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Table of Contents

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  1. NCMP REST Interface will follow/be inspired by RESTConf interface for easy acceptance of and transition to this interface
  2. Will follow ONAP's RESTful API Design Specification 
  3. The interface will include the concept of data-stores inspired by Network Management Datastore Architecture (NMDA) and as used in RESTConf
  4. The application should be able to easily switch between 'pass-through' and other datastores (also identical rest endpoint and responses)

References

Follow principles/patterns of RESTCONF RFC-8040 https://datatracker.ietf.org/doc/html/rfc8040
Follow principles/patterns of yang-patch RFC-8072 https://datatracker.ietf.org/doc/html/rfc8040
Follow principles/patterns of RESTCONF NMDA RFC-8527 https://datatracker.ietf.org/doc/html/rfc8527

Requirements

Note

Please note this section was added long after the implementation and focusses on characteristic only.

...

Issues & Decisions


IssuesNotesDecisions
1KPI for De-registration of 100 CM-handlesThis was mentioned. Was this ever agreed, is this a valid use case that needs to be covered together with the Registration ?

Not priority for now, but acceptable if we match the registration req.
#2 for de-reg  
kieran mccarthy Kolawole Adebisi-Adeolokun 

2DMI delayCould we get some feedback on DMI-delays for other use cases as not mentioned in FS document

Awaiting for ETH feedback AP On Kolawole Adebisi-Adeolokun and Csaba Kocsis


Provided

3

Number of instances


In some cases, ETH have used 2 instances, can we verify the number of instances for each use case.

Some of the req were defined per instance and resources used : Identify which of these ? 

Agreed to;

CPS use 1 instance currently, but should focus on aligning performance with 2 instances for all use case 

Kolawole Adebisi-Adeolokun Csaba Kocsis  

4Input Load Distribution the CM-handle search and ID search

Currently has 5 parallel request between them distributed at 2.5 each. This fractional distribution isn't feasible for parallel processing; the load should be allocated as whole numbers. Load needs to be distributed at. Would it be acceptable to adjust this distribution to either 2 or 3 parallel requests each (and vice versa ) without any negative repercussions?


Agreed to do 6 parallel request combined total and divide the load to 3 parallel request each

Kolawole Adebisi-Adeolokun Csaba Kocsis  

5Regarding CM-handle search and ID search

FS only identified Module performance, are there any testing done towards a combined search of properties and modules in a single query


Confirmed no other testing was previously done on this.....  

CPS have the capabilities to do mixed testing. ETH tbc on if they want to consider this ( Csaba Kocsis )


Requirements

Note

Please note this section was added long after the implementation and focuses on characteristic and enhancements after this study only.


Characteristics

It is proposed that reported characteristics will be used as a baseline for NCMP when agreed and sign-off.


OperationConcurrent requests/parallelDMI DelayResponse sizePerformance Requirement
(Blue Stone tablet KPI)		NotesSign-Off
1Registration of 20,000 CM-handles
(in batches of 100)		1 (requests are sequential)

100 ms to get module references
1,000 ms to get module resources

N/A

  • 11 CM-Handles/second as per Stone Tablet E2E Which include module conversion warm-up
  • NCMP Budget: 22 Cm Handles/second 
  1. Batch Size: 100 (per request)
    Not using Module Set Tags
  2. Time measured start of first rest-call until all cm handle states READY
  3. 1,000 unique module references.
  4. Five different types of Nodes. So 5 requests for Module Resources. Avg 200 modules each.
  5. The average size of yang resources in bytes 31.437 (32KiB)

Csaba Kocsis Toine Siebelink 

2De-registration of 100 CM-handles1 (requests are sequential)

No Module delays

N/A

  • 11 NEs/second
  • NCMP should target 22 NEs/Second 

De-registration is currently not mentioned in Stone Tablet KPI or FS, however we have agreed to match the performance of registration for now as de-reg is also not a priority at this point in time




 

Csaba Kocsis 

Toine Siebelink Kolawole Adebisi-Adeolokun 

3CM-handle ID search with Module filter

5 parallel request

N/A20,000 CM Handles i.e.
100*20.000 = 2MB

2 seconds/operation

FS stated 5 parallel request for each of ID search and search, meaning a combined total of 10 parallel search requests.

Kolawole Adebisi-Adeolokun Csaba Kocsis 

4CM-handle search with Module filter5 parallel requestN/A20,000 CM Handles i.e.
500*20.000 = 10MB

15 seconds/operation

FS stated 5 parallel request for each of ID search and search, meaning a combined total of 10 parallel search requests.

Kolawole Adebisi-Adeolokun Csaba Kocsis 

5Synchronous single CM-handle pass-through read

4 (Parallel operations)

300 ms

5 KB

10 request/second

Read are done in parallel with Write and searches.

Note CPS will test passthrough read using both cmHandleId and alternateId.

Kolawole Adebisi-Adeolokun Csaba Kocsis  

6Synchronous single CM-handle pass-through write (CUD)

4 (Parallel operations)

670 ms

5 KB

5 request/second

No response is expected

Kolawole Adebisi-Adeolokun Csaba Kocsis 

7Batch/Bulk Read

60 read request with 200 cmHandles each at 1 req/second.



150 cmhandles/second


  1. 60 request in 60 seconds overall budget for last response is 80seconds for 60 request to be processed
  2. The batch data operation is asynchronous.
  3. NCMP returns the response on the ncmp-async-m2m kafka topic.


Notes

  1. This is for mixed TCs
  2. Single KPIs will be monitored in NCMP owned pipeline with our performance every day(2 hrs interval) - Performance
  3. Test cases 3 through 7 are to run in parallel.

Synchronous single cm-handle pass-

...

through (read) requests

Parameter

Expectation

Notes

Sign-Off

Average Response Size
5KB
Shall not exceed 5KB

Kolawole Adebisi-Adeolokun 

Concurrent request12 clients requests toward 1 NCMP simultaneously
DMI also support 12 simultaneous requests

40ms of overhead on top of DMI latency for each requests, at most for NCMP request. This shall remain within 40ms for 12 parallel requests. 

Given the DMI delay below; this means up to 240 request per second

Kolawole Adebisi-Adeolokun  

DMI Delay10ms 

This is not in control of CPS. 
So for performance testing our stub should simulate a 10ms delay

Assume DMI is 1.25 seconds average DMI response time for high latency, low latency =10 ms, this should also work for DMI Plugin. I.e 40ms ontop of the DMI. 1.25seconds+40ms= 1.29seconds

Kolawole Adebisi-Adeolokun  

Test Environment


Expand
  1. CPS and NCMP

requests:
    cpu: 2000m
    memory: 2Gi
limits:
    memory: 3Gi
    cpu: 3000m

2. Postgres

requests:
    cpu: 4000m
    memory: 1Gi
 limits:
    memory: 3Gi
    cpu: 6000m



Kolawole Adebisi-Adeolokun 

Security

Disable Basic Authentication in Springboot

If configurable from application yaml, then it’s acceptable.

Kolawole Adebisi-Adeolokun 

...

Expand



Description

Notes

Decision

1Priority of async calls
In Istanbul, async calls are required only in pass-through cases. NCMP does not have to handle these requests 
2Will we use the data node wrapper on GET rest operations?

Currently, we wrap the response of GET operations using the data node wrapper.

we should mainly support yang-data/json

controlled by "accept-header"

3In the URI will we distinguish between data and operations (RFC calls) as part of the path?

e.g. http://localhost:8080/ncmp/v1/data

http://localhost:8080/ncmp/v1/operation

This only applies to pass-through

yes, we will distinguish between data and operation

4Which query parameters will NCMP support?

Parent data resource identifier can handle any path using the same query parameter 

  1. cpsPath
  2. RESTConf Path (pass-through)
  3. Proprietary Path (pass-through)
5

Yml should include return types and examples of the payload


Legacy and new API documentation needs to include output examples.

Task created, see 

Jira Legacy
serverSystem Jira
serverId4733707d-2057-3a0f-ae5e-4fd8aff50176
keyCPS-401

6camel case or dash in URI

We will use a dash for param names e.g. cmHandle (although it has since been agreed we use 'ch' in this particular case)

See no.3 https://restfulapi.net/resource-naming/

7Insert /resourcePath in front of the resource path to prevent ambiguous paths<OP>/ncmp/<v{vNumber}>/ch/<cmHandle>/<data|operations|{ncmp-operation}>/ds/{datastore}/[rp:]{resourcePath}?{query}Optionally insert the resource path ('rp:') if it clashes with the current
8Granularity of update scenarios (and priority)
  1. Add child and its descendants (supported in cps core)
  2. Add all list elements (supported in cps core)
  3. Replace child and its descendants (supported in cps core)
  4. Replace all list elements (pending in cps core)
  5. Update single leaf (new)
  6. Add list entry (new)

Priority is pass-through only so it depends on the RETSConf protocol that is supported.

In Jakarta or if required by other projects more fine-grained 'operation' datastore update options can be implemented

9Fallback option for datastore in release I
No, explicit datastore options will be used in Istanbul
10fields is a rest conf option, investigate is it fully supported by onap
Supported in pass-through for ONAP DMI plugin but depending on the support by the actual target. The intention is to increase support 'fields' in future requirements following RFC-8040 for operational datastore etc.
11Agree on URI syntax 

Proposed syntax by CPS team 

<OP>/ncmp/<v{vNumber}>/ch/<cmHandle>/<data|operations|{ncmp-operation}>/ds/{datastore}/[rp:]{resourcePath}?{query}

review completed and proposed URI agreed 
12Will we combine query capabilities with update capabilities?
We have decided not to combine query capabilities with update capabilities
13Description of header limitations

HTTP Header Limitations
Some servers put size limitations on HTTP headers, making them unsuitable for storing cmHandle information.

LIMITATION NOTE: server implementations put size limits on the headers meaning header contents should be designed carefully :
Apache - 8K
Nginx - 4K-8K
IIS - 8K-16K
Tomcat - 8K – 48K

14Will NCMP support paths for pass-through:running

The plugin will not do transformation or validation of paths in the case of pass-through:running

15Specification of path per cm handle
DMI Plugin can take cps paths or restconf paths and it needs to specify that per cm handle when cm handle is created
16What is the default path for NCMP
In NCMP default will always be cps path and depending on the adapter we can change it as needed per cm handle
17Fields parameter for ncmp/operational?
The fields parameter is ignored in ncmp/operational (in Istanbul release)
18Is specifying the datastore mandatory?
Datastore is mandatory in Istanbul release
19Register a DMI plugin with NCMP
DMI plugin is a part of cm handle registration. The rest endpoint on NCMP can be multiple calls
20Retrieve list of modules (names) for a cmHandle
Retrieve a list of module names for cm handle - this will be used by ncmp to get the models. - assuming ncmp model discovery is complete and it is stored in cps core, this will come from cached information
21Where will sync be implemented?
Implement sync in the dmi plugin and then have ncmp be able to pass on the request. This is not a bulk operation
22Config-true only support (filter out config-false data)
Use datastore 'running' to select this but filtering not supported in I for cached data
23Enable NCMP to convert cpsPath to mutliple options(RESTConf, netConf, leave as cpsPath)When other DMI-Plugins are realized they might need a different conversion then the default from cspPath to RESTConf. This could be configured by using a known property for each cmHandle Not required in Istanbul. But DB model can easily be updated to cater for this when needed
24Datastore conversion in NCMP or DMI-PluginDMI-Plugin will know best how to convert. This will also reduce future impacts on NCMP for new options.NCMP will do now conversion of datastore names
25What datastore/s (name/s) is/are supported by NCMP to referred to the cached data. 'Operational' or 'running''operational' would imply RO and config=false data is included. 'To also support 'running' using the same data a filter would have to be appliedsee supported datastore in I : Datastores16525680
26Consider fallback option when user specifies ncmp/operational but data is NOT synced
NCMP will forward requests for un-synced cmHandles to the DMI Plugin
(Including required transformation of resource path etc.)
27Support for &fields parameter when using cached data
  1. not supported (ignored, not rejects, nice for future compatibility)
  2. treat as 'no descendants'  (low cost)
  3. use to filter cached data

&Fields parameter will be ignored for 'cached' data in Istanbul timeframe 

long term expectation is to have support following RESTConf/ODL behavior as much as possible

28Support for &fields parameter when forwarding to plugin for non-synced cmHandles
  1. not supported (ignored, not rejects, nice for future compatibility)
  2. treat as 'no descendants'  (low cost)
  3. translate (insert module names) and forward

A spike 

Jira Legacy
serverSystem Jira
serverId4733707d-2057-3a0f-ae5e-4fd8aff50176
keyCPS-455
 will be executed to determine the feasibility of option 3 and decide if it can make Istanbul scope

29Response for Data Sync request (in Istanbul timeframe)The action is blocking synchronous through whole stack (in I) so response could include the data returned by the node. However this seem incorrect for an 'action' so maybe the response should just be just an acknowledgment it is 'done'No need to return data,  just HTTP Code 200 (OK) will suffice


...

Expand
#Req/usecase

REST

Method

 URI

Request/Response Example
1DMI notifies NCMP of new , deleted or changed cmhandles DMI Plugin NCMP. Including initial registrationPOST{ncmpRoot}/ncmp/v1/ch/
Scenario : DMI notifies NCMP of new cmhandles
Method : POST
URI : {ncmpRoot}/ncmp/v1/ch/
Header :
    Content-Type: application/json

Code Block
languagexml
titleRequest Body
Request Body : {
      "dmiPlugin" : "onap.dmi.plugin", 
      "createdCmHandles" : [ {   "cmHandle" : "rf4er5454",
                                 "cmHandleProperties" :
                                   { "subSystemId" : "system-001" }
                             }, {..} ],
      "updatedCmHandles" : [ .. ],
      "removedCmHandles" : [ "node-1", "node-2" , ... ]
  }


json attributes:

  • "dmiPlugin" resolvable servicename
  • "createdCmHandles" used for initial cm handle registrations or subsequent
    cmhandle creations
  • "updatedCmHandles"
    Used for updates to cmhandles. Same structure as for create handles
  • "removedCmHandles"  array of cmhandles that have been deleted
    from the network (no additional properties
2Get all cm handles that support  all modules in a given list of modulesPOST

{ncmpRoot}/ncmp/v1/ch/searches

URI :  {ncmpRoot}/ncmp/v1/ch/searches


The minimal requirement is if we provide the AND query impl then for OR query the client can send multiple requests


Request Body

Content: application/json

Note: revision should be optional 

{
  "modules": [
    {
      "moduleName": "", (Mandatory)
      "revision": "" (Optional)
    }
  ]
}


Header :
Accept: application/json
Response:

Should return an array of objects as we may add more data in the future 
{
  "cmHandles": [
    {
      "cmHandleId": "xxx"
    }
  ]
}

3Request (trigger) Data SyncPOST

{ncmpRoot}/ncmp/v1/ch/<cmHandle>/syncData

Scenario : Client requests to sync a node

URI : {ncmpRoot}/ncmp/v1/ch/node123/syncData

Response   : HTTP-Status code (only, no body)

4Get model info for CMHandleGET

{ncmpRoot}/ncmp/v1/ch/{cmHandle}/modules

Scenario : Get the model data for CMHandle

URI :{ncmpRoot}/ncmp/v1/ch/2334dedf/modules

Header :
      Accept: application/json

Response:

  [
        {
            "moduleName": "nc-notifications",
            "revision": "2008-07-14",
        },
        {
            "moduleName": "ietf-tls-server",
            "revision": "2016-11-02",
        },
        {
            "moduleName": "ietf-ssh-server",
            "revision": "2016-11-02",
        }
    ]
5Get all the registered cmhandles for a given pluginGET{ncmpRoot}/ncmp/v1/dmiPlugins/{pluginId}/ch

Scenario : Get all cmhandles from NCMP for a given dmiPlugin. May be used
for conciliation
Method : GET
URI : {ncmpRoot}/ncmp/v1/dmiPlugins/{dmiPlugin}/ch
Header :
Content-Type: application/json

Code Block
languagexml
titleResponse Body
Success Response :
    HTTP/1.1 200 Ok
Date: Thu, 26 Jan 2021 20:56:30 GMT
Server: example-server
  { "cmHandles" : [ {
          "cmHandle" : "node-1",
          "cmHandleProperties " : { "subSystem" : "system-001" }
       } ]
   }



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