[AMBARI-19746] Ambari HDFS Metric alerts turns to UNKNOWN status with error "argument of type 'NoneType' is not iterable"

• Type: Bug
• Status: Resolved
• Priority: Blocker
• Resolution: Fixed
• Affects Version/s: 2.5.0
• Fix Version/s: 2.5.0
• Component/s: alerts
• Assignee: Dmytro Sen
• Reporter: Kishor Ramakrishnan
• Created: 27/Jan/17 14:20
• Updated: 20/Mar/17 21:43
• Resolved: 02/Feb/17 18:14

Description

Build used : ambari-2.5.0.0-724

Test is updating the alert definition minimumValue to "0.0".
Payload used to update the minimumValue

/{
	"AlertDefinition": {
		"cluster_name": "cl1",
		"id": 81,
		"name": "increase_nn_heap_usage_daily",
		"label": "NameNode Heap Usage (Daily)",
		"component_name": "NAMENODE",
		"description": "This service-level alert is triggered if the NameNode heap usage deviation has grown beyond the specified threshold within a day period.",
		"enabled": true,
		"ignore_host": false,
		"interval": 1,
		"scope": "ANY",
		"service_name": "HDFS",
		"source": {
			"parameters": [{
				"name": "mergeHaMetrics",
				"display_name": "Whether active and stanby NameNodes metrics should be merged",
				"value": "false",
				"description": "Whether active and stanby NameNodes metrics should be merged.",
				"type": "STRING",
				"visibility": "HIDDEN"
			}, {
				"name": "interval",
				"display_name": "Time interval in minutes",
				"value": "1440.0",
				"description": "Time interval in minutes.",
				"type": "NUMERIC",
				"visibility": "HIDDEN"
			}, {
				"name": "appId",
				"display_name": "AMS application id",
				"value": "NAMENODE",
				"description": "The application id used to retrieve the metric.",
				"type": "STRING",
				"visibility": "HIDDEN"
			}, {
				"name": "metricName",
				"display_name": "Metric Name",
				"value": "jvm.JvmMetrics.MemHeapUsedM",
				"description": "The metric to monitor.",
				"type": "STRING",
				"visibility": "HIDDEN"
			}, {
				"name": "metric.deviation.warning.threshold",
				"display_name": "Growth Rate",
				"value": "20.0",
				"description": "The percentage of NameNode heap usage growth.",
				"type": "PERCENT"
			}, {
				"name": "metric.deviation.critical.threshold",
				"display_name": "Growth Rate",
				"value": "50.0",
				"description": "The percentage of NameNode heap usage growth.",
				"type": "PERCENT"
			}, {
				"name": "metric.units",
				"display_name": "Metric Units",
				"value": "MB",
				"description": "The units that the metric data points are reported in.",
				"type": "STRING",
				"visibility": "HIDDEN"
			}, {
				"name": "minimumValue",
				"display_name": "Minimum Heap",
				"value": "0.0",
				"description": "The minimum heap increase in a day.",
				"type": "NUMERIC"
			}],
			"path": "HDFS/2.1.0.2.0/package/alerts/alert_metrics_deviation.py",
			"type": "SCRIPT"
		}
	}
}

Alert response :

03:14:20 AM 01-25-2017 AmbariItems FINE - API call response:{
  "href" : "http://172.27.9.139:8080/api/v1/clusters/cl1/alerts/119",
  "Alert" : {
    "cluster_name" : "cl1",
    "component_name" : "NAMENODE",
    "definition_id" : 81,
    "definition_name" : "increase_nn_heap_usage_daily",
    "firmness" : "HARD",
    "host_name" : "ctr-e126-1485243696039-2656-01-000006.hwx.site",
    "id" : 119,
    "instance" : null,
    "label" : "NameNode Heap Usage (Daily)",
    "latest_timestamp" : 1485314039820,
    "maintenance_state" : "OFF",
    "occurrences" : 13,
    "original_timestamp" : 1485313319818,
    "repeat_tolerance" : 1,
    "repeat_tolerance_remaining" : 0,
    "scope" : "ANY",
    "service_name" : "HDFS",
    "state" : "UNKNOWN",
    "text" : "argument of type 'NoneType' is not iterable"
  }
}

Note : Test used to pass consistently.

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