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From "Duo Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-9924) [umbrella] Nonblocking HDFS Access
Date Fri, 09 Jun 2017 08:10:19 GMT

     [ https://issues.apache.org/jira/browse/HDFS-9924?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Duo Zhang updated HDFS-9924:
----------------------------
    Attachment: HDFS-9924-POC.patch

A simple rpc client built on netty. Test mkdirs and getFileInfo in TestAsyncDFSClient. Used
to prove that option 3 can work.

https://github.com/Apache9/hadoop/commit/aa1623c426ee97398089ba15496651119a1672a9

> [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: Xiaobing Zhou
>         Attachments: AsyncHdfs20160510.pdf, Async-HDFS-Performance-Report.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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