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https://issues.apache.org/jira/browse/BEAM-10450?focusedWorklogId=457462&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-457462
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ASF GitHub Bot logged work on BEAM-10450:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 11/Jul/20 01:19
Start Date: 11/Jul/20 01:19
Worklog Time Spent: 10m
Work Description: robertwb commented on pull request #12226:
URL: https://github.com/apache/beam/pull/12226#issuecomment-656958029
> Alternatively, flattens with no inputs could be roots?
I actually thought about this, but figured this way is more future-proof in
case there are any other corner cases like this that come up (especially as the
symptoms are non-obvious). This also preserves existing behavior (e.g.
start/finishBundle are never invoked for this empty PCollection, though wether
that's OK by the model is an ambiguity best left to the list).
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Issue Time Tracking
-------------------
Worklog Id: (was: 457462)
Time Spent: 0.5h (was: 20m)
> Java + Universal Local Runner: flattens with no PCollections on input hang
> --------------------------------------------------------------------------
>
> Key: BEAM-10450
> URL: https://issues.apache.org/jira/browse/BEAM-10450
> Project: Beam
> Issue Type: Bug
> Components: runner-universal, sdk-java-core, sdk-java-harness
> Reporter: Kenneth Knowles
> Assignee: Robert Bradshaw
> Priority: P2
> Time Spent: 0.5h
> Remaining Estimate: 0h
>
> On https://github.com/apache/beam/pull/11792/ the following tests failed and
> were sickbayed:
> {code}
> excludeTestsMatching
> 'org.apache.beam.sdk.transforms.FlattenTest.testEmptyFlattenAsSideInput'
> excludeTestsMatching
> 'org.apache.beam.sdk.transforms.FlattenTest.testFlattenPCollectionsEmpty'
> excludeTestsMatching
> 'org.apache.beam.sdk.transforms.FlattenTest.testFlattenPCollectionsEmptyThenParDo'
> {code}
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