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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 Tue, 15 Mar 2016 03:02:33 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-12909?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15194662#comment-15194662
] 

Tsz Wo Nicholas Sze commented on HADOOP-12909:
----------------------------------------------

[~xiaobingo], thanks for posting a patch.  Some comments:
- We should not add the new conf fs.client.in.asynchronous.mode.  Let's simply add a setAsynchronous
somewhere.  It may be implemented by a ThreadLocal variable (similar to returnFuture).
- Let's rename isInAsynchronousMode to isAsynchronous and returnFuture to returnValue
- We don't need recvReponseExecutor for receiving responses.  We could implement a Future
subclass so that get() will invoke getRpcResponse(call, connection) and then return the return
value of the call.

> 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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