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diff --git a/docs/sections/architecture.rst b/docs/sections/architecture.rst index 62b4e9b5..fc101159 100644 --- a/docs/sections/architecture.rst +++ b/docs/sections/architecture.rst @@ -5,29 +5,26 @@ Architecture ============ -Data Collection Analytics and Events (DCAE) is the data collection and analysis subsystem of ONAP. Its tasks include collecting measurement, fault, status, configuration, and other types of data from network entities and infrastructure that ONAP interacts with, applying analytics on collected data, and generating intelligence (i.e. events) for other ONAP components such as Policy, APPC, and SDNC to operate upon; hence completing the ONAP's close control loop for managing network services and applications. +Data Collection Analytics and Events (DCAE) is the primary data collection and analysis system of ONAP. DCAE architecture comprises of DCAE Platform and DCAE Service components so that the DCAE system is flexible, elastic, and expansive enough for supporting the potentially infinite number of ways of constructing intelligent and automated control loops on distributed and heterogeneous infrastructure. -The design of DCAE separates DCAE Services from DCAE Platform so that the DCAE system is flexible, elastic, and expansive enough for supporting the potentially infinite number of ways of constructing intelligent and automated control loops on distributed and heterogeneous infrastructure. +DCAE Service components are the functional entities that realize the collection and analytics needs of ONAP control loops. They include the collectors for various data collection needs, event processors for data standardization, analytics that assess collected data, and various auxiliary microservices that assist data collection and analytics, and support other ONAP functions. Service components and DMaaP buses form the "data plane" for DCAE, where DCAE collected data is transported among different DCAE service components. -DCAE Service components are the virtual functional entities that realize the collection and analysis needs of ONAP control loops. They include the collectors for various data collection needs, the analytics that assess collected data, and various auxiliary microservices that assist data collection and analytics, and support other ONAP functions. Service components and DMaaP buses form the "data plane" for DCAE, where DCAE collected data is transported among different DCAE service components. +DCAE Platform supports the functions to deploy, host and perform LCM applications of Service components. DCAE Platform components enable model driven deployment of service components and middleware infrastructures that service components depend upon, such as special storage and computation platforms. When triggered by an invocation call (such as CLAMP or via DCAE Dashboard), DCAE Platform follows the TOSCA model of the control loop that is specified by the triggering call, interacts with the underlying networking and computing infrastructure such as OpenSatck installations and Kubernetes clusters to deploy and configure the virtual apparatus (i.e. the collectors, the analytics, and auxiliary microservices) that are needed to form the control loop, at locations that requested. DCAE Platform also provisions DMaaP topics and manages the distribution scopes of the topics following the prescription of the control loop model by interacting with controlling function of DMaaP. -On the other hand DCAE Platform components enable model driven deployment of service components and middleware infrastructures that service components depend upon, such as special storage and computation platforms. That is, when triggered by an invocation call, DCAE Platform follows the TOSCA model of the control loop that is specified by the triggering call, interacts with the underlying networking and computing infrastructure such as OpenSatck installations and Kubernetes clusters to deploy and configure the virtual apparatus (i.e. the collectors, the analytics, and auxiliary microservices) that are needed to form the control loop, at locations that are requested by the requirements of the control loop model. DCAE Platform also provisions DMaaP topics and manages the distribution scopes of the topics following the prescription of the control loop model by interacting with controlling function of DMaaP. +DCAE service components configuration are stored under Key-Value store service, embodied by a Consul cluster. During deployment, DCAE platform (via Cloudify plugin) stores service component configuration under Consul for each deployment/instance (identified by ServiceComponentName). All DCAE components during startup will acess these configuration through ConfigBindingService api's to load deployment configuration and watch for any subsequent update. -DCAE service components operate following a service discovery model. A highly available and distributed service discovery and Key-Value store service, embodied by a Consul cluster, is the foundation for this approach. DCAE components register they identities and service endpoint access parameters with the Consul service so that DCAE components can locate the API endpoint of other DCAE components by querying Consul with the well know service identities of other components. +DCAE components use Consul's distributed K-V store service to distribute and manage component configurations where each key is based on the unique identity of a DCAE component, and the value is the configuration for the corresponding component. DCAE platform creates and updates the K-V pairs based on information provided as part of the control loop blueprint, or received from other ONAP components such as Policy Framework and CLAMP. Either through periodically polling or proactive pushing, the DCAE components get the configuration updates in realtime and apply the configuration updates. DCAE Platform also offers dynamic template resolution for configuration parameters that are dynamic and only known by the DCAE platform, such as dynamically provisioned DMaaP topics. This approach standardizes component deployment and configuration management for DCAE service components in multi-site deployment. -During the registration process, DCAE components also register a health-check API with the Consul so that the operational status of the components are verified. Consul's health check offers a separate path for DACE and ONAP to learn about module operation status that would still be applicable even when the underlying infrastructure does not provide native health-check methods. -More over, Consul's distributed K-V store service is the foundation for DCAE to distribute and manage component configurations where each key is based on the unique identity of a DACE component, and the value is the configuration for the corresponding component. DCAE platform creates and updates the K-V pairs based on information provided as part of the control loop blueprint, or received from other ONAP components such as Policy Framework and SDC. Either through periodically polling or proactive pushing, the DCAE components get the configuration updates in realtime and apply the configuration updates. DCAE Platform also offers dynamic template resolution for configuration parameters that are dynamic and only known by the DCAE platform, such as dynamically provisioned DMaaP topics. - - -DCAE R3 Components +DCAE R4 Components ------------------ -The following list displays the details of what are included in ONAP DCAE R3. All DCAE R3 components are offered as Docker containers. Following ONAP level deployment methods, these components can be deployed as Docker containers running on Docker host VM that is launched by OpenStack Heat Orchestration Template; or as Kubernetes Deployments and Services by Helm. +The following list displays the details of what are included in ONAP DCAE R4. All DCAE components are offered as Docker containers. Following ONAP level deployment methods, these components can be deployed as Kubernetes Deployments and Services. - DCAE Platform - Core Platform - Cloudify Manager: TOSCA model executor. Materializes TOSCA models of control loop, or Blueprints, into properly configured and managed virtual DCAE functional components. + - Plugins - Extended Platform - Configuration Binding Service: Agent for service component configuration fetching; providing configuration parameter resolution. - Deployment Handler: API for triggering control loop deployment based on control loop's TOSCA model. @@ -58,9 +55,8 @@ The following list displays the details of what are included in ONAP DCAE R3. A The figure below shows the DCAE R3 architecture and how the components work with each other. The components on the right constitute the Platform/controller components which are statically deployed. The components on the right represent the services which can be both deployed statically or dynamically (via CLAMP) -.. image:: images/R3_architecture_diagram.gif +.. image:: images/R4_architecture_diagram.png -Note: Missing Heartbeat, Universal Data-mapper, PM-Mapper descoped from R3 Deployment Scenarios -------------------- |