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https://issues.apache.org/jira/browse/HDFS-9924?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15316328#comment-15316328
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Tsz Wo Nicholas Sze commented on HDFS-9924:
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{quote}
I've gone ahead and moved the commits for AsyncFileSystem and TestAsyncDFS to a
new HDFS-9924 branch. I checked that this branch is identical to the previous
state of trunk before the reverts, and updated the fix versions of related
JIRAs. Compile tested all the branches.
{quote}
[~andrew.wang], we may not arbitrarily revert committed patches even if you
disagree the current approach. We are open for more discussion but I will
first revert the reverts you did. Please respect yourself as committer and
respect your commit privilege. Thanks.
> [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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