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https://issues.apache.org/jira/browse/HDFS-9924?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15316696#comment-15316696
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Xiaobing Zhou commented on HDFS-9924:
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{quote}
It's a new feature with a significantly large API surface area. It should
absolutely require extra scrutiny before going in, new code or not.
{quote}
Allen Wittenauer, this is actually a switch-on/off feature. If you have a close
look at the design and implementation, async calls run async code path, leaving
code path of sync call as is to the maximum extent. This doesn't cause any
serious stability issue. In addition, user facing APIs are marked as @UnStable
to accommodate possible evolution. 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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