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https://issues.apache.org/jira/browse/YARN-3963?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14643246#comment-14643246
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Naganarasimha G R commented on YARN-3963:
-----------------------------------------

Hi [~bibinchundatt], 
??throw new IOException("Label=" + label.getName() + "(" + 
rmNodeLabel.getIsExclusive() + ")" + " already added");??
message would be better as 
{{throw new IOException("Exclusivity cannot be modified for an existing label : 
" + label.getName() + "(" + rmNodeLabel.getIsExclusive() + ")" );}}

In test case ??Assert.fail("IOException not thrown should have on adding same 
labels");??
I think better message would be {{"IOException is expected when exlusivity is 
modified"}}

> AddNodeLabel on duplicate label addition shows success 
> -------------------------------------------------------
>
>                 Key: YARN-3963
>                 URL: https://issues.apache.org/jira/browse/YARN-3963
>             Project: Hadoop YARN
>          Issue Type: Bug
>            Reporter: Bibin A Chundatt
>            Assignee: Bibin A Chundatt
>            Priority: Minor
>         Attachments: 0001-YARN-3963.patch, 0002-YARN-3963.patch, 
> 0003-YARN-3963.patch
>
>
> Currently as per the code in 
> {{CommonNodeLabelManager#addToClusterNodeLabels}} when we add same nodelabel 
> again event will not be fired so no updation is done. 
>  
> {noformat}
> ./yarn rmadmin –addToClusterNodeLabels x
> ./yarn rmadmin –addToClusterNodeLabels “x(exclusive=true)”
> ./yarn rmadmin –addToClusterNodeLabels “x(exclusive=false)”
>  {noformat}
> All these commands will give success when applied again through CLI 
>  
> {code}
> 2015-07-22 21:16:57,779 INFO 
> org.apache.hadoop.yarn.nodelabels.CommonNodeLabelsManager: Add labels: 
> [<z:exclusivity=true>]
> 2015-07-22 21:16:57,779 INFO 
> org.apache.hadoop.yarn.server.resourcemanager.RMAuditLogger: USER=dsperf   
> IP=10.19.92.117 OPERATION=addToClusterNodeLabels        TARGET=AdminService   
>   RESULT=SUCCESS
> 2015-07-22 21:17:06,431 INFO 
> org.apache.hadoop.yarn.nodelabels.CommonNodeLabelsManager: Add labels: 
> [<z:exclusivity=false>]
> 2015-07-22 21:17:06,431 INFO 
> org.apache.hadoop.yarn.server.resourcemanager.RMAuditLogger: USER=dsperf   
> IP=<IP> OPERATION=addToClusterNodeLabels        TARGET=AdminService     
> RESULT=SUCCESS
>  {code}
> Also since exclusive=true to false is not supported success is misleading



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