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https://issues.apache.org/jira/browse/SPARK-11098?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14966657#comment-14966657
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Shixiong Zhu commented on SPARK-11098:
--------------------------------------

[~vanzin] Vanzin Sorry I didn't realize you were not working on this one...

I just sent a PR to fix the message ordering issue. I think we should guarantee 
that if using the same RpcEndpointRef to send multiple messages in the same 
thread, the receiver side should see these messages in the same order.

> RPC message ordering is not guaranteed
> --------------------------------------
>
>                 Key: SPARK-11098
>                 URL: https://issues.apache.org/jira/browse/SPARK-11098
>             Project: Spark
>          Issue Type: Sub-task
>          Components: Spark Core
>            Reporter: Reynold Xin
>
> NettyRpcEnv doesn't guarantee message delivery order since there are multiple 
> threads sending messages in clientConnectionExecutor thread pool. We should 
> fix that.



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