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    Explain Apache spark eco-system components: Spark SQL, Spark Streaming, Spark MLlib, and GraphX.
    In which scenarios we can use these components? what type of problems can be solved using them?



    Below are the Apache Spark ecosystem components:

    • Spark Core 
      Spark Core is the base of Spark for parallel and distributed processing of huge datasets. It is in charge of all the essential I/O functionalities, programming, and observance the roles on spark clusters. It is also responsible for task dispatching, and networking with different storage systems, fault tolerance, and economical memory management. It uses special collection referred to as RDD (Resilient Distributed Datasets).
    • Spark SQL
      SparkSQL is module/component in Apache Spark that is employed to access structured and semi-structured information. It is a distributed framework that is tightly integrated with varied spark programming like Scala, Python, and Java. It supports relative process in Spark programs via RDD further as on external data source. It is used for manipulating and taking information in varied formats. The means through that {we can|we will|we square measure able to} act with Spark SQL are SQL/HQL, DataFrame API, and Datasets API. It provides higher improvement.
      The main abstraction in SparkSQL is information sets that act on structured data. It translates ancient SQL and HiveQL queries into Spark jobs creating Spark accessible wide. It supports real-time data analytics, data streaming SQL.SparkSQL defines 3 varieties of function:

      1. Built-in perform or user-defined function: Object comes with some functions for column manipulation. Using Scala we are able to outlined user outlined perform.
      2. Aggregate Function: Operates on the cluster of rows and calculates one come back price per cluster.
      3. Window Aggregate: Operates on the cluster of rows and calculates one come back price every row in an exceeding cluster.

      Different type of APIs for accessing SparkSQL:
      SQL: Executing SQL queries or Hive queries, the result is going to become in the variety of DataFrame.

      1. DataFrame: It is similar to the relative table in SparkSQL. It is distributed the assortment of tabular information having rows and named column. It will perform filter, intersect, join, sort mixture and much more. It powerfully trusts options of RDD. As it trusts RDD, it is lazy evaluated and immutable in nature.
        DataFrameAPI is offered in Scala, Java, and Python.
      2. Datasets API: Dataset is new API to supply benefit of RDD because it is robust written and declarative in nature. Dataset is the assortment of object or records with the familiar schema. It should be modeled in some data structure. It offers improvement of DataFrames and static kind safety of Scala. We can convert information set to Data Frame.
    • Spark Streaming
      Spark Streaming is a light-weight API that permits developers to perform execution and streaming of information application. Discretized Streams kind the bottom abstraction in Spark Streaming. It makes use of an endless stream of {input information|input file|computer file} to method data in the time period. It leverages the quick programming capability of Apache Spark core to perform streaming analytics by ingesting information in mini-batches. Information in Spark Streaming is accepted from varied information sources and live streams like Twitter, Apache Kafka, IoT Sensors, Amazon response, Apache Flume, etc. in an event-driven, fault-tolerant, and type-safe applications.
    • Spark element MLlib
      MLlib in Spark stands for machine learning (ML) library. Its goal is to form sensible machine learning effective, ascendible and straightforward. It consists of some learning algorithms and utilities, as well as classification, regression, clustering, collaborative filtering, spatial property reduction, further as lower-level improvement primitives and higher-level pipeline genus Apis.
    • GraphX
      GraphX is a distributed graph process framework on prime of Apache Spark. because it is predicated on RDDs, that square measure immutable, graphs square measure immutable and so GraphX is unsuitable for graphs that require being updated, in addition to in an exceedingly transactional manner sort of a graph info.

    For more details, please read Apache Spark Eco-system.

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