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7 months ago
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Solution Overview:

The proposed solution aims to enhance the node isolation protocol by introducing a systematic algorithm that leverages timestamps and CDS (Colony Data Service) data. The algorithm follows a multi-step process, including marking the node for recycling, initiating a repair workflow to remove all cells associated with the node, and confirming the absence of cells on the node before proceeding with recycling. The confirmation process involves cross-referencing CDS data, ensuring no cells are associated with the node, and validating that the last sweep occurred after the node was sealed. This approach provides a robust mechanism for determining the safety of recycling nodes, addressing issues related to the existing isolation protocol.
System Architecture:
Classes and Their Responsibilities:

        Responsible for processing node isolation safety checks.
        Utilizes timestamps and CDS data to determine if a node is safe for isolation.
        Coordinates with other classes to perform the necessary checks and updates.

        Records timestamps when a node is marked for recycling.
        Provides methods to retrieve timestamp information for nodes.

        Maintains context information related to the node scan.
        Stores data such as node information, cell information, and other relevant details.

        Manages the retrieval of cell states for the cells associated with a node.
        Ensures accurate information about cell states is available for the isolation check.

Workflow Steps:

    Mark Node for Recycling:
        Initiated by external triggers, such as the isolation workflow.
        Involves setting the node to the 'recycling' state and recording the timestamp.

    Repair Workflow:
        Removes all cells associated with the node.
        Coordinates with CellStateClient to ensure accurate cell state information.

    Isolation Safety Check:
        Performed by IsNodeIsolationSafeProcessor.
        Utilizes timestamps and CDS data to confirm the absence of cells on the node.
        Validates that the last sweep occurred after the node was sealed.


    Timestamp: Recorded when a node is marked for recycling, indicating the time of initiation.
    CDS Data: Information retrieved from the Colony Data Service, including details about node-cell associations and sweep times.
    Isolation Safety Check: The process of determining whether a node is safe for isolation based on timestamps and cross-referencing with CDS data.

Pros and Cons:

    Improved Adaptability: The solution addresses rigidity by considering various scenarios, including outpost and substrate situations.
    Comprehensive Safety Checks: The algorithm performs a thorough safety check by combining timestamps and CDS data, ensuring the absence of cells on the node.
    Clear Confirmation Process: The systematic confirmation process provides a clear and structured approach to validate node safety for recycling.


    Implementation Complexity: The proposed solution introduces additional steps and checks, potentially increasing the complexity of the isolation workflow.
    Data Staleness Concerns: There may be concerns about potential staleness in timestamps or CDS data, requiring careful handling to avoid false positives or negatives.
    Increased Development Time: Implementing the comprehensive safety checks and confirmation process may require additional development time and testing.
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