Spark 30 Big Data Essentials Scala Rock JVM Course

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What is Apache Spark?

Apache Spark is a free and open-source unified analytics engine designed to handle massive volumes of data. Spark is a cluster programming interface with implicit data parallelism and fault tolerance. The Spark codebase was created at the University of California, Berkeley's AMPLab, and then donated to the Apache Software Foundation, which has been responsible for its upkeep ever since. It is a multi-language engine that can execute data engineering, data science, and machine learning on single-node or clustered systems.

What is Scala?

Scala, which stands for "scalable language," is a multi-paradigm, high-level programming language with a strong static type system that is open source. Parameterization and abstraction are supported by its type system.

Scala is praised for its ability to combine functional and object-oriented features. As a result, every value is an object, every operator is a method, and functions may be passed around like variables. Scala offers a mixin composition that is versatile and modular, combining the benefits of mixins and characteristics (it allows programmers to reuse new class definitions that are not inherited). It also features a syntax that allows for anonymous and higher-order functions.

Spark and Scala collaborate to analyze large amounts of data. Spark, on the other hand, is unusual in that it has both batch and streaming capabilities, making it a popular choice for lightning-fast Big Data Analysis systems.

What is Big Data?

Big data refers to data sets that are too large or complex for standard data-processing application software to manage. Data with a large number of fields (rows) have more statistical power, but data with a large number of features or columns have a higher false discovery rate. Data collection, storage, analysis, search, sharing, transfer, visualization, querying, updating, information privacy, and data source are all problems in big data analysis. The three major elements of big data were first related to three essential concepts: volume, diversity, and velocity. Because huge data analysis introduces sampling problems, only observations and samples were previously permitted. As a result, big data frequently comprise vast amounts of data that standard software cannot manage in a fair amount of time or at a reasonable cost.

Some uses of Apache spark:

Stream processing- Application developers are increasingly dealing with "streams" of data, which include everything from log files to sensor data. This data arrives in a constant stream, often from many sources at the same time. While these data streams can be saved to disc and analyzed later, it is sometimes more practicable or necessary to review and act on the data as it is received. For example, financial transaction data streams may be analyzed in real-time to identify and reject – potentially fraudulent transactions.

Machine learning- Machine learning algorithms become increasingly practical and accurate as the amount of data collected grows. Software may be trained to recognize and respond to triggers within well-understood data sets before applying the same solutions to new and unknown data. Because of its ability to store data in memory and perform repeated queries fast, Spark is an excellent choice for training machine learning algorithms. Running broadly similar queries at a scale significantly decreases the time required to sort through a collection of alternative solutions and choose the most efficient methods.

Data integration- Data generated by different systems throughout a corporation is rarely clean or consistent enough to be easily integrated for reporting or analysis. ETL activities are frequently used to extract data from many systems, clean and standardize it, and then load it into a different system for analysis. Spark (and Hadoop) are gaining popularity for their ability to reduce the cost and time required for ETL.

What is new in Spark 3.0?

Spark 3.0 includes a slew of interesting additional features and performance enhancements. Here are five of the most promising:

Adaptive Query Execution (AQE) enhancements

In contrast to more traditional technologies, runtime adaptively in Spark is critical because it allows for the optimization of execution plans depending on input data. The reason this is so crucial in Spark is that the data itself influences the application's performance. Broadcasting is a fantastic example of the significance of dynamic adaption of execution strategies. If the table size permits it, the adaptive execution mode can convert a shuffle join to a broadcast join (i.e. if its size does not exceed that broadcast limit). For some data inputs, this may be possible; but, in other cases, it may not be. Data skewness is another good example of the relevance of AQE. When the Adaptive Query Execution option is enabled, the partitions utilized in future modifications can be changed dynamically.

Spark 3.0 brought two significant enhancements over Adaptive Query Execution that substantially simplifies Spark parameter tuning:

AQE now merges tiny partitions so that customers don't have to worry about shuffle partitions because this is now dynamically adjusted in runtime.

When data skewness is found, AQE automatically divides divisions into smaller ones.

Improvements on pandas UDF API

Pandas UDFs (User-Defined Functions) is one of the most important features added to Spark since version 2.3, allowing users to exploit the pandas API in Apache Spark.

The most recent Apache Spark version included a new interface for Pandas UDFs with Python-type hints. Pandas' UDFs were inconsistent and difficult to follow and/or utilize in their early iterations. In this regard, type hints provided in version 3.0 will undoubtedly aid in the elimination of developer misunderstanding.

New User Interface for Structured Streaming

The Web UI in Apache Spark 3.0 has an additional tab devoted to Structured Streaming, which facilitates monitoring of streaming workloads.

Currently, the statistics page of a specific streaming query provides five metrics:

Process Rate Input Rate

Rows of Input

Operation Duration Batch Duration

More than 30 new built-in functions

Spark 3.0 includes a slew of new built-in functions, ranging from bit counts to hyperbolic functions (e.g., hyperbolic sin/cos/tan) and CSV manipulations.

Hydrogen: Deep Learning improvements

It is commonly understood that vast volumes of data are required to train AI/ML models that perform very well. One of the most difficult difficulties in recent years has been ensuring interoperability between data processing frameworks (such as Spark) and distributed deep learning frameworks. While Spark jobs are divided into numerous distinct tasks, most Deep Learning frameworks employ very different logic for execution (e.g. tasks are dependent on each other).


The most recent major version of Spark has various features and performance enhancements, thus upgrading to the most recent version is unquestionably a sensible decision. This article only explored a portion of the new features in Apache Spark 3.0.

How much an Apache Spark developer earns?

To remain and flourish in your job, you must be able to quickly learn and adapt to changes. An entry-level Spark developer may expect to earn between Rs 6,00,000 and Rs 10,00,000 per year, whereas an experienced developer can expect to earn between Rs 25,00,000 and Rs 40,00,000.

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