Untitled

Detailed Solution Description:
Solution Overview:

The proposed solution aims to enhance the node isolation protocol by implementing a systematic algorithm that employs timestamps and CDS data. This algorithm ensures the safety of recycling nodes through a series of well-defined steps, including marking nodes for recycling, executing repair workflows to remove associated cells, and performing a robust safety check before allowing node recycling. The safety check involves cross-referencing timestamped information and CDS data to validate the absence of cells on the node and confirm that the last sweep occurred after the node was sealed.
Addressed Scenarios:
Scenario 1: Unreachable Cell

Problem:
A recycling node belongs to a cell, but the entire cell is currently unreachable, making it unsafe to isolate.

Solution:

    Mark Node for Recycling:
        The node is marked for recycling, and a timestamp is recorded.
    Repair Workflow:
        The repair workflow is triggered, removing all cells associated with the node.
    Isolation Safety Check:
        Utilizing timestamps and CDS data, the safety check ensures that the node is safe for isolation even if the entire cell is unreachable.
        The absence of cells on the node is confirmed, and the last sweep is validated to occur after the node was sealed.

Scenario 2: Unreachable Nodes in Subzone

Problem:
A group of nodes is unreachable in the subzone, but no cell exists where all nodes are unreachable. Each cell has been swept.

Solution:

    Mark Node for Recycling:
        Nodes are marked for recycling individually, each with its timestamp.
    Repair Workflow:
        Repair workflows are initiated for each node, removing associated cells.
    Isolation Safety Check:
        The safety check, incorporating timestamps and CDS data, validates the absence of cells on each node.
        Since every cell has been swept, CDS indicating no cells on a node ensures its safety for isolation.