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https://issues.apache.org/jira/browse/BEAM-3484?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16333005#comment-16333005
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Chamikara Jayalath commented on BEAM-3484:
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[~iemejia] is this something you are interested in looking into ? Feel free to
unassign if not.
cc: [~jbonofre]
> HadoopInputFormatIO reads big datasets invalid
> ----------------------------------------------
>
> Key: BEAM-3484
> URL: https://issues.apache.org/jira/browse/BEAM-3484
> Project: Beam
> Issue Type: Bug
> Components: sdk-java-extensions
> Reporter: Łukasz Gajowy
> Assignee: Chamikara Jayalath
> Priority: Major
> Attachments: result_sorted1000000, result_sorted600000
>
>
> For big datasets HadoopInputFormat sometimes skips/duplicates elements from
> database in resulting PCollection. This gives incorrect read result.
> Occurred to me while developing HadoopInputFormatIOIT and running it on
> dataflow. For datasets smaller or equal to 600 000 database rows I wasn't
> able to reproduce the issue. Bug appeared only for bigger sets, eg. 700 000,
> 1 000 000.
> Attachments:
> - text file with sorted HadoopInputFormat.read() result saved using
> TextIO.write().to().withoutSharding(). If you look carefully you'll notice
> duplicates or missing values that should not happen
> - same text file for 600 000 records not having any duplicates and missing
> elements
> - link to a PR with HadoopInputFormatIO integration test that allows to
> reproduce this issue. At the moment of writing, this code is not merged yet.
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