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