[YARN-6257] CapacityScheduler REST API produces incorrect JSON - JSON object operationsInfo contains duplicate keys

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 2.8.1
• Fix Version/s: 3.2.0
• Component/s: capacityscheduler
• Target Version/s: 3.2.0
• Hadoop Flags: Incompatible change, Reviewed
• Release Note: The response format of resource manager's REST API endpoint "ws/v1/cluster/scheduler" is optimized, where the "operationInfos" field is converted from a map to list. This change makes the content to be more JSON parser friendly.
• Assignee: Tao Yang
• Reporter: Tao Yang
• Created: 01/Mar/17 07:00
• Updated: 05/Nov/18 11:02
• Resolved: 29/Mar/18 21:39

Description

In response string of CapacityScheduler REST API, scheduler/schedulerInfo/health/operationsInfo have duplicate key 'entry' as a JSON object :

"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"}}
}

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:

"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"}
]