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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 Thu, 31 Mar 2016 10:06:26 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-12909?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15219698#comment-15219698
] 

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

Some more comments for TestAsyncIPC:
- TestAsyncIPC seems not really testing asynchronous since it always immediately calls returnFuture.get()
to block the caller.  Could you add some new tests to test asynchronous?
- TestAsyncIPC should not extends TestIPC.  It makes the test complicated.  We may change
the code in TestIPC package private instead of protected (i.e. just remove "private" but not
adding "protected").  Then TestAsyncIPC can reuse the code in TestIPC.

> 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, HADOOP-12909-HDFS-9924.004.patch,
HADOOP-12909-HDFS-9924.005.patch, HADOOP-12909-HDFS-9924.006.patch, HADOOP-12909-HDFS-9924.007.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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