[jira] [Commented] (HADOOP-12910) Add new FileSystem API to support asynchronous method calls

["Steve Loughran (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HADOOP-12910?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15188967#comment-15188967 ] 

Steve Loughran commented on HADOOP-12910:
-----------------------------------------

# I'm going to be ruthless and say "I'd like to see a specification of this alongside the existing one". Because that one has succeeded in being a reference point for everyone; we need to continue that for a key binding. It should be straightforward here.

# Is it the future that raises an IOE, or the operation? I can see both needing to
# assuming this is targed @ Hadoop 3, it'd be nice to make sure this works really well with the Java 8 language features; maybe this could be the first use in the codebase.


> Add new FileSystem API to support asynchronous method calls
> -----------------------------------------------------------
>
>                 Key: HADOOP-12910
>                 URL: https://issues.apache.org/jira/browse/HADOOP-12910
>             Project: Hadoop Common
>          Issue Type: New Feature
>          Components: fs
>            Reporter: Tsz Wo Nicholas Sze
>            Assignee: Xiaobing Zhou
>
> Add a new API, namely FutureFileSystem (or AsynchronousFileSystem, if it is a better name).  All the APIs in FutureFileSystem are the same as FileSystem except that the return type is wrapped by Future, e.g.
> {code}
>   //FileSystem
>   public boolean rename(Path src, Path dst) throws IOException;
>   //FutureFileSystem
>   public Future<Boolean> rename(Path src, Path dst) throws IOException;
> {code}
> Note that FutureFileSystem does not extend FileSystem.



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