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Objective

As of current implementation in cps core, after the update operation, entire configuration is sent as Kafka Notification. we are proposing to send only changed configuration as delta report in notification. It will help to understand what configuration exactly changed for the anchor. 

Issues & Decisions

#IssueNotesDecision
1Do we need to update existing update notification to send delta notification or delta notification along with existing notification. 





Event Schema

For delta notification we can use the existing cps data update event schema (cps-data-update-event-schema.json). 

#

1idUUID of the event
2source
urn:cps:org.onap.cps
3schema
urn:cps:org.onap.cps:data-updated-event-schema:v1
4type
org.onap.cps.data-updated-delta-event
5content
{
"operation": "UPDATE",
"anchorName": "Anchor1",
"dataspaceName": "dataspace1",
"schemaSetName": "schemaset1",
"observedTimestamp": timestamp,
"data":
data body 
[
  {
    "action": "ADD",
    "xpath": "/bookstore/categories/[@code=3]",
    "payload": {
      "code": 3,
      "name": "kidz"
    }
  },
  {
    "action": "DELETE",
    "xpath": "/bookstore/categories/[@code=1]",
    "payload": {
      "code": 1,
      "name": "Fiction"
    }
  },
  {
    "action": "UPDATE",
    "xpath": "/bookstore/categories/[@code=2]",
    "payload": {
      "name": "Comic"
    }
  }
]
}

Controlling Notification

 It is important to control the delta notification for better performance. we need to decide on below options to control delta notification.

OptionPros and Cons Decision
Send delta notification for the update operation when update request contains optional query parameter to receive notification. 

Pros:

  1. Dynamically control notification and per request level. 

Cons: 

  1. there could be issue with access control

Configure dataspace/anchor in yaml file to allow delta notification.

Pros:

  1. Only allowed dataspace/anchor's delta update will be sent in notification

Cons:

  1. Not practical because we can't control the notification dynamically.  

while creating dataspace/anchor, configure to send delta notification. 

Pros: 

  1. control the notification dynamically.

Cons:

  1. Need to persist notification information in DB. 


Implementation details

  1. For data nodes update operation, generate delta report by comparing previous and current configuration after successful update. 
  2.  Process data update delta event and send notification as described in event schema above. 
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