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From "Arun C Murthy (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-796) Allow for (admin) labels on nodes and resource-requests
Date Thu, 13 Jun 2013 22:35:21 GMT

    [ https://issues.apache.org/jira/browse/YARN-796?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13682847#comment-13682847

Arun C Murthy commented on YARN-796:

Labels are resources which max=1 and a total that is equal to the max number of containers
a node may have (driven by mem or cpu, whichever allows less containers). Then a node that
has a given label-resource always has capability for it if there is enough capability of memory
and/or CPU. Then, a DRF scheduler could use label-resources for 'fair' allocation decisions.

A node can have a large number of admin-specified labels (os, arch, dept etc. etc.).

Resources have to be well specified and tangible (cpu, memory, disk, network).

We don't want to be recompiling PB defs for adding in unknown number of labels.

Hence, we need to go a separate 'constraint' or 'label' route.
> 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: New Feature
>            Reporter: Arun C Murthy
>            Assignee: Arun C Murthy
> 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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