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From "Wangda Tan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-796) Allow for (admin) labels on nodes and resource-requests
Date Mon, 21 Jul 2014 02:16:39 GMT

    [ https://issues.apache.org/jira/browse/YARN-796?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14068116#comment-14068116
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Wangda Tan commented on YARN-796:
---------------------------------

Really thanks all your comments above,

As Sandy, Alejandro and Allen mentioned, concerns of centralized configuration. My thinking
is, node label is more dynamic comparing to any other existing options of NM.
An important use case we can see is, some customers want to mark label on each node indicate
which department/team the node belongs to, when a new team comes in and new machines added,
labels may need to be changed. And also, it is possible that the whole cluster is booked to
run some huge batch job at 12am-2am for example. So such labels will be changed frequently.
If we only have distributed configuration on each node, it is a nightmare for admins to re-configure.
I think we should have a same internal interface for destributed/centralized configuration.
Like what we've done for RMStateStore.

And as Jian Fang mentioned,
bq. doubt about the assumption for admin to configure labels for a cluster.
I think using script to mark labels is a great way to saving configuration works. But lots
of other use cases need human intervention as well. Good examples like from Allen and me.

Thanks,
Wangda

> Allow for (admin) labels on nodes and resource-requests
> -------------------------------------------------------
>
>                 Key: YARN-796
>                 URL: https://issues.apache.org/jira/browse/YARN-796
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>            Reporter: Arun C Murthy
>            Assignee: Wangda Tan
>         Attachments: LabelBasedScheduling.pdf, Node-labels-Requirements-Design-doc-V1.pdf,
YARN-796.patch
>
>
> It will be useful for admins to specify labels for nodes. Examples of labels are OS,
processor architecture etc.
> We should expose these labels and allow applications to specify labels on resource-requests.
> Obviously we need to support admin operations on adding/removing node labels.



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