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From "Tsz Wo Nicholas Sze (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-12909) Change ipc.Client to support asynchronous calls
Date Sun, 20 Mar 2016 01:24:33 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-12909?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15203039#comment-15203039
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Tsz Wo Nicholas Sze commented on HADOOP-12909:
----------------------------------------------

> ... Is there any cleaner way to do it?

The reason of being implemented using ThreadLocal is that there are no easy ways to get the
ipc.Client object from the caller, say DFSClient.  The ipc.Client object is hidden very deep
by Java [Proxy|http://docs.oracle.com/javase/7/docs/api/java/lang/reflect/Proxy.html] and
the RpcEngine layer.  If you could find some better ways to do it, please kindly let us know.

> 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, HADOOP-12909-HDFS-9924.001.patch,
HADOOP-12909-HDFS-9924.002.patch, HADOOP-12909-HDFS-9924.003.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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