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spark

Innocent Iguana answered on January 21, 2023 Popularity 3/10 Helpfulness 9/10

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- General purpose data processing engine designed for big data.
- Written in scala
- Spark is a platform for cluster computing.
- Spark lets you spread data and computations over clusters with multiple nodes (each node as a separate computer). 
- Very large datasets are split into smaller datasets and  each node only works with a small amount of data.
- Data processing and computation are performed in parallel over the nodes in the cluster. 
- However, with greater computing power comes greater complexity.
- Can be used for Analytics, Data Integration, Machine learning, Stream Processing.
- Master and Worker:
    - Master: 
        - Connected to the rest of the computers in the cluster, which are called worker
        - sends the workers data and calculations to run
    - Worker: 
        - They send their results back to the master.
- Spark's core data structure is the Resilient Distributed Dataset (RDD)
- Instead of RDDs, it is easier to work with Spark DataFrame abstraction built on top of RDDs ( Operations using DataFrames are automatically optimized.)
- spark dataframes are immutable, you need to return a new instance after modification 
- You start working with `SparkSession` or `SparkContext` entrypoint
- 2 modes:
    - local mode : Single computer
    - cluster mode : cluster computers
    - You first build in local mode and deploy in cluster mode (no code change is required)
- Spark shell : 
    - interactive environment for spark jobs
    - allow interacting with data on disk or in memory

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Contributed on Jan 21 2023

Innocent Iguana

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Contributed on Apr 25 2023

Yawning Yacare

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