[jira] [Created] (HADOOP-12311) Implement stream-based Filesystem API

["Victor Malov (JIRA)" <ji...@apache.org>]

Victor Malov  created HADOOP-12311:
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             Summary: Implement stream-based Filesystem API
                 Key: HADOOP-12311
                 URL: https://issues.apache.org/jira/browse/HADOOP-12311
             Project: Hadoop Common
          Issue Type: New Feature
          Components: fs
            Reporter: Victor Malov 
            Priority: Minor


After looking at Filesystem API, I couldn't find Stream-based API, which will be work well with Java lambda-functions and be able chain calls.

As Hadoop 3.0 is going to support JDK 8, I propose implement general stream-based Filesystem API similar to as implemented in Java SE 8:

static Stream<String> 	lines(Path path, Charset cs)

This probably will looks similar to this:
try (Stream<Path> stream = Files.list(Paths.get(""))) { 
    String joined = stream
                            . map(String::valueOf)
                            .filter(path -> !path.startsWith("."))
                            .sorted()
                            .collect(Collectors.joining("; "));
  System.out.println("List: " + joined);
}



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