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From "Subru Krishnan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-3116) [Collector wireup] We need an assured way to determine if a container is an AM container on NM
Date Mon, 29 Jun 2015 19:46:05 GMT

    [ https://issues.apache.org/jira/browse/YARN-3116?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14606252#comment-14606252
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Subru Krishnan commented on YARN-3116:
--------------------------------------

Thanks [~zjshen] for the offline discussion with [~giovanni.fumarola]. The conclusion was
that:
   * we will add a flag in _ContainerTokenIdentifier_ to indicate whether its an AM container
or not
   * we'll set the flag in _SchedulerApplicationAttempt::pullNewlyAllocatedContainersAndNMTokens_
where the _ContainerTokenIdentifier_ is created based on whether the current container has
a master container. The working knowledge is that *masterContainer* for AM is null as it itself
is the master container.

> [Collector wireup] 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: Giovanni Matteo Fumarola
>         Attachments: YARN-3116.patch
>
>
> 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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