Zhijie Shen created YARN-3116:
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             Summary: We need an assured way to determine if a container is an 
AM container on NM
                 Key: YARN-3116
                 URL: https://issues.apache.org/jira/browse/YARN-3116
             Project: Hadoop YARN
          Issue Type: Sub-task
          Components: nodemanager, timelineserver
            Reporter: Zhijie Shen
            Assignee: Zhijie Shen


In YARN-3030, to start the per-app aggregator only for a started AM container,  
we need to determine if the container is an AM container or not from the 
context in NM (we can do it on RM). This information is missing, such that we 
worked around to considered the container with ID "xxxx_01" as the AM 
container. Unfortunately, this is neither necessary or sufficient condition. We 
need to have a way to determine if a container is an AM container on NM. We can 
add flag to the container object or create an API to do the judgement. Perhaps 
the distributed AM information may also be useful to YARN-2877.



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