Hadoop QA commented on YARN-1954:

{color:green}+1 overall{color}.  Here are the results of testing the latest 
  against trunk revision .

    {color:green}+1 @author{color}.  The patch does not contain any @author 

    {color:green}+1 tests included{color}.  The patch appears to include 2 new 
or modified test files.

    {color:green}+1 javac{color}.  The applied patch does not increase the 
total number of javac compiler warnings.

    {color:green}+1 javadoc{color}.  There were no new javadoc warning messages.

    {color:green}+1 eclipse:eclipse{color}.  The patch built with 

    {color:green}+1 findbugs{color}.  The patch does not introduce any new 
Findbugs (version 2.0.3) warnings.

    {color:green}+1 release audit{color}.  The applied patch does not increase 
the total number of release audit warnings.

    {color:green}+1 core tests{color}.  The patch passed unit tests in 

    {color:green}+1 contrib tests{color}.  The patch passed contrib unit tests.

Test results: 
Console output: https://builds.apache.org/job/PreCommit-YARN-Build/4571//console

This message is automatically generated.

> Add waitFor to AMRMClient(Async)
> --------------------------------
>                 Key: YARN-1954
>                 URL: https://issues.apache.org/jira/browse/YARN-1954
>             Project: Hadoop YARN
>          Issue Type: New Feature
>          Components: client
>    Affects Versions: 3.0.0, 2.4.0
>            Reporter: Zhijie Shen
>            Assignee: Tsuyoshi OZAWA
>         Attachments: YARN-1954.1.patch, YARN-1954.2.patch, YARN-1954.3.patch, 
> YARN-1954.4.patch, YARN-1954.4.patch, YARN-1954.5.patch, YARN-1954.6.patch, 
> YARN-1954.7.patch, YARN-1954.8.patch
> Recently, I saw some use cases of AMRMClient(Async). The painful thing is 
> that the main non-daemon thread has to sit in a dummy loop to prevent AM 
> process exiting before all the tasks are done, while unregistration is 
> triggered on a separate another daemon thread by callback methods (in 
> particular when using AMRMClientAsync). IMHO, it should be beneficial to add 
> a waitFor method to AMRMClient(Async) to block the AM until unregistration or 
> user supplied check point, such that users don't need to write the loop 
> themselves.

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