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https://issues.apache.org/jira/browse/HDFS-9924?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15293942#comment-15293942
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Tsz Wo Nicholas Sze commented on HDFS-9924:
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> ... The Hadoop 2.8 release has been blocked for a very, very long time. ...
I guess you might have misunderstood the release process. The release manager
could include/exclude any feature as she/he pleases.
> Programmers who are familiar with Node.js will want something that supports
> callback chaining, ....
Good point! On the other hand, programmers who are NOT familiar with Node.js
may NOT want something that supports callback chaining.
Also, you might not have noticed, supporting Future is a step toward supporting
CompletableFuture.
> If we are going to backport this to branch-2, we should do it once the
> feature is done, rather than backporting bits and pieces as we go. ...
I disagree. Async HDFS is a collections of async methods. We don't not have
to support all the methods at day one.
> [umbrella] Asynchronous HDFS Access
> -----------------------------------
>
> Key: HDFS-9924
> URL: https://issues.apache.org/jira/browse/HDFS-9924
> Project: Hadoop HDFS
> Issue Type: New Feature
> Components: fs
> Reporter: Tsz Wo Nicholas Sze
> Assignee: Xiaobing Zhou
> Attachments: AsyncHdfs20160510.pdf
>
>
> This is an umbrella JIRA for supporting Asynchronous HDFS Access.
> Currently, all the API methods are blocking calls -- the caller is blocked
> until the method returns. It is very slow if a client makes a large number
> of independent calls in a single thread since each call has to wait until the
> previous call is finished. It is inefficient if a client needs to create a
> large number of threads to invoke the calls.
> We propose adding a new API to support asynchronous calls, i.e. the caller is
> not blocked. The methods in the new API immediately return a Java Future
> object. The return value can be obtained by the usual Future.get() method.
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