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Table of Contents

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AssumptionNotes 
1

Issues and Decisions

#IssueNotesDecision
1How fast should CPS (and DB) be able to process max heart beat failures?is 60K really realistic if ENM goes down we should get a notification for each node do we ?!PoC has shown 60 seconds is reasonable
2Restart of NCMPShould/Can this be handled?As of now, there is no such case is being considered.
3Does DMI Plugin provide NCMP with a health check URL during registration? Either, just rely on the default one provided with Spring boot actuator?Document the contract. Its just the interface that matters and not the implementation.Spring boot actuator interface
4Error during cmHandle registration 

If an error occurs during registration what trustlevel should the cmHandle be set to? IN eth following scenarios

  1. When the user has provided an initial trustlevel of 'COMPLETE' (this information could be minuets old!) 
  2. When the user has provided an initial trustlevel of 'NONE'
  3. When the user has NOT provided a (valid) initial trustlevel



Agreed to Leave as is, if notification for a node already registered, we can process the other notification separately 


Team Notes: 

[Team]

When state was provided to 'COMPLETE' or 'NONE' and the registration fails , state if trust level is still set to the provided state regardless of the current state of the cm handle (deleted/deleting, advise, ready, locked)

5Module sync watchdog issues/error scenarios

If cmHandle is set to none/incomplete module sync will automatically retry (Is this acceptable?)

If the module sync fails we will still send a Complete message (Is this acceptable?)

Registering all cmHandles could take up to 20 mins, what should happen if the last sync fails as the notification would have been sent 20 mins ago?

When CMLevel is in:

DELETING/DELETED - No Truslevel notification update

ADVISE - No trustLevel notification update

READY - Truslevel notification update

LOCKED -Truslevel notification update


 


Team Notes: 

12/10/2023 [Team]

Notification SHALL only be sent when the Cm handle is set to Ready and locked regardless of the report from DMI 

Do we still update the cache? Yes.


6

When cm handle trustLevel state stays the same

Do we include that cm handle ID or not for notifications?

No you don't if no changes if it stays the the same


 


Team Notes:

12/10/2023 

Scenario: DMI plugin up/down

the previous state of the cm handle (trsutLevel) should be considered for notifications


Description

  1. Define scenarios which cause a CM Handle to go stale.
  2. Implement changes to support tracking of CM Handle Freshness/Staleness.

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Drawio
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diagramNameStaleness Freshness Overview
simpleViewerfalse
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diagramWidth939
revision710

InterfaceNameTriggerDescriptionTypeEndpoint or TopicSchema
1HealthCheck30 second interval (configurable)NCMP is to perform a health check against each of the DMI PluginsREST

http://<dmiPluginServiceName>/manage/health

This endpoint will be the standard heath check endpoint provided by spring boot actuator. We don't store it anywhere. We just document it for now.


2CMHandle trust level changeA CMHandle managed by DMI Plugin's trust level has changed

data contains {trustLevel: ENUM} 

event id is cmhandle id in kafka header

Kafka

kafka topic:

dmi-device-heartbeat

<cloudEvents-header>

  id : <cmhandleId>

  type : org.onap.cm.events.trustlevel-notification

data : {
      trustlevel : "COMPLETE/NONE"
}

3CMHandle Query API with trustLevel Query ConditionClient Request

CmHandle is to be returned based on the values in above CMHandle Trust Map

REST
  1. http://<host>:<port>/ncmp/v1/ch/id-searches
  2. http://<host>:<port>/v1/ch/searches 

{
  "cmHandleQueryParameters": [
    {
        "conditionName": "cmHandleWithTrustLevel",
        "conditionParameters": [ {"trustLevel": "COMPLETE"} ]
    }
  ]
}

4Notification on Trust Level ChangeNCMP

NCMP sends notification upon trust level changes

Kafka

kafka-topic:

cm-events

<cloudEvents-headers>

"data": {
   "attributeValueChange": [  # Mandatory
        { 
         "attributeName"     : "trustLevel",
         "oldAttributeValue" : "NONE",
         "newAttributeValue" : "COMPLETE"
        }
    ]
}

Managing TrustLevel

DMI Plugins

  1. NCMP is checking every DMI Plugin for health at interface 1 every 30 seconds using the Trust Level DMI Trust Map
  2. IF a DMI Plugin goes down, that DMI Plugin's trust level health status is updated to NONE in the Trust Level DMI Trust Map
    1. The CM handles corresponding to DMI should be set to NONE.
  3. IF a DMI Plugin comes back up, Trust level Heath status is set back to COMPLETE for that DMI plugin only.

    More details of health check URL can be accessed via:
    CPS-1857 Document watchdog job impl. with health check URL

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  1. It is the responsibility of the DMI Plugins to update NCMP about the heartbeat of CMHandle.
  2. Through interface 2, DMI Plugins will provide a Kafka event on the changing of trustworthiness state of a CMHandle.
    1. NCMP receives this event and updates the CM Handle Trust Map accordingly
  3. Needs to be able to handle a throughput of 60,000 State changes per minute for 2 instances

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Query CM Handle with Trust Level

  1. Body of request will be in the format as below:

    Code Block
    languagetext
    titleSearch Trust Level Request Body
    {
  "cmHandleQueryParameters": [
    {
        "conditionName": "cmHandleWithTrustLevel",
        "conditionParameters": [ {"trustLevel": "COMPLETE"} ]
    }
  ]
}


    There are two end points will be subject to query:
    http://<host>:<port>/ncmp/v1/ch/id-searches
    http://<host>:<port>/v1/ch/searches 

  2. Interface 3
  3. NCMP will first check trust level query parameters to determine which trust level (NONE, COMPLETE) is being searched.
    1. if Then, the target trust level is NONE
      1. The cm handles stored in CM Handle Trust Map having NONE will be returned.
      if for both DMI and CM Handle should be compared, and minimum of two (effective trust level)
      must be selected.
    2. If the target trust level is COMPLETEThe cm handles stored in CM Handle Trust Map having COMPLETE will be returned(comes from the request) is equal to effective trust level (obtained in step a.),
      then cm handle should be included in the response.

Notifications on Trust Level Changes

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