# japila-books/apache-spark-internals

The Internals of Apache Spark

Repository: https://github.com/japila-books/apache-spark-internals
Canonical: https://ross.abutalabs.com/products/apache-spark-internals
Homepage: https://books.japila.pl/apache-spark-internals
Language: Shell
License: Apache-2.0
License Family: permissive
Topics: apache-spark, spark, book, internals
Last push: 2026-07-18T21:39:41+00:00

## Health v2 (maintenance only)
Score: 83/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 93, release rhythm 61, longevity 100
- inputs: {"age_days": 4020, "days_push": 46, "days_rel": 46, "gap_med": 281, "n_releases_24m": 4}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1549, forks 456 (observed 2026-08-28T04:05:01.989952+00:00)

## What it is
An open-source online book, 'The Internals of Spark Core', that deep-dives into Apache Spark's internal architecture and source code. It is part of Jacek Laskowski's 'The Internals Of' book series and is published via GitHub Pages.

## Use cases
- understand how Spark Core works internally
- learn Spark internals before a data engineering interview
- deep dive into Spark execution architecture
- study Spark source code behavior
- reference Spark Core concepts while debugging Spark jobs

## When to choose
- you want a free, in-depth explanation of Spark Core internals
- you are an experienced Spark user moving to advanced/architecture topics
- you want a book-style reference tied to a specific Spark version

## When to avoid
- you need a beginner tutorial for getting started with Spark
- you need official API documentation
- you need hands-on exercises or a structured course

## Facets
- artifact type: learning-resource
- maturity: active
- function: documentation
- domain: big-data, microservices, tutorials
- platform: jvm, python
- tags: apache-spark, spark-core, online-book, internals, deep-dive, data-engineering

## Member repositories
- japila-books/apache-spark-internals (main) score 83

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:05:01.989952+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T04:30:23.020561+00:00, confidence not recorded.
  - readme: https://github.com/japila-books/apache-spark-internals (fetched 2026-08-28T04:05:01.989952+00:00, sha 477d47e724a2)
  - homepage: https://books.japila.pl/apache-spark-internals (fetched 2026-08-29T11:31:04.511023+00:00, sha ea282025d495)
  - site_page: https://books.japila.pl/apache-spark-internals/features (fetched 2026-08-29T11:31:04.513605+00:00, sha 2d482243b494)
- Data as of 2026-08-30T08:39:29.467469+00:00.