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https://issues.apache.org/jira/browse/HADOOP-10300?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14372270#comment-14372270
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Hadoop QA commented on HADOOP-10300:
------------------------------------

{color:green}+1 overall{color}.  Here are the results of testing the latest 
attachment 
  http://issues.apache.org/jira/secure/attachment/12706046/HADOOP-10300.patch
  against trunk revision 586348e.

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

    {color:green}+1 tests included{color}.  The patch appears to include 1 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 
eclipse:eclipse.

    {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 
hadoop-common-project/hadoop-common.

Test results: 
https://builds.apache.org/job/PreCommit-HADOOP-Build/5976//testReport/
Console output: 
https://builds.apache.org/job/PreCommit-HADOOP-Build/5976//console

This message is automatically generated.

> Allowed deferred sending of call responses
> ------------------------------------------
>
>                 Key: HADOOP-10300
>                 URL: https://issues.apache.org/jira/browse/HADOOP-10300
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: ipc
>    Affects Versions: 2.0.0-alpha, 3.0.0
>            Reporter: Daryn Sharp
>            Assignee: Daryn Sharp
>         Attachments: HADOOP-10300.patch, HADOOP-10300.patch
>
>
> RPC handlers currently do not return until the RPC call completes and 
> response is sent, or a partially sent response has been queued for the 
> responder.  It would be useful for a proxy method to notify the handler to 
> not yet the send the call's response.
> An potential use case is a namespace handler in the NN might want to return 
> before the edit log is synced so it can service more requests and allow 
> increased batching of edits per sync.  Background syncing could later trigger 
> the sending of the call response to the client.



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