Grafana dashboard: Hadoop HDFS FSImage
Description: Used with Prometheus Hadoop HDFS FSImage Exporter in kubernetes

# About

Initial dashboard for hadoop in kubernetes (wait what?)

This is mainly a test of hdfs + nn + zk + jn in k8s:
- k8s 1.15.x
- prometheus v2.17.2 via prometheus-operator
- grafana v6.7.3 (a04ef6cefc) with prometheus as Data Source
- Hadoop 3.1.3 in HA setup ( zookeeper cluster + 3 journalnodes + 3 namenodes, which means 1 active nn and 2 standby)
- [marcelmay/hadoop-hdfs-fsimage-exporter](https://github.com/marcelmay/hadoop-hdfs-fsimage-exporter) v1.3 as sidecar in namenode pods, version 1.3 required for hadoop 3.x
- ServiceMonitor to scrape metrics - you must add ti on your own.

# Known limitations

- You need to create service monitor on your own.
- You may need to adjust dashboard to match your prometheus labels
- Vast majority of metrics is not yet exposed on the graphs, but you can add them on your own

# Changelog

2. 
- added variable for DS_PROMETHEUS so that json file can be directly added to grafana data directory and solves errors such as `Templating init failed Datasource named ${DS_PROMETHEUS} was not found`
`
1.
- initial release

# Contact

- [contact author](https://github.com/nvtkaszpir) if you have any suggestions etc


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        "refresh": 2,
        "regex": "",
        "skipUrlSync": false,
        "sort": 1,
        "tagValuesQuery": "",
        "tags": [],
        "tagsQuery": "",
        "type": "query",
        "useTags": false
      }
    ]
  },
  "time": {
    "from": "now-12h",
    "to": "now"
  },
  "timepicker": {
    "refresh_intervals": [
      "5s",
      "10s",
      "30s",
      "1m",
      "5m",
      "15m",
      "30m",
      "1h",
      "2h",
      "1d"
    ]
  },
  "timezone": "utc",
  "title": "Hadoop HDFS FSImage",
  "uid": "-rYZiMeWk",
  "variables": {
    "list": []
  },
  "version": 4
}