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https://issues.apache.org/jira/browse/HDFS-9924?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15311199#comment-15311199
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Jitendra Nath Pandey commented on HDFS-9924:
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What is the expected timeframe for 2.8 release? Hopefully, we will settle on
the API by then. The code in trunk or branch-2 need not move out at all as 3.0
and 2.9 releases are still far out. In the current shape, the code works and
doesn't de-stabilize the branches and most of the work is complete. Therefore,
we don't need to hurry to move it out and add overhead of merging it back.
Instead, we would try to expedite the convergence on the API. Based on
discussion in HADOOP-12910, it does seem like there is a lot of demand for
Future with callback. We should plan to add that, ideally in a way that works
on both 3.x and 2.x. Reposting [~szetszwo]'s comment here:
bq. It seems that people really want Future with callback. I will think about
how to do it...
> [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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