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    keyCPS-1616
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  • Impl. Proposal for Merging of Subscriptions CM Subscriptions : Creating/Merging( Positive Scenarios )

Issues & Decisions

...

New Subscription changes forecasted for 25Q2.
Deliver current event based subscription discuss with wider stakeholders on  

Create DME subscription interfaces as a new subscription epic -[CPS-2233] CM Subscription with DME interface - ONAP Jira

 

Kolawole Adebisi-Adeolokun  to create backlog Jira

Requirements

Functional


Interface

Requirement

Additional Information

Signoff
1CPS-E-08eNCMP will forward 'CM Notifications Subscription' LCM Create events to the appropriate DMI Plugins responsible for the CM Handles (ids) defined in the LCM Events. 
The message sent to DMI should include the private properties for each CM-Handle

 

2CPS-E-08e

Requirements

Functional

Create (ids) will forward 'CM Notifications Subscription' LCM Delete events to the appropriate DMI Plugins responsible for the CM Handles is defined in the LCM Events. 
The message sent to DMI should include the private properties for each CM-Handle.

A delete should only be forwarded if there is no other subscription for cmhandle datastore path.

Interface

Requirement

Additional Information

Signoff
1CPS-E-08e

NCMP will forward 'CM Notifications Subscription' LCM

Delete events to the appropriate DMI Plugins responsible for the CM Handles

is defined in the LCM Events. 
The message sent to DMI should include the private properties for each CM-Handle.

A delete should only be forwarded if there is no other subscription for cmhandle datastore path.


 

23CPS-E-08eNCMP responds using Kafka message(s) with the result of the LCM operation
These messages will use agreed status fields:
  • StatusCode  (to be included in documentation)
  • StatusMessage
  • resulterrorInfo  (NEW to be fleshed out)

 

3CPS-E-08eNCMP responds using Kafka message(s) with the result of the LCM operation
These messages will use agreed status fields:
  • StatusCode  (to be included in documentation)
  • StatusMessage
  • resulterrorInfo  (NEW to be fleshed out)

Action: Define error details later
Now in separate Epic, see 

Jira
serverONAP Jira
serverId425b2b0a-557c-3c0c-b515-579789cceedb
keyCPS-1865


4CPS-E-08eAll events should use Cloud Events formathttps://cloudevents.io/

5CPS-E-08eMessages should be processed in the order they are created (received)It will depend on DMIs responding within 30s.
Subscription-id should be used as Kafka 'key' to ensure this.

6CPS-E-08.eNCMP is to merge CM Notification Subscriptions create request and forward those to DMI plugin. (Interface to be added).
  • Prevent unnecessary subscription updates to nodes already involved in a subscription to the same path and datastore.
  • For possible combinations, see table below

7CPS-E-08.e

Last lights out: upon subscription Delete request only when there is no more subscription for a cm-handle & xpath & datastore combination a subscription-delete request will be sent to the relevant DMI(s).


8CPS-E-08.eA single client subscription request should result into a maximum of one request per DMI. Of course there can be several messages if more than 1 DMI is involved.

9CPS-E-08.eAmalgamate response should include rejected/accepted/pending DMI responses received within 30 seconds. A client shall be notified of available DMI subscription information after 30 seconds.  Subsequent DMI subscription updates shall be notified to clients as they become available.
  • Same schema for all notifications.
  • Subsequent notifications contains the state of all cmhandles involved in the subscription. 

10CPS-NCMP-I-01CM Handle deletion should NOT update subscription details. Do NOT delete dmi-subscription entry until owning subscription is deleted, see issue #4 below

11CPS-E-08.eBackward compatible with 'basic' created/delete operations.. 


...


Assumption

Notes

1Targets is a collection of xpathscan be implemented as a json array of strings
2for the DMI plugin cm-handle-id, datastore and xpath are the key to a unique subscriptionthe client-id and subscription name are not relevant for the DMI (should not be included in the request) as this would break the concept of merging!

Issues & Decisions


IssueNotes Decision
1Is it intended that CM Notification subscription request  cover (all) descendants of the given xpath too?!e.g.. if a child is removed and there is a subscription for the parent node, will a notification be send (grandchild, child leaf updates etc.) I hope NOT!
Consider:
  • Risk of client effectively subscribing to ALL data in a cm handle by specifying top level datanode(s)
  • Complexity (i.e. cost of) of merge operation. It might even required NCMP to check relevant dat model
  • Future use of wildcards, could be a viable alternative for including descendants


Descendent don't need to be taken into account

2Could xpath point to an element that does not exist (yet)if not how, how can I client be informed about a create event? 

xpath can point to an element that does not exist (yet)

CPS/NCMP Does not need to check Xpath

3Should NCMP support re-homing, moving of a CM Handle from one DMI to another?assume only trough delete & create 

only trough delete & create

4CM Handle Delete: Should DMI or Clients be sent a subscription update 

do NOT delete dmi-subscription entry until owning subscription is deleted
(just ignore upon future delete if cm handle is gone altogether)

Note. LCM is already broadcast (today) 


No, subscription update

  • Need to upgrade to CloudEevent format
  • Add subscription id (name+client id) to header (so client can filter)
5Validation of xpathoptions order of implement and also performance cost!
  1. none
  2. xpath-parser
  3. model check
  4. instance check

  1. None
6can DMI plugin 'reject' a subscription create (for a given cm-handle-xpath combination)As NCMP might not validate as per issue#5 the DMI=plugin or component further down might have to reject an invalid xpath...

Priyank Maheshwari 

yes currently DMI can use response to say which cm handles are not accepted i.e. rejected' (but not 'pending') 

7implementation question: should 'rejected' DMI-subscriptions be storednot needed as whole subscription should be rejected

not needed as whole subscription should be rejected

8Dimensioning of DB depends on #cm handles, #subscriptions and #xpaths per subscription, this could be too big for fast processing of updates! 

Need to agree maximum and possibly realistic average/total number of entries based on the characteristics  above
The team is blocked until this becomes clear as it will affect the way the data needs to be modelled exactly.



- kieran mccarthy- Dimensioning has been agreed.  See Characteristics

9Maximum (error) message sizetheoretically all cm handles and all xpaths combinations could be rejected or pending leading to a very large error message!

?? what was agreed ? Kolawole Adebisi-Adeolokun to update what was agree

10can each CM-Handle have different set of xpath(s) per subscriptionthe  current 'basic' solution only supports a common set of datastore/xpaths (filter)

Yes, schema modification allows this

11can the same cm handle/xpath have different subscriptions with different datastores, does that affect the cm data notifications send (which datastore applies)
  • can register on any (passthrough) datastore
    • running
    • operational

  • compulsory, validation needed
  • part of KEY (unique entry) so cmHandle+datastore+xpath is the key 


Although this wiki-page will not be updated where cmHandle+xpath is mentioned as  unique entry etc. this should now include a third field: datastore as well.

12Will migration from 'basic' be supportedPreferred to ask customers to create new subscriptions

No, basic sub. will not be delivered as a separate feature 

13list v list instances filtering

/p/c1
/p/c1[@key=23]
Are these different paths or not (from ncmp point of view)

List entries are unique.
*List instances might not always be supported, depending DMI Plugin impl.

14confirm subscription id (currently subscription name + client id)

previously was clientid and subcrioptionid and we were relying on concatenation of both to be unique

Now only the event would contain subcrioptionid 

15what subscription details should be send when there is a change (in the union)
  1. just delta
  2. just union
  3. union and delta (delta flagged) 

Just Delta

16one DMI rejects whole (see decision #6) subscription (affected cmhandles) but other DMI accepts the same subscription, is this possible how to handle

Yes, this has been analysed

17What all datastores are supported ?

ncmp-datastore:passthrough-running or ncmp-datastore:passthrough-operational ??

or both?

  - kieran mccarthy  Both will be supported

18When NCMP sends subscription request to DMI and then DMI responds back to NCMP , do we need to have a correlationId to track/map the request and response? 

Value: subscriptionID:DMIPluginName (Check if subscriptionId or DMIPlugin name doesn't contain a colon: ) - The seperator is to be chosen by the development team, will try with colon first. 

subscriptionId to be used.


19

Which status codes to be used when the DMI Plugins respond back to NCMP ? 

We already have codes defined in NCMP. Do we reuse the same status codes when DMI Plugin responds back to NCMP with the subscription status ?

Yes, reuse. 

kieran mccarthy - Reuse the same codes defined in NCMP.  

20

Impl. Proposal for Merging of Subscription


Schemas Agreed for the below events ( Source to Destination ) for the positive scenarios.

  1. DME to NCMP
  2. NCMP to DMI-Plugin
  3. DMI-Plugin to NCMP NCMP to DMEto NCMP 
  4. NCMP to DME
21Create DME subscription interfaces Schema ChangeSchema Change, Events driven change now HTTP Rest. Study status is at 2/3 of review. CPS need to study new changes to subscription once study is approved. 

New Subscription changes forecasted for 25Q2.
Deliver current event based subscription discuss with wider stakeholders on  

Create DME subscription interfaces as a new subscription epic -[CPS-2233] CM Subscription with DME interface - ONAP Jira

 

Kolawole Adebisi-Adeolokun  to create backlog Jira

Solution Proposal

State handling for initial (basic)subscription create/delete use cases (not using concept of 'merging')

...

#Topic NameEnvironment VariableSourceDestinationNotes
1
subscription
CM_SUBSCRIPTION_NCMP_CMIN_AVC_SUBSCRIPTIONTOPIC
DMEDME/Client-Apps
2
ncmp-dmi-cm-avc-subscription-<dmi-name>
NCMPCM_FORWARDSUBSCRIPTION_CMDMI_AVCIN_SUBSCRIPTIONTOPIC
NCMPDMI Plugin
3
dmi-ncmp-cm-avc-subscription
NCMPCM_RESPONSESUBSCRIPTION_CMDMI_AVCOUT_SUBSCRIPTIONTOPIC
DMI PluginNCMP
4
subscription-response
NCMPCM_OUTCOMESUBSCRIPTION_CMNCMP_AVCOUT_SUBSCRIPTIONTOPIC
NCMPDME/Client-Apps
5dmi-cm-events
DMI_CM_EVENTS_TOPIC
DMI PluginNCMPactual data notifications as per the subscriptions
6cm-events
NCMP_CM_EVENTS_TOPIC
NCMPDME/Client-AppsNCMP to forward the notifications to the client-apps.

Operation Specific Impl. Proposals

Create and Merge

Delete