apache/beam

java DataflowRunner should warn if the stagingLocation has a TTL

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#18,209 opened on Jun 3, 2022

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Description

We have seen a few customers run into a hard-to-track-down bug where the staging bucket has a TTL, but files get TTL-deleted when they are still needed.

This might be because of:

  1. Long lived batch jobs / streaming jobs can reference staged files arbitrarily later and will fail in bad ways if they have been deleted.
  2. Some customers even hit issues where the "check file already exists" succeeds when starting a job, but then the file is TTL-deleted before the job actually starts. (This sounds crazy, but may happen if TTL is 7 days and jobs run every 7 days, for example. Race condition.)

I'm hoping it's not hard to check that files would have TTLs and warn if so.

Imported from Jira BEAM-1507. Original Jira may contain additional context. Reported by: dhalperi.

Contributor guide

Research direction
Investigate how to check the lifecycle rules of a Google Cloud Storage bucket using the Google Cloud Storage client library. Specifically, look for methods to retrieve bucket metadata and examine lifecycle rules that set a Time to Live (TTL). Once identified, implement a warning in the DataflowRunner's staging location setup when a TTL is detected.
Tech stack
java
Domain
backend
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
Under 1 hour
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
JavaGoogle Cloud Storage
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
60