Elasticsearch Engineer Lab 7.3: Index lifecycle management query

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1

Course: Elasticsearch Engineer Lab 7.3: Index lifecycle management
Version: 8.1
Question: Query regarding rollover duration

Below is the lab question:

  • the index is in the hot phase for 2 minutes
  • when the index rolls over, it immediately moves to the warm phase, and the number of replicas is set to 1
  • after 2 minutes in the warm phase, the index moves to the cold phase and the number of replicas is set to 0
  • 5 minutes after rolling over, the index is deleted

Solution provided:

PUT _ilm/policy/my-metrics-policy
{
  "policy": {
    "phases": {
      "hot": {
        "actions": {
          "rollover": {
            "max_age": "2m"
          },
          "set_priority": {
            "priority": 100
          }
        },
        "min_age": "0ms"
      },
      "warm": {
        "min_age": "0d",
        "actions": {
          "set_priority": {
            "priority": 50
          },
          "allocate": {
            "number_of_replicas": 1
          }
        }
      },
      "cold": {
        "min_age": "2m",
        "actions": {
          "set_priority": {
            "priority": 0
          },
          "allocate": {
            "number_of_replicas": 0
          }
        }
      },
      "delete": {
        "min_age": "5m",
        "actions": {
          "delete": {}
        }
      }
    }
  }
}

I assume the solution to work as below:

  • the index is in the hot phase for 2 minutes
  • when the index rolls over, it immediately moves to the warm phase, and the number of replicas is set to 1
  • after "0" minutes in the warm phase or 2 mins from rollover, the index moves to the cold phase and the number of replicas is set to 0
  • 5 minutes after rolling over, the index is deleted

For index to be in warm phase for 2 mins and then rollover, I assume min_age should be 4m in cold phase.

      "cold": {
        "min_age": "4m",
        "actions": {
          "set_priority": {
            "priority": 0
          }

Correct me if I am wrong. :slight_smile:

Thanks,
Bryce

2

Apologies, cleared the confusion between rollover time and moving to phase time.
Solution provided in the lab is correct.

Regards,
Bryce