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From "Jitendra Nath Pandey (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-9924) [umbrella] Asynchronous HDFS Access
Date Thu, 09 Jun 2016 05:34:21 GMT

    [ https://issues.apache.org/jira/browse/HDFS-9924?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15321921#comment-15321921
] 

Jitendra Nath Pandey commented on HDFS-9924:
--------------------------------------------

   The current implementation is not that far from the options being discussed in HADOOP-12910.
The CompletableFuture and ListenableFuture both extend java Future therefore it is a compatible
API. The current AsyncGetFuture extends AbstractFuture which is a subclass of ListenableFuture.
Therefore, the current implementation may not be completely different from what we want in
trunk. 
   
  I think ListenableFuture is a good choice to have a consistent API in branch-2 and trunk,
and addresses the needs of most of the downstream users. Please weigh in your opinion on this.
  I would still recommend that for now, lets add ListenableFuture to AsyncDistributedFileSystem
only, and not to the user facing API.

> [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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