[jira] [Created] (BEAM-2751) Write PCollection elements to individual files

["Christopher Hebert (JIRA)" <ji...@apache.org>]

Christopher Hebert created BEAM-2751:
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             Summary: 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: Davor Bonaci


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
...
modifedFileNamesAndBytes.apply("Write", WholeFileIO.write().to("/path/to/output/dir/"));
{code}




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