apache/paimon
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A well-known project done right. Strong docs and solid engineering throughout.

Top 16% of 5,156 graded repos

Apache Paimon is a lake format that enables building a Realtime Lakehouse Architecture with Flink and Spark for both streaming and batch operations.

Documentation88
Engineering86
Health94
Java3,305Apache-2.01mo ago

Top fixes

Highest-impact changes first, ranked by point weight

8 to address
  1. 1
    Tests18pt

    Wire your tests to a documented command (e.g. a test script in your build config) so the suite is reproducible.

  2. 2
    CI/CD14pt

    Add a lint step to catch style issues automatically.

  3. 3
    CI/CD14pt

    Upload coverage to Codecov, Coveralls, or report it with `--coverage` flags.

  4. 4
    README12pt

    Show a quick-start snippet so contributors can see what using your project looks like.

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Scorecard

Every check, grouped by category and sorted worst-first

Documentation

88

Contributing guide5pt77

CONTRIBUTING guide found.

README12pt85

README is present.

Install and run instructions9pt90

README documents how to install the project.

License6pt100

Licensed under Apache-2.0.

Engineering

86

Tests18pt80

Test files detected (docs/docs/concepts/spec).

Reproducibility6pt80

Lockfile present (docs/yarn.lock). Installs are reproducible.

CI/CD14pt85

CI is configured (.github/workflows/check-licensing.yml).

Linting and formatting5pt100

Java/Kotlin linting configured (tools/maven/checkstyle.xml).

Issue and PR templates6pt100

Issue or PR templates present.

Project health

94

Housekeeping3pt60

.gitignore present.

Dependency manifest6pt100

Dependency manifest found (pom.xml).

Repository metadata5pt100

Repository has a description.

Activity5pt100

Actively maintained (pushed within the last month).

Repository health signals

Activity, community, and responsiveness at scan time

Activity

  • -
    Commits (30d / 90d)
  • 1,334
    Forks
  • 0
    Releases

Community

  • -
    Community health
  • -
    authors own >50% of commits
  • 3,305
    Watchers

Responsiveness

  • 1d 1h
    Median issue response
  • 22h
    Median PR merge time
  • 683
    Open issues
Repository files44 root entries
  • .github
    Good: CI is configured (.github/workflows/check-licensing.yml).
    Good: Issue or PR templates present.
  • .idea
    Issue: Build artifacts or local files may be committed (.idea/icon.png) (−40 pts).Fix: Remove them and add to .gitignore.
  • .mvn
  • docs
    Good: CONTRIBUTING guide found.
    Issue: CONTRIBUTING guide contents could not be read (−28 pts vs a readable file).Fix: Move the file to the repo root or docs/CONTRIBUTING.md so its setup, style, test, and PR sections can be graded.
    Good: Test files detected (docs/docs/concepts/spec).
    Good: Lockfile present (docs/yarn.lock). Installs are reproducible.
  • licenses
  • paimon-api
  • paimon-arrow
  • paimon-benchmark
  • paimon-bundle
  • paimon-codegen
  • paimon-codegen-loader
  • paimon-common
  • paimon-core
  • paimon-docs
  • paimon-e2e-tests
    Good: Environment pinned via paimon-e2e-tests/src/test/resources-filtered/docker-compose.yaml.
  • paimon-filesystems
  • paimon-flink
  • paimon-format
  • paimon-hive
  • paimon-iceberg
  • paimon-lance
  • paimon-lumina
  • paimon-mosaic
  • paimon-python
  • paimon-service
  • paimon-spark
  • paimon-tantivy
  • paimon-test-utils
  • paimon-vector
  • paimon-vfs
  • paimon-vortex
  • tools
    Good: Java/Kotlin linting configured (tools/maven/checkstyle.xml).
  • .asf.yaml
  • .gitignore
    Good: .gitignore present.
  • .gitmodules
  • .scalafmt.conf
  • AGENTS.md
  • CODE_OF_CONDUCT.md
    Good: Code of conduct present.
  • copyright.txt
  • LICENSE
    Good: Licensed under Apache-2.0.
  • NOTICE
  • pom.xml
    Good: Dependency manifest found (pom.xml).
  • README.md
    Good: README is present.
    Good: README is well structured with multiple sections.
    Good: README includes screenshots or visuals. Great for first impressions.
    Issue: README has no code examples (−15 pts).Fix: Show a quick-start snippet so contributors can see what using your project looks like.
    Good: README links to a live demo or deployed app.
    Good: README includes status badges.
    Good: README documents how to install the project.
    Good: README documents how to run the project.
  • SECURITY.md
    Good: Security policy present.
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