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From "Allen Wittenauer (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-12311) Implement stream-based Filesystem API
Date Sun, 09 Aug 2015 21:47:46 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-12311?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14679366#comment-14679366
] 

Allen Wittenauer commented on HADOOP-12311:
-------------------------------------------

Shouldn't this really be added to FileContext instead of FileSystem?  Isn't the long term
plan to kill off FileSystem gradually?

> 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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