[jira] [Assigned] (BEAM-3268) getPerDestinationOutputFilenames() is getting processed before write is finished on dataflow runner

["Kamil Szewczyk (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/BEAM-3268?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Kamil Szewczyk reassigned BEAM-3268:
------------------------------------

    Assignee: Chamikara Jayalath  (was: Thomas Groh)

> 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: Chamikara Jayalath
>         Attachments: comparison.png
>
>
> 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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