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Incorrect values for memory usage being displayed #1346

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andrewmclagan opened this issue Oct 19, 2016 · 11 comments
Closed

Incorrect values for memory usage being displayed #1346

andrewmclagan opened this issue Oct 19, 2016 · 11 comments
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@bryk
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kind/bug Categorizes issue or PR as related to a bug.

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@andrewmclagan
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Issue details

Environment

Default GKE cluster installation.

Dashboard version: 0.1.4
Kubernetes version: 1.4.3 
Operating system: Default GKE cluster installation.
Node.js version: Default GKE cluster installation.
Go version: Default GKE cluster installation.
Steps to reproduce

View Workloads >> Pods then sum the total memory usage and compare that to the graphs. On our system there is a large disparity.

Expected result

Memory usage for pods should sum to the total in the graphs?

Comments

See attached screen grab
screen shot 2016-10-19 at 3 52 39 pm
@floreks floreks added kind/bug Categorizes issue or PR as related to a bug. priority/P0 and removed priority/P0 labels Oct 20, 2016
@bryk
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bryk commented Oct 21, 2016

Is this something that always happens always, or just sometimes?

Can you paste the output of http://<master-IP>/ui/api/v1/pod/default? (you can obfuscate everything that is not about metrics).

@andrewmclagan
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Not sure if im reading the endpoint correctly, although that redirects to:

/api/v1/proxy/namespaces/kube-system/services/kubernetes-dashboard/#/workload?namespace=default

Being the kubernetes bash not an API endpoint. Is that correct? If so i can dump that info

@bryk
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bryk commented Oct 24, 2016

The full endpoint is: /api/v1/proxy/namespaces/kube-system/services/kubernetes-dashboard/api/v1/pod/default. Use it for the dump.

@andrewmclagan
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{
  "listMeta": {
   "totalItems": 11
  },
  "pods": [
   {
    "objectMeta": {
     "name": "es-client-2600856264-0bubb",
     "namespace": "default",
     "labels": {
      "name": "elasticsearch",
      "pod-template-hash": "2600856264",
      "role": "client"
     },
     "annotations": {
      "kubernetes.io/created-by": "{\"kind\":\"SerializedReference\",\"apiVersion\":\"v1\",\"reference\":{\"kind\":\"ReplicaSet\",\"namespace\":\"default\",\"name\":\"es-client-2600856264\",\"uid\":\"27094f41-9a7b-11e6-8a15-42010af000c6\",\"apiVersion\":\"extensions\",\"resourceVersion\":\"633398\"}}\n",
      "kubernetes.io/limit-ranger": "LimitRanger plugin set: cpu request for container es-client"
     },
     "creationTimestamp": "2016-10-25T06:20:40Z"
    },
    "typeMeta": {
     "kind": "pod"
    },
    "podPhase": "Running",
    "podIP": "10.92.0.30",
    "restartCount": 0,
    "metrics": {
     "cpuUsage": 3,
     "memoryUsage": 1843240960,
     "cpuUsageHistory": [
      {
       "timestamp": "2016-10-25T06:54:00Z",
       "value": 3
      },
      {
       "timestamp": "2016-10-25T06:55:00Z",
       "value": 3
      },
      {
       "timestamp": "2016-10-25T06:56:00Z",
       "value": 3
      },
      {
       "timestamp": "2016-10-25T06:57:00Z",
       "value": 3
      },
      {
       "timestamp": "2016-10-25T06:58:00Z",
       "value": 3
      },
      {
       "timestamp": "2016-10-25T06:59:00Z",
       "value": 3
      },
      {
       "timestamp": "2016-10-25T07:00:00Z",
       "value": 3
      },
      {
       "timestamp": "2016-10-25T07:01:00Z",
       "value": 3
      },
      {
       "timestamp": "2016-10-25T07:02:00Z",
       "value": 3
      },
      {
       "timestamp": "2016-10-25T07:03:00Z",
       "value": 3
      },
      {
       "timestamp": "2016-10-25T07:04:00Z",
       "value": 5
      },
      {
       "timestamp": "2016-10-25T07:05:00Z",
       "value": 5
      },
      {
       "timestamp": "2016-10-25T07:06:00Z",
       "value": 3
      },
      {
       "timestamp": "2016-10-25T07:07:00Z",
       "value": 5
      },
      {
       "timestamp": "2016-10-25T07:08:00Z",
       "value": 13
      }
     ],
     "memoryUsageHistory": [
      {
       "timestamp": "2016-10-25T06:54:00Z",
       "value": 1843240960
      },
      {
       "timestamp": "2016-10-25T06:55:00Z",
       "value": 1843240960
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       "value": 1843077120
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       "value": 1842909184
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       "value": 1842909184
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       "value": 1844269056
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       "value": 1844187136
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       "value": 1844187136
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       "timestamp": "2016-10-25T07:07:00Z",
       "value": 1844244480
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      {
       "timestamp": "2016-10-25T07:08:00Z",
       "value": 1847726080
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     ]
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   },
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      "kubernetes.io/limit-ranger": "LimitRanger plugin set: cpu request for container es-client"
     },
     "creationTimestamp": "2016-10-25T06:23:14Z"
    },
    "typeMeta": {
     "kind": "pod"
    },
    "podPhase": "Running",
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    "restartCount": 0,
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     "cpuUsageHistory": [
      {
       "timestamp": "2016-10-25T06:54:00Z",
       "value": 53
      },
      {
       "timestamp": "2016-10-25T06:55:00Z",
       "value": 16
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      {
       "timestamp": "2016-10-25T06:56:00Z",
       "value": 7
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      {
       "timestamp": "2016-10-25T06:57:00Z",
       "value": 6
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      {
       "timestamp": "2016-10-25T06:58:00Z",
       "value": 6
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      {
       "timestamp": "2016-10-25T06:59:00Z",
       "value": 7
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       "timestamp": "2016-10-25T07:00:00Z",
       "value": 4
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       "timestamp": "2016-10-25T07:02:00Z",
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       "timestamp": "2016-10-25T07:03:00Z",
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      {
       "timestamp": "2016-10-25T07:04:00Z",
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       "value": 5
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      {
       "timestamp": "2016-10-25T07:07:00Z",
       "value": 9
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      {
       "timestamp": "2016-10-25T07:08:00Z",
       "value": 6
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     ],
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       "timestamp": "2016-10-25T06:54:00Z",
       "value": 1851748352
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      {
       "timestamp": "2016-10-25T06:55:00Z",
       "value": 1855627264
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       "timestamp": "2016-10-25T06:56:00Z",
       "value": 1855655936
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      {
       "timestamp": "2016-10-25T07:00:00Z",
       "value": 1856000000
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      {
       "timestamp": "2016-10-25T07:01:00Z",
       "value": 1856000000
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      {
       "timestamp": "2016-10-25T07:02:00Z",
       "value": 1856094208
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      {
       "timestamp": "2016-10-25T07:03:00Z",
       "value": 1856094208
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       "value": 1856266240
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       "timestamp": "2016-10-25T07:06:00Z",
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       "value": 1852932096
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     },
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      "kubernetes.io/limit-ranger": "LimitRanger plugin set: cpu request for container es-data"
     },
     "creationTimestamp": "2016-10-25T06:23:19Z"
    },
    "typeMeta": {
     "kind": "pod"
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      "kubernetes.io/limit-ranger": "LimitRanger plugin set: cpu request for container es-data"
     },
     "creationTimestamp": "2016-10-25T06:21:13Z"
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      "kubernetes.io/limit-ranger": "LimitRanger plugin set: cpu request for container es-master"
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     "creationTimestamp": "2016-10-25T06:15:31Z"
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       "value": 1
      }
     ],
     "memoryUsageHistory": [
      {
       "timestamp": "2016-10-25T06:54:00Z",
       "value": 2826240
      },
      {
       "timestamp": "2016-10-25T06:55:00Z",
       "value": 2826240
      },
      {
       "timestamp": "2016-10-25T06:56:00Z",
       "value": 2826240
      },
      {
       "timestamp": "2016-10-25T06:57:00Z",
       "value": 2826240
      },
      {
       "timestamp": "2016-10-25T06:58:00Z",
       "value": 2826240
      },
      {
       "timestamp": "2016-10-25T06:59:00Z",
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      },
      {
       "timestamp": "2016-10-25T07:00:00Z",
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      },
      {
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      {
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      {
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      {
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      },
      {
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      }
     ]
    }
   }
  ],
  "cumulativeMetrics": [
   {
    "dataPoints": [
     {
      "x": 1477378440,
      "y": 200
     },
     {
      "x": 1477378500,
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     },
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     }
    ],
    "metricName": "cpu/usage_rate",
    "aggregation": "sum"
   },
   {
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     {
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     }
    ],
    "metricName": "memory/usage",
    "aggregation": "sum"
   }
  ]
 }

@andrewmclagan
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@bryk For some more information, running kubectl top node returns:

NAME                                                  CPU(cores)   CPU%      MEMORY(bytes)   MEMORY%
gke-ethical-jobs-cluster-default-pool-04458a56-kphb   81m          4%        1760Mi          23%
gke-ethical-jobs-cluster-default-pool-04458a56-t5cy   90m          4%        1248Mi          16%

whilst the dash report 4.81Gb usage.

@bryk
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bryk commented Oct 28, 2016

Dashboard UI includes cached MEM in the nodes view, that may be the cause.

@bryk bryk self-assigned this Oct 28, 2016
@bryk
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bryk commented Oct 28, 2016

Investigating this....

@bryk
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bryk commented Oct 28, 2016

I think I've found the issue. We've been using slightly different metrics for the sparklines and large graphs.

Can I build a test image and pass you for verification that the fix actually works?

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bryk commented Oct 28, 2016

I pushed an image for you to verify. Take a look at: bryk/kubernetes-dashboard-amd64:canary

bryk added a commit to bryk/dashboard that referenced this issue Oct 28, 2016
@bryk
Make pod metrics sum to aggregate resouce usage graphs
a6f0acc 
The issue was with different metrics downloaded in the list and in the graphs. The other problem was that "current usage" was off by 15 mins.

Re kubernetes#1346
@bryk bryk mentioned this issue Oct 28, 2016
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@andrewmclagan
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Shall take a look at this, and report back. Thanks!

rf232 pushed a commit that referenced this issue Oct 31, 2016
@bryk @rf232
Make pod metrics sum to aggregate resouce usage graphs (#1381)
dd3ef7d 
The issue was with different metrics downloaded in the list and in the graphs. The other problem was that "current usage" was off by 15 mins.

Re #1346
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bryk commented Nov 3, 2016

I think this should be fine now. Please reopen if the problem still persists.

@bryk bryk closed this as completed Nov 3, 2016
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