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From "Craig Welch (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-2495) Allow admin specify labels from each NM (Distributed configuration)
Date Mon, 16 Feb 2015 17:54:12 GMT

    [ https://issues.apache.org/jira/browse/YARN-2495?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14323076#comment-14323076
] 

Craig Welch commented on YARN-2495:
-----------------------------------

My point is that everything necessary to manage labels properly exists without DECENTRALIZED_CONFIGURATION_ENABLED,
it is a duplication of existing functionality.   The user controls this by:

1. choosing to specify or not specify a way of managing the nodes at the node manager
2. choosing to set or not set node labels and associations using the centralized apis

ergo, DECENTRALIZED_CONFIGURATION_ENABLED is completely redundant, it provides no capabilities
not already present.  Users will need to understand how the feature works to use it effectively
anyway, there is no value add by requiring that they repeat themselves (both by specifying
a way of determining node labels at the node manager level and by having to set this switch.).
 My prediction is that, if the switch is present, it's chief function will be to confuse and
annoy users when they setup a configuration for the node managers to generate node labels
and then the labels don't appear in the cluster as they expect them to.

> Allow admin specify labels from each NM (Distributed configuration)
> -------------------------------------------------------------------
>
>                 Key: YARN-2495
>                 URL: https://issues.apache.org/jira/browse/YARN-2495
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: resourcemanager
>            Reporter: Wangda Tan
>            Assignee: Naganarasimha G R
>         Attachments: YARN-2495.20141023-1.patch, YARN-2495.20141024-1.patch, YARN-2495.20141030-1.patch,
YARN-2495.20141031-1.patch, YARN-2495.20141119-1.patch, YARN-2495.20141126-1.patch, YARN-2495.20141204-1.patch,
YARN-2495.20141208-1.patch, YARN-2495_20141022.1.patch
>
>
> Target of this JIRA is to allow admin specify labels in each NM, this covers
> - User can set labels in each NM (by setting yarn-site.xml (YARN-2923) or using script
suggested by [~aw] (YARN-2729) )
> - NM will send labels to RM via ResourceTracker API
> - RM will set labels in NodeLabelManager when NM register/update labels



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