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https://issues.apache.org/jira/browse/HDFS-9924?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16900426#comment-16900426
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Jorge Machado commented on HDFS-9924:
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Any ideas how to improve the hdfs dfs put command with async io ? Or I'm I in
the wrong thread. From what I saw here
[https://github.com/apache/hadoop/blob/trunk/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/IOUtils.java#L129]
Copy Commands still uses blocking io right ?
> [umbrella] Nonblocking 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: Duo Zhang
> Priority: Major
> Attachments: Async-HDFS-Performance-Report.pdf,
> AsyncHdfs20160510.pdf, HDFS-9924-POC.patch
>
>
> This is an umbrella JIRA for supporting Nonblocking 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 nonblocking 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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