Alluxio monitor bug

[flyhighzy]

Alluxio Version: 2.8.1

Describe the bug As shown, "Bytes Read Cache" here is negative, which is obviously incorrect

To Reproduce After alluxio cluster is ready, at the beginning of job read data from alluxio, it always occurs.

Expected behavior show the right data

[HelloHorizon]

@beinan @dbw9580 can you take a look?

[singer-bin]

@flyhighzy Can you post your json template and see what indicator (bytes read cache) is?

[flyhighzy]

here is the panel json:

{
  "datasource": "$alluxio_datasource",
  "aliasColors": {},
  "bars": false,
  "dashLength": 10,
  "dashes": false,
  "fieldConfig": {
    "defaults": {
      "custom": {}
    },
    "overrides": []
  },
  "fill": 1,
  "fillGradient": 0,
  "gridPos": {
    "h": 8,
    "w": 6,
    "x": 12,
    "y": 10
  },
  "hiddenSeries": false,
  "id": 109,
  "legend": {
    "avg": false,
    "current": false,
    "hideEmpty": true,
    "max": false,
    "min": false,
    "show": true,
    "total": false,
    "values": false
  },
  "lines": true,
  "linewidth": 1,
  "nullPointMode": "null",
  "options": {
    "alertThreshold": true,
    "dataLinks": []
  },
  "percentage": false,
  "pluginVersion": "7.3.4",
  "pointradius": 2,
  "points": false,
  "renderer": "flot",
  "seriesOverrides": [],
  "spaceLength": 10,
  "stack": false,
  "steppedLine": false,
  "targets": [
    {
      "expr": "Cluster_BytesReadRemote{fluid_runtime=~\"$fluid_runtime\",namespace=~\"$namespace\"} - Cluster_BytesReadUfsAll{fluid_runtime=~\"$fluid_runtime\",namespace=~\"$namespace\"}",
      "interval": "",
      "legendFormat": "Bytes read cache",
      "refId": "A"
    }
  ],
  "thresholds": [],
  "timeFrom": null,
  "timeRegions": [],
  "timeShift": null,
  "title": "Bytes Read Cache",
  "tooltip": {
    "shared": true,
    "sort": 0,
    "value_type": "individual"
  },
  "type": "graph",
  "xaxis": {
    "buckets": null,
    "mode": "time",
    "name": null,
    "show": true,
    "values": []
  },
  "yaxes": [
    {
      "format": "bytes",
      "label": null,
      "logBase": 1,
      "max": null,
      "min": null,
      "show": true
    },
    {
      "format": "short",
      "label": null,
      "logBase": 1,
      "max": null,
      "min": null,
      "show": true
    }
  ],
  "yaxis": {
    "align": false,
    "alignLevel": null
  }
}

[singer-bin]

@flyhighzy Seems to be out of order. Cluster_BytesReadUfsAll - Cluster_BytesReadRemote

[flyhighzy]

But actually, as time goes on, "Bytes read cache" metric become positive and seems right

[singer-bin]

sorry i was wrong, it looks like a bug. @flyhighzy

[singer-bin]

@flyhighzy look it

[singer-bin]

[singer-bin]

[github-actions[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed in two weeks if no further activity occurs. Thank you for your contributions.