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https://issues.apache.org/jira/browse/HADOOP-12910?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15317891#comment-15317891
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Jitendra Nath Pandey commented on HADOOP-12910:
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+1 to use CompletableFuture in trunk. I see that a
CompletableFutureWithCallback needs to be defined only so that we can have a
FutureWithCallback in branch-2. We will need to evaluate how complicated that
gets, but if its too hard, I would suggest, not to backport the user-facing API
in branch-2 at all.
Since CompletableFuture implements Future, there is still no incompatibility
with the current code in branch-2. It is valid that branch-2 will not have all
the cool features of CompletableFuture, but some early experimenters may be
willing to live with that limitation, and will not run into incompatibility
once upgrade to trunk.
> 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
> Attachments: HADOOP-12910-HDFS-9924.000.patch,
> HADOOP-12910-HDFS-9924.001.patch, HADOOP-12910-HDFS-9924.002.patch
>
>
> 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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