HadoopYarnClusterCheckerLib 49

fires an event if your hadoop-yarn cluster becomes empty

Sends event if the yarn-cluster is empty/free to trigger other stuff (e.g. send you an email or start another application)

The HadoopYarnClusterChecker-Class checks your cluster if there is any application run on it. In case your cluster is free it fires an event.

how it works:

• it's false positive: if there is any error like it can not connect to your yarn-rest-api it sends the event.
• algorithm:
  • receive data from: "/ws/v1/cluster/apps"-REST endpoint
  • are there applications with the state "running"?
    • Yes: Is this application excluded?
    • Yes: Are there more running applications?
      • No: send the event
      • Yes: sleep for the intervall & start with the first bulletin-point

Excludes

• has to be a String
• excludes for state-attribute are forbidden!
• don't forget to escape the "
• JSON-Notation:
  • Array
  • Key-Value-Object
  • Key: XML-Tag from the Yarn-Api
  • example:

  "[
  {\"name\":\"Zeppelin\"},
  {\"name\":\"Zeppelin1\"}
  ]"
  

  • meaning: all Applications with the Name "Zeppelin" and "Zeppelin1" will be excluded in case they're running
  • filtering:
    • for state-attribute is forbidden!
    • for multiple attributes like an AND should work:

      [
       {
        "name":"Zeppelin", 
        "priority":0
        }
      ]
      

How to use it:

import hadoop-yarn-cluster-checker-lib

checker = HadoopYarnClusterChecker(server=args.server, path=args.path, intervall=args.intervall, log=args.log,
                                                               excludes=args.excludes)
checker.on_empty_cluster += event_empty

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