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https://issues.apache.org/jira/browse/HADOOP-12910?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15303295#comment-15303295
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Andrew Wang commented on HADOOP-12910:
--------------------------------------
We could shade Deferred so it's not an external dependency, or maybe even
copy-paste it into Hadoop. It's been pretty stable if you look at the commit
history:
https://github.com/OpenTSDB/async/commits/master/src/Deferred.java
bq. I suggest returning Future (or a sub-interface to support callbacks) in
branch 2 and CompletableFuture (or our own implementation of CompletableFuture)
in trunk. In this way, trunk is backward compatible to branch 2 since
CompletableFuture implements Future.
I like this suggestion. If there's demand for callbacks in branch-2 then we
might as well use Deferred everywhere, but if Future is sufficient for the
current set of usecases, then let's go with this plan.
> 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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