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From "Allen Wittenauer (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-2495) Allow admin specify labels in each NM (Distributed configuration)
Date Tue, 21 Oct 2014 18:08:35 GMT

    [ https://issues.apache.org/jira/browse/YARN-2495?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14178762#comment-14178762
] 

Allen Wittenauer commented on YARN-2495:
----------------------------------------

bq. while modifying the script he will be able to configure the valid labels too.

The script can be updated *independently* of changing the running configuration files.  Changing
the xml comfigs will also require a *coordinated* reconfigure of the RM.  That isn't realistic,
especially for things such as rolling upgrades. HARM, of course, makes the situation even
worse. Additionally, I'm sure the label validation code will spam the RM logs every time it
gets an invalid label, which is pretty much a "please fill the log directory" action.

The *only* scenario I can think of where label validation has a practical use is if AMs and/or
containers are allowed to inject labels.  But that should be a different control structure
altogether and have zero impact on administrator controlled labels.

bq. Seems like maintenance wise it might become difficult for example,

Label validation actually makes your example worse because now the labels disappear completely.
 Is it a problem with the script or is it a problem with the label definition?

bq.  i feel centralized Label validation can be made configurable. Please provide opinion
on this.

Just disable it completely.  I'm still waiting to hear what practical application this bug
would have.

> Allow admin specify labels in 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
>
> 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 or using script suggested
by [~aw])
> - NM will send labels to RM via ResourceTracker API
> - RM will set labels in NodeLabelManager when NM register/update labels



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