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The CPS project proposal covers multiple types of storage.

How will it integrate several DBMS technologies to support these different needs?

The access interface needs to suit the users of the data. It must also acknowledge the underlying data structure.

There are two main options: Providing behavior interfaces on a logical representation of the data; Providing behavior interfaces on the CPS and explicitly providing reference to the data

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There will be a single way to add a YANG model to CPS. This is done through the CPS model life-cycle management interface.

There are three ways in which the ONAP platform can add models. See details in Flow of models into the system

Is there an existing Yang Parser in ONAP an/or OpenDayLight that can be used for C&PS: yes; ODL's Yang Tools. This is already widely used in OMAP Java Projects (for more details follow link in prev. column)

PYang - a standard python tool for processing Yang model; benefit over ODL; conver to XML to perform own processing. Yang is a simple tree data structure. difficulty is extending/augmentation. PYang will come up with representation of data. Locked into Java vs a table. A Yang model can be served in V1/V2. Version management of Yang models. Augmentation to deal with modification of V1 of a model; upgrade from V1 > V2. maintaining schemas (Yang model) can ingest data in either V1 or V2 & serve it in V1/V2. 

We will start with Architectural Approach A in the PoC with the aim of fully supporting Architectural Approach C.

I.e. access to the data lake will be conditional on permission granted by the data owner. In the PoC we will not implement the permission granting mechanism

It needs to be clear to users the level of atomic operations supported by the CPS.

Transactions are performed sequentially and atomically (one at a time). As an external user you have a Java interface (with a dedicated mSvc) & REST interface. It is up to the user of C&PS to specify the order of changes in their input document.

The CPS will not use an external transaction manager. Where the underlying DBMS provides transactions, these will be exposed by the SPI and used by the CPS core library.

The CPS core library will expose a simple session concept to co-deployed modules. This will enable fine grained control of the order of changes. This will help ensure that complex validation (e.g. WHEN clause) succeeds.

For REST users, the session concept will not be exposed. Where documents representing several operations are input, the CPS will follow the order of the input document, and fail fast. Any failures will be abandoned (if the underlying DBMS supports transactions) and a failure response will be returned to the REST user.

(Rest of the Page is accepted)

Discuss Rest API 

Java API Wiki

SPI Wiki

For now there is no need to store full module identifier in the xpath field. The namespace, revision, parent module context will be taken into account using references through dedicated fields (module_id, parent_id).

Limitation determined: only keyed collections are supported.
No node identification by index is expected.

The attribute order for composite keys to be handled as dedicated task.
Both requested xpath and stored one expected to sort key attributes by attribute (leaf) name

Module-set is immutable collection of modules. None of modules can be added or removed independently, only as part of module-set insert or delete. Also module-set itself does not assume updates for now.

The module-set uniqueness within a dataspace to be identified by string identifier now, also by content later

The modules are stored as source definition, no processing on module entity persistence. On data validation it's expected the schema context (representing effective models) to be compiled with taking into account all the modules from the module-set.

The persistence of pre-compiled context (as module-set content) or caching it or other performance optimizations to be discussed later.

Module Set sources (yang files) to be stored on a unique content basis.
Uniqueness of a content to be identified using MD5 checksum.

To rename: 
Module Set → Schema Set
Yang File → Yang Resource

Discuss and clarify the expectations and implementation approach on subject.

Especially re. deployment options with SpringBoot application(s)