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https://issues.apache.org/jira/browse/YARN-6257?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16416921#comment-16416921
 ] 

Sunil G commented on YARN-6257:
-------------------------------

Thanks [~Tao Yang]

{{the health metrics of capacity scheduler. This object existed but can't be 
actually used as the operationsInfo made illegal JSON data from 2.8.x to 3.1.x, 
and was corrected from 3.2.0}}

I think such an explanation seems better. I am trying to improve this message 
like below.

{{the health metrics of capacity scheduler. This information existed from 2.8.x 
to 3.1.x however this information is constructed with illegal JSON data format. 
Hence users can not make use of this field cleanly and is corrected from 3.2.0 
onwards.}}

 

> CapacityScheduler REST API produces incorrect JSON - JSON object 
> operationsInfo contains deplicate key
> ------------------------------------------------------------------------------------------------------
>
>                 Key: YARN-6257
>                 URL: https://issues.apache.org/jira/browse/YARN-6257
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: capacityscheduler
>    Affects Versions: 2.8.1
>            Reporter: Tao Yang
>            Assignee: Tao Yang
>            Priority: Minor
>         Attachments: YARN-6257.001.patch, YARN-6257.002.patch, 
> YARN-6257.003.patch
>
>
> In response string of CapacityScheduler REST API, 
> scheduler/schedulerInfo/health/operationsInfo have duplicate key 'entry' as a 
> JSON object :
> {code}
> "operationsInfo":{
>   
> "entry":{"key":"last-preemption","value":{"nodeId":"N/A","containerId":"N/A","queue":"N/A"}},
>   
> "entry":{"key":"last-reservation","value":{"nodeId":"N/A","containerId":"N/A","queue":"N/A"}},
>   
> "entry":{"key":"last-allocation","value":{"nodeId":"N/A","containerId":"N/A","queue":"N/A"}},
>   
> "entry":{"key":"last-release","value":{"nodeId":"N/A","containerId":"N/A","queue":"N/A"}}
> }
> {code}
> To solve this problem, I suppose the type of operationsInfo field in 
> CapacitySchedulerHealthInfo class should be converted from Map to List.
> After convert to List, The operationsInfo string will be:
> {code}
> "operationInfos":[
>   
> {"operation":"last-allocation","nodeId":"N/A","containerId":"N/A","queue":"N/A"},
>   
> {"operation":"last-release","nodeId":"N/A","containerId":"N/A","queue":"N/A"},
>   
> {"operation":"last-preemption","nodeId":"N/A","containerId":"N/A","queue":"N/A"},
>   
> {"operation":"last-reservation","nodeId":"N/A","containerId":"N/A","queue":"N/A"}
> ]
> {code}



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