Zhijie Shen commented on YARN-2227:

Remove from 2.6.0, which has been released already.

> Move containerMgrProxy from RM's AMLaunch to get rid of issues that new 
> client talking with old server
> ------------------------------------------------------------------------------------------------------
>                 Key: YARN-2227
>                 URL: https://issues.apache.org/jira/browse/YARN-2227
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: resourcemanager
>            Reporter: Junping Du
>            Assignee: Junping Du
> In rolling upgrade semantics, we should handle cases that old client should 
> talk with new servers if only compatible changes happen in RPC protocol. In 
> this semantics, there is no guarantee that new client should able to talk 
> with old server which need us to pay specially attention on upgrading 
> sequence. Even this, we will find that it is still hard to deal with NM talk 
> with RM as there are both client and server at both side: in regular 
> heartbeat, NM is client and RM is server; when RM launch AM client, it go 
> through containerMgrProxy and RM is client while NM is server in this case. 
> We should get rid of this situation, i.e. by removing containerMgrProxy in RM 
> and use other way to launch container.

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