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https://issues.apache.org/jira/browse/HADOOP-12909?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15194570#comment-15194570
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Hadoop QA commented on HADOOP-12909:
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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | {color:blue} reexec {color} | {color:blue} 0m 0s 
{color} | {color:blue} Docker mode activated. {color} |
| {color:red}-1{color} | {color:red} patch {color} | {color:red} 0m 9s {color} 
| {color:red} HADOOP-12909 does not apply to trunk. Rebase required? Wrong 
Branch? See https://wiki.apache.org/hadoop/HowToContribute for help. {color} |
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|| Subsystem || Report/Notes ||
| JIRA Patch URL | 
https://issues.apache.org/jira/secure/attachment/12793432/HADOOP-12909-HDFS-9924.000.patch
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| JIRA Issue | HADOOP-12909 |
| Console output | 
https://builds.apache.org/job/PreCommit-HADOOP-Build/8848/console |
| Powered by | Apache Yetus 0.2.0   http://yetus.apache.org |


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> Change ipc.Client to support asynchronous calls
> -----------------------------------------------
>
>                 Key: HADOOP-12909
>                 URL: https://issues.apache.org/jira/browse/HADOOP-12909
>             Project: Hadoop Common
>          Issue Type: New Feature
>          Components: ipc
>            Reporter: Tsz Wo Nicholas Sze
>            Assignee: Xiaobing Zhou
>         Attachments: HADOOP-12909-HDFS-9924.000.patch
>
>
> In ipc.Client, the underlying mechanism is already supporting asynchronous 
> calls -- the calls shares a connection, the call requests are sent using a 
> thread pool and the responses can be out of order.  Indeed, synchronous call 
> is implemented by invoking wait() in the caller thread in order to wait for 
> the server response.
> In this JIRA, we change ipc.Client to support asynchronous mode.  In 
> asynchronous mode, it return once the request has been sent out but not wait 
> for the response from the server.



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