This tutorial gives you an overview and talks about the fundamentals of Apache Spark.
The Spark project consists of multiple components:- Spark core and Resilient distributed datasets(RDD’s), Spark SQL, Spark Streaming, MLlib Machine learning library and GraphX.
Spark Core is the foundation of the overall project. It provides distributed task dispatching, scheduling, and basic I/O functionalities. The fundamental programming abstraction is called Resilient Distributed Datasets, a logical collection of data partitioned across machines. RDDs can be created by referencing datasets in external storage systems, or by applying coarse-grained transformations (e.g. map, filter, reduce, join) on existing RDDs.The RDD abstraction is exposed through a language-integrated API in Java, Python, Scala similar to local, in-process collections. This simplifies programming complexity because the way applications manipulate RDDs is similar to manipulating local collections of data.
Spark SQL is a component on top of Spark Core that introduces a new data abstraction called Schema RDD, which provides support for structured and semi-structured data. Spark SQL provides a domain-specific language to manipulate SchemaRDDs in Scala, Java, or Python. It also provides SQL language support, with command-line interfaces and ODBC/JDBC server.
Spark Streaming leverages Spark Core’s fast scheduling capability to perform streaming analytics. It ingests data in mini-batches and performs RDD transformations on those mini-batches of data. This design enables the same set of application code written for batch analytics to be used in streaming analytics, on a single engine.
MLlib is a distributed machine learning framework on top of Spark that because of the distributed memory-based Spark architecture is, according to benchmarks done by the MLlib developers, ten times as fast as Hadoop disk-based Apache Mahout and even scales better than Vowpal Wabbit. It implements many common machine learning and statistical algorithms to simplify large scale machine learning pipelines, including:
This article is just an overview to enlighten you over Apache Spark software. The Spark training sessions are however designed to be more composed, knowledgeable and in-depth.