combust/mleap

Flaky tests "throttling" in GrpcSpec

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#573 opened on Sep 28, 2019

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Description

In transform row stream of TransformServiceSpec: https://travis-ci.org/combust/mleap/builds/590427424#L4478-L4493

[info] transform row stream 4479[info] - transforms rows in a stream 4480[info] throttling 4481[info] - throttles elements through the flow *** FAILED *** 4482[info] java.lang.AssertionError: assertion failed: expected OnNext(2), found OnNext(3)

Also previously disabled same for transform frame stream: https://github.com/combust/mleap/commit/46c1485033ef55bcaa9222beb1f61470284fc990

These are failing when the GrpcSpec is run. However, does disabling in TransformServiceSpec also disable the same cases for MleapExecutorSpec?

Contributor guide

Research direction
Inspect the flaky test 'throttling' in GrpcSpec and TransformServiceSpec. Examine the test setup, the throttling logic, and the commit that previously disabled similar tests. Trace the expected OnNext order to identify why it sometimes fails with unexpected OnNext(3).
Tech stack
scala
Domain
backendmachine learning
Issue type
Bug
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.
Half day
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Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
Scalasbt
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
60