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https://issues.apache.org/jira/browse/BEAM-3268?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16554249#comment-16554249
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Jozef Vilcek commented on BEAM-3268:
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I believe I am facing this issue with windowed writes on Flink runner with Beam
2.5.0. Accessing files announced by FileIO write results in map function fails
from time to time and get's working by spinning some wait time.
Can it be that bug is still present for some cases?
> getPerDestinationOutputFilenames() is getting processed before write is
> finished on dataflow runner
> ---------------------------------------------------------------------------------------------------
>
> Key: BEAM-3268
> URL: https://issues.apache.org/jira/browse/BEAM-3268
> Project: Beam
> Issue Type: Bug
> Components: runner-dataflow
> Affects Versions: 2.3.0
> Reporter: Kamil Szewczyk
> Assignee: Eugene Kirpichov
> Priority: Major
> Fix For: 2.5.0
>
> Attachments: comparison.png
>
> Time Spent: 2h 10m
> Remaining Estimate: 0h
>
> While running filebased-io-test we found dataflow-runnner misbehaving. We run
> tests using single pipeline and without using Reshuffling between writing and
> reading dataflow jobs are unsuccessful because the runner tries to access the
> files that were not created yet.
> On the picture the difference between execution of writting is presented. On
> the left there is working example with Reshuffling added and on the right
> without it.
> !comparison.png|thumbnail!
> Steps to reproduce: substitute your-bucket-name wit your valid bucket.
> {code:java}
> mvn -e -Pio-it verify -pl sdks/java/io/file-based-io-tests
> -DintegrationTestPipelineOptions='["--runner=dataflow",
> "--filenamePrefix=gs://your-bucket-name/TEXTIO_IT"]' -Pdataflow-runner
> {code}
> Then look on the cloud console and job should fail.
> Now add Reshuffling to
> sdks/java/io/file-based-io-tests/src/test/java/org/apache/beam/sdk/io/text/TextIOIT.java
> as in the example.
> {code:java}
> .getPerDestinationOutputFilenames().apply(Values.<String>create())
> .apply(Reshuffle.<String>viaRandomKey());
> PCollection<String> consolidatedHashcode = testFilenames
> {code}
> and trigger previously used maven command to see it working in the console
> right now.
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