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+# Scheduling Framework
+
+The fleet scheduling framework closely aligns with the native [Kubernetes scheduling framework](https://kubernetes.io/docs/concepts/scheduling-eviction/scheduling-framework/),
+incorporating several modifications and tailored functionalities.
+
+![](scheduling-framework.jpg)
+
+The primary advantage of this framework lies in its capability to compile plugins directly into the scheduler. Its API 
+facilitates the implementation of diverse scheduling features as plugins, thereby ensuring a lightweight and maintainable
+core. 
+
+The fleet scheduler integrates three fundamental built-in plugin types:
+* **Topology Spread Plugin**: Supports the TopologySpreadConstraints stipulated in the placement policy.
+* **Cluster Affinity Plugin**: Facilitates the Affinity clause of the placement policy.
+* **Same Placement Affinity Plugin**: Uniquely designed for the fleet, preventing multiple replicas (selected resources) from 
+being placed within the same cluster. This distinguishes it from Kubernetes, which allows multiple pods on a node.
+* **Cluster Eligibility Plugin**: Enables cluster selection based on specific status criteria.
+
+
+Compared to the Kubernetes scheduling framework, the fleet framework introduces additional stages for the pickN placement type:
+
+* **Batch & PostBatch**:
+  * Batch: Defines the batch size based on the desired and current `ClusterResourceBinding`.
+  * PostBatch: Adjusts the batch size as necessary. Unlike the Kubernetes scheduler, which schedules pods individually (batch size = 1).
+* **Sort**:
+  * Fleet's sorting mechanism selects a number of clusters, whereas Kubernetes' scheduler prioritizes nodes with the highest scores.
+
+To streamline the scheduling framework, certain stages, such as `permit` and `reserve`, have been omitted due to the absence
+of corresponding plugins or APIs enabling customers to reserve or permit clusters for specific placements. However, the
+framework remains designed for easy extension in the future to accommodate these functionalities.
+
+## In-tree plugins
+
+The scheduler includes default plugins, each associated with distinct extension points:
+
+| Plugin                       | PostBatch | Filter | Score |
+|------------------------------|-----------|--------|-------|
+| Cluster Affinity             | ❌         | ✅      | ✅     |
+| Same Placement Anti-affinity | ❌         | ✅      | ❌     |
+| Topology Spread Constraints  | ✅         | ✅      | ✅     |
+| Cluster Eligibility          | ❌         | ✅      | ❌     |
+
+
+The Cluster Affinity Plugin serves as an illustrative example and operates within the following extension points:
+1. **PreFilter**:
+Verifies whether the policy contains any required cluster affinity terms. If absent, the plugin bypasses the subsequent
+Filter stage.
+2. **Filter**:
+Filters out clusters that fail to meet the specified required cluster affinity terms outlined in the policy.
+3. **PreScore**:
+Determines if the policy includes any preferred cluster affinity terms. If none are found, this plugin will be skipped
+during the Score stage.
+4. **Score**:
+Assigns affinity scores to clusters based on compliance with the preferred cluster affinity terms stipulated in the policy.
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