apache/beam

No python equivalent of org.apache.beam.sdk.transforms.Sample.any(100)?

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#18,552 opened on Jun 3, 2022

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Description

Java's org.apache.beam.sdk.transforms.Sample.any will return a PCollection with bounded size (filtering strategy). The closest python eqiuvalent is beam.Sample.FixedSizeGlobally(n) whover, this version uses a combiner strategy, returning a list with n elements; which does not scale if n is "bigger than what fits in memory".

Imported from Jira BEAM-3000. Original Jira may contain additional context. Reported by: rodrigob.

Contributor guide

Research direction
Investigate how to implement a bounded size sample transform in Python Beam, similar to Java's Sample.any. Explore possible implementations using a filtering strategy instead of the current combiner strategy.
Tech stack
pythonjava
Domain
backend
Issue type
Feature
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 BeamPython
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
40