apache/beam

[Task]: Update Python slowly updating side input example

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#35,935 opened on Aug 21, 2025

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P2good first issuepythontaskwebsite

Description

What needs to happen?

https://beam.apache.org/documentation/patterns/side-inputs/ is missing a side input pattern for Python

When doing this, we should factor in https://github.com/apache/beam/issues/35934 (and probably use Latest.Globally.without_defaults() and test on Dataflow)

Issue Priority

Priority: 2 (default / most normal work should be filed as P2)

Issue Components

  • Component: Python SDK
  • Component: Java SDK
  • Component: Go SDK
  • Component: Typescript SDK
  • Component: IO connector
  • Component: Beam YAML
  • Component: Beam examples
  • Component: Beam playground
  • Component: Beam katas
  • Component: Website
  • Component: Infrastructure
  • Component: Spark Runner
  • Component: Flink Runner
  • Component: Samza Runner
  • Component: Twister2 Runner
  • Component: Hazelcast Jet Runner
  • Component: Google Cloud Dataflow Runner

Contributor guide

Tech stack
pythonhtmlcss
Domain
documentationdata
Issue type
documentation
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-2 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
Apache Beam Python SDK basicsSide inputs conceptGCP Dataflow testing setup
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
45
Research direction
The issue requires adding a slowly updating side input example for Python on the Beam website. First, review the existing page at https://beam.apache.org/documentation/patterns/side inputs/ to understand the current structure. Then, examine issue #35934 which likely introduces Latest.Globally.without defaults() and should be factored in. After implementing the Python example, test it on Dataflow to ensure correctness. Check comments for any additional guidance from maintainers.