[jira] [Commented] (SPARK-10997) Netty-based RPC env should support a "client-only" mode.

["Apache Spark (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-10997?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14968272#comment-14968272 ] 

Apache Spark commented on SPARK-10997:
--------------------------------------

User 'vanzin' has created a pull request for this issue:
https://github.com/apache/spark/pull/9210

> Netty-based RPC env should support a "client-only" mode.
> --------------------------------------------------------
>
>                 Key: SPARK-10997
>                 URL: https://issues.apache.org/jira/browse/SPARK-10997
>             Project: Spark
>          Issue Type: Improvement
>          Components: Spark Core
>    Affects Versions: 1.6.0
>            Reporter: Marcelo Vanzin
>
> The new netty RPC still behaves too much like akka; it requires both client (e.g. an executor) and server (e.g. the driver) to listen for incoming connections.
> That is not necessary, since sockets are full-duplex and RPCs should be able to flow either way on any connection. Also, because the semantics of the netty-based RPC don't exactly match akka, you get weird issues like SPARK-10987.
> Supporting a client-only mode also reduces the number of ports Spark apps need to use.



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