GitHub user bjlovegithub opened a pull request:

    https://github.com/apache/flink/pull/2629

    [FLINK-4391] Provide support for asynchronous operations over streams

    PR for [FLIP 
12](https://cwiki.apache.org/confluence/pages/viewpage.action?pageId=65870673) 
- Implementation for Async I/O in FLINK.
    
    Basically, the newly added operator supports async operation while 
streaming. By implementing AsyncFunction, we can easily do i/o access, like 
fetching data from HBase, in async way.
    
    Please refer to AsyncIOExample.java about how to use it.
    


You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/bjlovegithub/flink master

Alternatively you can review and apply these changes as the patch at:

    https://github.com/apache/flink/pull/2629.patch

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #2629
    
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commit f352d0a8b879164baa8e4922f63ad8dde13c7c9b
Author: yushi.wxg <yushi....@taobao.com>
Date:   2016-10-12T06:31:43Z

    Add async wait operator

commit 139902396e1c30d88671ac67a54afea145ab7651
Author: yushi.wxg <yushi....@taobao.com>
Date:   2016-10-13T10:13:32Z

    1. add an example job 2. fix a bug in state serialization in async wait 
operator; 3. move broadcast barrier after snapshot operator states

commit fc41eedcd48d2dd7d940e744dec86a51b24e4ac5
Author: yushi.wxg <yushi....@taobao.com>
Date:   2016-10-13T10:25:36Z

    update IT case

commit 9855f071f04b6efcfc4e10a9f6ef1c38ae264637
Author: yushi.wxg <yushi....@taobao.com>
Date:   2016-10-13T10:28:39Z

    adjust the whitespace in IT

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