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From "Davor Bonaci (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (BEAM-2751) Write PCollection elements to individual files
Date Thu, 24 Aug 2017 20:59:00 GMT

     [ https://issues.apache.org/jira/browse/BEAM-2751?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Davor Bonaci reassigned BEAM-2751:
----------------------------------

    Assignee: Eugene Kirpichov  (was: Davor Bonaci)

> Write PCollection elements to individual files
> ----------------------------------------------
>
>                 Key: BEAM-2751
>                 URL: https://issues.apache.org/jira/browse/BEAM-2751
>             Project: Beam
>          Issue Type: New Feature
>          Components: sdk-java-core
>            Reporter: Christopher Hebert
>            Assignee: Eugene Kirpichov
>
> I'd like to write elements as individual files.
> Rather than smashing thousands of outputs into a handful of files as TextIO does (output-00000-of-00005,
output-00001-of-00005,...), I want to write each element into unique files.
> So if I used WholeFileIO from [BEAM-2750] to read in three files (hi.txt, what.txt, and
yes.txt) then I'd like to write the processed files out to individual files with user or data-defined
filenames (like hi-modified.txt, what-modified.txt, and yes-modified.txt).
> With a WholeFileIO, this would look like:
> {code:java}
> PCollection<KV<String, Byte[]>> fileNamesAndBytes = p.apply("Read", WholeFileIO.read().from("/path/to/input/dir/*"));
> ...
> // Do stuff that change contents and file names
> PCollection<KV<String, Byte[]>> modifedFileNamesAndBytes = ...
> ...
> modifedFileNamesAndBytes.apply("Write", WholeFileIO.write().to("/path/to/output/dir/"));
> {code}
> This ticket complements [BEAM-2750].



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