apache/pulsar

Flaky-test: PulsarSinkE2ETest.testPulsarSinkDLQ

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#16,578 opened on Jul 13, 2022

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Stalearea/testhelp wantedtype/flaky-tests

Description

example failure

java.lang.AssertionError: expected object to not be null
  	at org.testng.Assert.fail(Assert.java:99)
  	at org.testng.Assert.assertNotNull(Assert.java:942)
  	at org.testng.Assert.assertNotNull(Assert.java:926)
  	at org.apache.pulsar.io.PulsarSinkE2ETest.testPulsarSinkDLQ(PulsarSinkE2ETest.java:195)

Contributor guide

Tech stack
java
Domain
testing
Issue type
bug
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.
half day
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
mostly clear
Prerequisites
familiarity with Apache PulsarJUnit testing experience
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
40
Research direction
The test PulsarSinkE2ETest.testPulsarSinkDLQ fails intermittently with a NullPointerException at line 195 because an expected object is null. Investigate the test setup and the Sink DLQ behavior to identify race conditions or missing waits. Review the test file at src/test/java/org/apache/pulsar/io/PulsarSinkE2ETest.java and consider adding proper synchronization or retry logic to eliminate flakiness.