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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 Fri, 10 Jul 2015 01:33:05 GMT

    [ https://issues.apache.org/jira/browse/YARN-3116?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14621573#comment-14621573
] 

Subru Krishnan commented on YARN-3116:
--------------------------------------

[~kkaranasos], thanks for taking at look at this JIRA. We felt _ContainerTokenIdentifier _
is a reasonably secure way to propagate the _containerType_  to NM from the RM.The _containerType_
is set in the _ContainerContext_ in the NM so that it is available for auxiliary services.
[~kishorch] is already integrating this with YARN-2884 so it should be aligned with what you
are trying to achieve in YARN-2877. Additionally based on [~xgong]'s feedback, we updated
_containerType_  to be an enum from the earlier boolean flag so should cover your future requirements
of adding additional container types.

> [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, YARN-3116.v2.patch, YARN-3116.v3.patch, YARN-3116.v4.patch,
YARN-3116.v5.patch, YARN-3116.v6.patch, YARN-3116.v7.patch, YARN-3116.v8.patch, YARN-3116.v9.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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