Storm UI CPU/Memory metrics always return 0 (Storm 1.2.1)

[COSTE Thomas]

Hi all,

I am currently using the Storm UI metrics REST API to retrieve metrics from 
Storm, but it seems like the CPU and Memory metrics are always 0:

bash$ curl -X GET http://localhost:9080/api/v1/supervisor/summary | jq
{
  "supervisors": [
    {
      "totalMem": 3072,
      "slotsFree": 3,
      "host": "mx12405vm",
      "id": "6cb0b55a-ec38-47dd-afef-939ca64d8228",
      "uptime": "2h 4m 29s",
      "availMem": 3072,
      "totalCpu": 400,
      "usedCpu": 0,
      "logLink": "http://mx12405vm:8000/daemonlog?file=supervisor.log";,
      "usedMem": 0,
      "availCpu": 400,
      "slotsUsed": 1,
      "version": "1.2.1",
      "slotsTotal": 4,
      "uptimeSeconds": 7469
    }
  ],
  "schedulerDisplayResource": true,
  "logviewerPort": 8000
}


I am using a test topology (attached code) that artificially consumes cpu with 
a never-ending for loop:

public class DummyBolt extends BaseBasicBolt {
    public void execute(Tuple tuple, BasicOutputCollector basicOutputCollector) 
{
        System.out.println("Bolt is receiving id="+tuple.toString());
        for(;;){}
    }

    public void declareOutputFields(OutputFieldsDeclarer outputFieldsDeclarer) {

    }
}

Is there any setting that needs to be activated in order to publish these 
metrics ?
I tried switching schedulerDisplayResource to true but it did not change 
anything...

Thanks,
Thomas


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DummyBolt.java
Description: DummyBolt.java

DummySpout.java
Description: DummySpout.java

DummyTopology.java
Description: DummyTopology.java