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From "Wangda Tan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-2800) Should print WARN log in both RM/RMAdminCLI side when MemoryRMNodeLabelsManager is enabled
Date Mon, 03 Nov 2014 18:13:34 GMT

    [ https://issues.apache.org/jira/browse/YARN-2800?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14194815#comment-14194815
] 

Wangda Tan commented on YARN-2800:
----------------------------------

[~ozawa],
Thanks for mention about YARN-1326, I think we should also add RMNodeLabelsManager being using
to the web UI.
But the case of mem-based node labels manager is a little different from mem-based RM state
store.
If user configured mem-based RM state store, apparently, after restart, all states will gone,
but the RM can still be able to launch and start serving. But if user configured mem-based
node labels manager, user may add labels to queue configurations, when RM will be failed to
launch (specifically, CS cannot initialize) if a queue use a label but not existed in node
labels manager -- That is more annoying than mem-based RM state store case. 

So I still prefer continuously printing WARN logs at every time user trying to do any modification
on node label manager to let admin know about that. Do you think does it make sense to you?
Please share your opinions.

Thanks,
Wangda

> Should print WARN log in both RM/RMAdminCLI side when MemoryRMNodeLabelsManager is enabled
> ------------------------------------------------------------------------------------------
>
>                 Key: YARN-2800
>                 URL: https://issues.apache.org/jira/browse/YARN-2800
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: client, resourcemanager
>            Reporter: Wangda Tan
>            Assignee: Wangda Tan
>         Attachments: YARN-2800-20141102-1.patch, YARN-2800-20141102-2.patch
>
>
> Even though we have documented this, but it will be better to explicitly print a message
in both RM/RMAdminCLI side to explicitly say that the node label being added will be lost
across RM restart.



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