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https://issues.apache.org/jira/browse/YARN-6257?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16122755#comment-16122755
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Tao Yang commented on YARN-6257:
--------------------------------

This problem was imported by YARN-3293 (2.8.0+). The operationsInfo can't be 
correctly used before as it's not follow JSON format. [~vvasudev], Please help 
to review this issue.

> 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
>
>
> 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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