Arun Suresh created YARN-6979:

             Summary: Add flag to allow all container updates to be initiated 
via NodeHeartbeatResponse
                 Key: YARN-6979
             Project: Hadoop YARN
          Issue Type: Sub-task
            Reporter: Arun Suresh
            Assignee: kartheek muthyala

Currently, only the Container Resource increase command is sent to the NM via 
NodeHeartbeat response. This JIRA proposes to add a flag in the RM to allow ALL 
container updates (increase, decrease, promote and demote) to initiated via 
node HB.

The AM is still free to use the ContainerManagementPrototol's 
{{updateContainer}} API in cases where for instance, the Node HB is frequency 
is very low and the AM needs to update the container as soon as possible. In 
these situations, if the Node HB arrives before the updateContainer API call, 
the call would error out, due to a version mismatch and the AM is required to 
handle it.

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