big Data applications. As a result, it is used by users for machine learning models, to create graph databases, or to process streaming data.

A fundamental feature of Spark is its distributed architecture, i.e. the use of computer clusters to redistribute peak loads. This means that even large volumes of data can be processed very efficiently and cost-effectively.

Which Components belong to Spark?

Spark provides components for a wide variety of data science applications. SparkCore is the brain of the Spark universe. This is where tasks are controlled and distributed, and basic functionality is provided.

The Machine Learning Library (MLlib) provides basic models for working with artificial intelligence. This includes the most common algorithms in this area such as Random Forest or K-Means Clustering.

Graphs are a modern type of data storage from the field of NoSQL databases. They can be used to store social networks or represent knowledge structures, for example. The creation and processing of such graphs in Spark are enabled by GraphX.

The data storage in Apache Spark is done by the so-called RDDs, which do not have any structure at first. However, they can be converted into so-called Spark DataFrames, which are very similar to Pandas’ DataFrames. With the help of SparkSQL, classic SQL queries can be executed on DataFrames, so that structured access to the data is possible.

In many applications, real-time data processing is required. For this purpose, so-called streams are set up in which data is written at irregular intervals. With the help of SparkStreaming, these data streams can be processed by combining them into smaller data packets.

Das Bild zeigt die vier Komponenten von Apache Spark nämlich MLlib, GraphX, SparkSQL und SparkStreaming.
Components of Apache Spark

What are Resilient Distributed Datasets?

The basic data structure of Apache Spark is Resilient Distributed Datasets (RDD) and because of their structure, data processing in Spark is also so much faster than in Hadoop. In short, it is a collection of data partitions to which you have read-only access. These partitions can be easily distributed across the different computers in the cluster. All components in Apache Spark are, in effect, designed to process and forward RDD files.

One of the characteristics is that the files cannot be changed after creation. This is only possible by creating a new RDD file and writing the changed data into it. The files are also kept in memory, which is one of the main reasons for Spark’s performance. However, RDD files can also be stored normally on a disk if desired.

What are the Benefits of using Spark?

Spark’s benefits can be summarized in three broad themes:

  1. Performance: Thanks to its distributed architecture, Spark is very scalable and offers outstanding performance when processing large amounts of data. The fact that many calculations take place in memory, i.e. in the main memory, accelerates the processes even more. In one test, Apache Spark was even found to be 100 times faster than Hadoop in certain calculations.
  2. Ease of use: Apache Spark is also very easy to use for newcomers, for example by reverting to already familiar structures, such as the DataFrame. In addition, many of the applications can be called via APIs.
  3. Unity: The wide range of applications that can be implemented with Apache Spark make it possible to perform various stages of data processing in a single tool. This ensures the compatibility of the different steps and there is no need to manage different licenses or access to programs.

Which Applications use Apache Spark?

Due to the many functionalities and components that Spark already offers, the tool has become quasi-standard for most Big Data applications. This includes all use cases in which large amounts of data are to be processed with high performance. The following applications are of particular interest:

  • Merging of different data sources and unification of information, e.g. in ETL context
  • Analysis of large data sets through the possibility of structured SQL queries and data stored in memory
  • Building basic machine learning models, which are already supported by Spark
  • Introducing and processing real-time data streams using SparkStreaming.

How is Spark different from Hadoop?

Apache Spark is considered an improvement on Hadoop in most sources because it can process large amounts of data much faster. The big advantage in the introduction of Hadoop was the use of the MapReduce algorithm. This splits complex computation into a Map and a Reduce phase, speeding up the process. However, it does so by relying on files that reside on disk. At this point, Spark draws its great performance advantage, since the data is mostly stored in memory. This is one of the reasons why Spark is up to 100 times faster than Hadoop, depending on the application.

Besides this main difference, there are other fundamental differences between Hadoop and Spark:

  • Performance: As already mentioned, Apache Spark works mainly out of memory, while Hadoop stores data on disk and processes it in batches.
  • Cost: Spark’s performance advantage naturally comes at a higher cost. Working memory is significantly more expensive compared to main memory (SSD or HDD).
  • Data processing: Both systems are based on a distributed architecture. However, Hadoop is optimized for batch processing and one-time processing of large amounts of data. Spark, on the other hand, is better suited for processing data streams through the SparkStreaming component.
  • Machine Learning: Apache Spark provides a simple way to use proven machine learning models quickly and easily through the Machine Learning Library.

These points come in large part from IBM’s detailed comparison between Spark and Hadoop. There you can find even more details about the differences between Hadoop and Spark.

What are the Differences between Presto and Spark?

Apache Presto is an open-source distributed SQL engine suitable for querying large amounts of data. It was developed by Facebook in 2012 and subsequently made open-source under the Apache license. The engine does not provide its own database system and is therefore often used with well-known database solutions, such as Apache Hadoop or MongoDB.

It is often mentioned in connection with Apache Presto or even understood as a competitor to it. However, the two systems are very different and share few similarities. Both programs are open-source available systems when working with Big Data. They can both offer good performance, due to their distributed architecture and the possibility of scaling. Accordingly, they can also be run both on-premise and in the cloud.

However, besides these (albeit rather few) similarities, Apache Spark and Apache Presto differ in some fundamental characteristics:

  • Spark Core does not support SQL queries, for now, you need the additional SparkSQL component for that. Presto, on the other hand, is a travel SQL query engine.
  • Spark offers a very wide range of application possibilities, for example, also through the possibility of building and deploying entire machine learning models.
  • Apache Presto, on the other hand, specializes primarily in the fast processing of data queries for large data volumes.

This is what you should take with you

  • Apache Spark is a distributed Big Data framework that can be used for a wide variety of use cases.
  • Spark consists of various components. These include GraphX, with which graphs can be created and processed, and the Machine Learning Library, which provides widespread ML algorithms for use.
  • The advantages include the high-performance processing of large amounts of data, user-friendliness, and the uniformity of the solution through the various components.
  • In practice, Spark is primarily used for data processing in the Big Data area and for reading out real-time data streams.

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