Assumptions

	Assumption	Notes
1	When a DMI restarts all cm-handles related to that DMI will consider to have trust-level COMPLETE	Temporary assumption until the 'Audit' function has been implemented

Issues and Decisions

how

#	Issue	Notes	Decision
1	How 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
2	Restart of NCMP	shouldShould/can Can this be handled?	As of now, there should no be re-registration flowis no such case is being considered.
3	Does DMI Plugin provide NCMP with a health check URL during registration? Or 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	4	Look for the dmi data service (dmiDataPlugin) for the healthcheck

Description

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

What might trigger a cmHandle to go to STALE?

dmi plugin identifies that the device is no longer contactable.
dmi plugin identifies that an underlying device manager managing the device (node) is out of sync with the device itself.

...

#	Interface	Requirement	Additional Information	Sign-off
1	CPS-NCMP-E-05	The 'trustlevel' is visible on all REST methods that currently include the 'cm handle state'	existing endpoints	26 Sep 2023
2	CPS-NCMP-E-05	CM Handles can be queried (filter condition) on 'trustlevel'	using a new 'trustLevel' condition (cannot use cpsPath condition)	26 Sep 2023
3	CPS-NCMP-I-01	During registration, DMI plugin can report initial trustlevel. If the state is not 'complete', it should be considered as 'Trustlevel change' (See req 5)	Initial trust level will be backward compatible if not set, we assume trustlevel is 'complete' For a new cm-handle where the trustlevel is 'complete' this is NOT considered a chance and no notifications should be sent	26 Sep 2023
4	CPS-NCMP-E-05	Once DMI (plugin) is detected to be down the trust-level for all affected CM Handles should be set to be 'NONE'. This wil also lead to many notifcations as per req. #5	this might lead to a high level (20K) of notifications (need to discuss capabilities)	26 Sep 2023
5	CPS-NCMP-E-05.e	NCMP notification shall be sent when the trustlevel changes	Notification be sent externally based on Kafka many small or bulk: Agreed Many notifications, one for each cm-handle	26 Sep 2023
6	CPS-NCMP-I-01.e	It shall be possible to report any trustlevel of one CM Handle DMI plugin can report the current trustLevel of a single cm handle id	i.e. the DMI can tell NCMP the trustLevel is 'NONE' when a node heartbeat failure is detected and 'COMPLETE' once it is restored. Again this should lead to notifications on the external interface as per req #5	26 Sep 2023

Error Handling

#

Error Scenario

Expected behavior

Sign-off

1

NCMP restart (all instances)

To be discussed, not sure if it can/should be handled

TrustLevels should be 'NONE' and need to be restored using an audit-request (not in scope)

Characteristics

#	Parameter	Expectation	Notes
1	dmi-down detection speed	30 seconds
2	device heartbeat frequency (message emitted by DMI plugin for each device)	60 seconds
3	maximum supported devices (by NCMP)	60,0000	Given #2 and #3 this means NCMP needs to process 60,000 message / minute!
4	maximum number of cm-handles down report by DMI in one request and/or per minute	30,000 / minute	a peak can be processed within 60 seconds
5	processing of all trustLevel time for DMI-Down and/or peak load by DMI	1 second
6	If we incorporate into searches endpoints the speed should not be impacted

...

This epic will only introduce trustLevels trustLevel NONE and COMPLETE. PARTIAL and POOR may be added later as below.
Re-registration i.e. resolving trutsLevel degradation is not in scope of this epicNCMP will not send notification on trustLevel changes for external consumers

High Level Interactions

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Interface

Name

Trigger

Description

Type

Endpoint or Topic

Schema

1

HealthCheck

30 second interval (configurable)

NCMP is to perform a health check against each of the DMI Plugins

REST

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.

2

CMHandle trust level change

A 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"
}

3

TrustLevel RequestCMHandle Query API with trustLevel Query Condition

Client Request

TrustLevel

CmHandle is to be returned based on the values in above

Maps

CMHandle Trust Map

REST

http://<host>:<port>/ncmp/v1/ch/id-searches
http://<host>:<port>/v1/ch/searches

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

Managing

...

TrustLevel

DMI Plugins

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

...

CMHandle Heartbeat

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

...

Body of request will be in the format as below:

Code Block

language	text
title	Search 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

Interface 3
NCMP will first check trust level query parameters to determine which trust level (NONE, COMPLETE) is being searched.
1. if the target trust level is NONE
  1. The cm handles stored in untrustworthyCmHandleSet CM Handle Trust Map having NONE will be returned.
2. if the target trust level is COMPLETE
  1. If that DMI which is managing the CMHandle is marked as untrustworthy then we return NONE
  2. If that DMI is trustworthy, the cm handles for that DMI The cm handles stored in CM Handle Trust Map having COMPLETE will be returned.

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Assumptions

Issues and Decisions

Error Handling

Characteristics

High Level Interactions

Managing

TrustLevel

DMI Plugins

CMHandle Heartbeat

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Versions Compared

Old Version 33

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Key

Assumptions

Issues and Decisions

Error Handling

Characteristics

High Level Interactions

Managing

TrustLevel

DMI Plugins

CMHandle Heartbeat