# Placement Specifications

Significant feature developments are tracked in documents called specifications. From the Train cycle onward, those documents are kept in this section. Prior to that, Placement specifications were a part of the Nova Specs.

The following specifications represent the stages of design and development of resource providers and the Placement service. Implementation details may have changed or be partially complete at this time.

- Generic Resource Pools

- Compute Node Inventory

- Resource Provider Allocations

- Resource Provider Base Models

- Nested Resource Providers

- Custom Resource Classes

- Scheduler Filters in DB

- Scheduler claiming resources to the Placement API

- The Traits API - Manage Traits with ResourceProvider

- Request Traits During Scheduling

- filter allocation candidates by aggregate membership

- perform granular allocation candidate requests

- inventory and allocation data migration (reshaping provider trees)

- handle allocation updates in a safe way

## Train

### Implemented

- Support filtering by forbidden aggregate membership
- Getting On The Nested Magic Train 1
- Provide resource provider - request group mapping in allocation candidates

### In Progress

- Support Consumer Types

## Xena

### Implemented

- Allow provider re-parenting in placement
- Support Consumer Types

### In Progress

## Yoga

### Implemented

- Support mixing required traits with any traits
- Support any traits in allocation_candidates query

### In Progress

## Zed

### Implemented

### In Progress

- Example Spec - The title

## 2023.1

### Implemented

### In Progress

- Policy Defaults Improvement

this page last updated: 2026-04-01 21:43:44

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