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Description of Use Case / Requirement:

DCAE Architecture includes currently DCAE Platform and DCAE Services component (collector/analytics etc). DCAE platform provides LCM (through Cloudify workflows) and several standardized functions for DCAE services such as 

• Configuration management and retrieval through CBS
• DMaap Topic provisioning
• Policy Interaction abstracted and managed by Policy Handler
• Postgres DB initialization

Goal of the transformation  is to offer these platform function as k8s based function (using k8s operator/sidecar/init-container etc) and enable onboarding and deployment of DCAE MS through helm directly, thereby simplifying the DCAE architecture and removing 3rd party component dependencies.

Primary Tranformation goals :

• Decentrailization of platform functions 
• Remove centralized configuration management (and enable application use K8S configmap)
• Facilitate flexible onboarding and deployment of DCAE services
• CI/CD based workflow automation
• Moving toward Cloud Native options for supporting current platform capabilities

**This will be multi-release effort and work per release will be scoped based on community support.

In Phase1 (Honolulu release) , certain DCAE service were migrated to Helm deployment (tracked under DCAEGEN-2488/REQ-479),  Cloudify was primary orchestration for dynamic deployments (MOD/CLAMP flows). 

Phase2 (Istanbul release) continued Helm transformation initaitives; delivered following features

• [DCAE] Migrated remaining DCAE services (13) into Helm deployment
• [DMAAP/OOM] Secure Topic/feedprovisioning under helm deployment
• [DCAE] Standardized App Configuration (including Policy, Dmaap etc.) management outside of Consul*
• [DCAE-MOD] MOD support for onboarding helm based services and integration with ONAP deployment*

            *  Partial delivery

Phase 3 (J release)  - Complete deferred/partial stories from Istanbul release (integrate MOD to support helm flows & migrating DCAE services to new SDK to remove consul dependency) + 

• [DCAE] Deprecate Cloudify components from ONAP deployments
• [INTEGRATION] Migrate all current Integration & gating test to leverage DCAE service component helm charts for functional/usecase validation
• [Policy] CLAMP/Control Loop design integration for Helm based deployment (TEST)*

Owners (one of these should be the Assignee - use @ notation):

vv770d, jackl

Link to HLD/LLD (if any):

https://wiki.onap.org/pages/viewpage.action?pageId=92997528

https://docs.onap.org/projects/onap-dcaegen2/en/latest/sections/installation_oom.html

https://docs.onap.org/projects/onap-dcaegen2/en/latest/sections/dcaeservice_helm_template.html

API Changes

Cloudify/handlers API's will be deprecated; this includes

• Dashboard
• InventoryAPI
• Deployment-Handler
• ServiceChange Handler
• ConfigBindingServices

Dependency Relationships with Other Projects:

DCAE IMPACT: C

• Impact Type: C
• Company Engagement:  AT&T, Nokia, Ericsson, Wipro, Independent 
• Resources:  X
• Support Status: S
• Non-Functional Requirement Support: TBD

HOLMES IMPACT: C

• Impact Type: C
• Company Engagement:  ZTE
• Resources:  X
• Support Status: S
• Non-Functional Requirement Support: TBD

OOM IMPACT: C

• Impact Type: C
• Company Engagement:  AT&T, Independent 
• Resources:  X
• Support Status: S
• Non-Functional Requirement Support: TBD

INTEGRATION IMPACT:C  

• Impact Type: C
• Company Engagement:  Nokia
• Resources:  X
• Support Status: S
• Non-Functional Requirement Support: TBD

 POLICY(CLAMP) IMPACT: TO 

•  Policy/CLAMP project work for DCAE integration covered under REQ-716 (CL Tosca)

Integration Leads (use @ notation): TBD