Junping Du created YARN-2227:
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Summary: 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: Improvement
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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