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What-If Analysis of Subnet Decentralization

The WhatifDecentralization subcommand in the DRE tool allows users to perform "what-if" scenarios on the membership of a subnet and see the effect that the membership change would have on the subnet decentralization, without actually applying them, enabling better decision-making and risk assessment.

Command Structure

The whatif-decentralization command is a subcommand of the subnet command. The command accepts various parameters that specify the nodes to be added or removed, as well as specifying the subnet on which the analysis is performed.

Usage

subnet whatif-decentralization <SUBNET_ID> [--add-nodes <node-id...>] [--remove-nodes <node-id...>] [--subnet-nodes-initial <node-id...>]
Parameters:

  • <SUBNET_ID>: The ID of the subnet where the analysis is performed. This parameter is required.

    Example: tdb26-jop6k-aogll-7ltgs-eruif-6kk7m-qpktf-gdiqx-mxtrf-vb5e6-eqe

  • --add-nodes: A list of node IDs that you want to simulate adding to the subnet.

    Example:

    --add-nodes yahq2-6rnmm-n7ubm-q76zd-256dl-5f7k6-jxx5l-njyo2-hl7tk-sqcet-6ae tn2ne-tskw6-dfk3n-urdmd-krtq6-tcebq-dx2xr-kokq7-eood7-fadkg-5qe

    would show the impact on subnet decentralization if we add nodes yahq2 and tn2ne to the subnet.

  • --remove-nodes: A list of node IDs that you want to simulate removing from the subnet.

    --remove-nodes gvm7l-ds4n6-vkyjn-gwalp-3vdo6-qfmq7-pxhu4-zvqcu-ozvb7-qz3gr-vqe w2sev-mtuls-aa7m5-cdjgi-5vipg-2jn7i-4awvf-o6suu-73ebs-sw5db-kqe

    would show the impact on subnet decentralization if we remove nodes gvm7l and w2sev from the subnet.

  • --subnet-nodes-initial: A list of node IDs representing the initial state of the subnet. This can be used to override the current list of nodes in the subnet for the purpose of analysis.

    Example:

    --subnet-nodes-initial ncr4b-rasb7-tueb3-n4uos-5nxou-3wbxv-xmyt3-wfdsd-vu4b6-5x3cp-aqe ouffe-miylc-6zcwl-afv2d-lai62-qwzns-xtlji-p7pu2-qkx2e-x72y2-sqe tm3pc-2bjsx-hhv3v-fsrt7-wotdj-nbu3t-ewloq-uporp-tacou-lupdn-oae

    Note that it is necessary to provide the complete list of nodes in the subnet, so most likely you will need to provide 13 or more nodes in the list.

Please note that the number of nodes in the subnet should typically stay unchanged.

Example Usage

  1. Querying decentralization of an existing subnet:

    dre subnet whatif tdb26-jop6k-aogll-7ltgs-eruif-6kk7m-qpktf-gdiqx-mxtrf-vb5e6-eqe

  2. Adding and Removing Nodes from a Subnet: To simulate the effect of adding nodes node4 and node5 and removing nodes node6 and node7 from subnet subnet123, use the following command:

    subnet whatif-decentralization subnet123 --add-nodes node4 node5 --remove-nodes node6 node7

  3. Specifying Initial Nodes: If you want to override the current nodes in the subnet with a custom set for the analysis:

    subnet whatif-decentralization subnet123 --subnet-nodes-initial node1 node2 node3 node4 node5 --add-nodes node6 --remove-nodes node2

How It Works

  • The command creates a ChangeSubnetMembershipPayload that represents the proposed changes.
  • The specified SUBNET_ID is used as the target subnet for the analysis.
  • If the subnet-nodes-initial is specified, the analysis uses this custom list of nodes as the starting point; otherwise, it uses the current nodes in the subnet.
  • The decentralization_change function then performs the analysis based on the information from the NNS registry, simulating the removal and addition of nodes, and prints the results.