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From "Tsz Wo Nicholas Sze (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-9924) [umbrella] Asynchronous HDFS Access
Date Mon, 06 Jun 2016 12:11:21 GMT

    [ https://issues.apache.org/jira/browse/HDFS-9924?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15316405#comment-15316405
] 

Tsz Wo Nicholas Sze commented on HDFS-9924:
-------------------------------------------

> It's pretty obvious this should be going into a feature branch and requiring a branch-merge
vote. ...  I really wish the PMC was more actively watching what is actually going on in the
source tree because this type of behavior ultimately hurts stability.

We did not need a branch here since, as mentioned before, this change was adding mostly new
code but not changing existing code much.  Therefore, this feature won't hurt stability.

You might be upset by other features such as HDFS symlink.  I am sorry about that.  I believe
the PMC is already closely watching the commits.  In case you find any problems, please rise
your concern to the PMC.

> [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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