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# Replace nodes in subnet mpubz

Motivation: 
 - replacing degraded node cwb7w-kd3lm-4jzgx-mljqg-ptquz-665kh-w2svb-22eca-fab6l-jelhv-3ae
 - replacing node g4eis-jmdlu-iiivf-75n73-uto6l-miezg-kluob-ogj6z-2llqc-pomjl-jae to optimize network topology

Calculated impact on subnet decentralization if replacing:



Based on the calculated impact, replacing 1 additional nodes to improve optimization

Note: the heuristic for node replacement relies not only on the Nakamoto coefficient but also on other factors that iteratively optimize network topology.
Due to this, Nakamoto coefficients may not directly increase in every node replacement proposal.
Code for comparing decentralization of two candidate subnet topologies is at:
https://github.com/dfinity/dre/blob/79066127f58c852eaf4adda11610e815a426878c/rs/decentralization/src/nakamoto/mod.rs#L342

Note: the information below is provided for your convenience. Please independently verify the decentralization changes rather than relying solely on this summary.
Here is [an explaination of how decentralization is currently calculated](https://dfinity.github.io/dre/decentralization.html), 
and there are also [instructions for performing what-if analysis](https://dfinity.github.io/dre/subnet-decentralization-whatif.html) if you are wondering if another node would have improved decentralization more.



Decentralization Nakamoto coefficient changes for subnet `mpubz-g52jc-grhjo-5oze5-qcj74-sex34-omprz-ivnsm-qvvhr-rfzpv-vae`:
```
    node_provider: 5.00 -> 5.00    (+0%)
      data_center: 5.00 -> 5.00    (+0%)
data_center_owner: 5.00 -> 5.00    (+0%)
             city: 5.00 -> 5.00    (+0%)
          country: 2.00 -> 3.00   (+50%)
        continent: 1.00 -> 1.00    (+0%)
```

**Mean Nakamoto comparison:** 3.83 -> 4.00  (+4%)

Overall replacement impact: (gets better) the average log2 of Nakamoto Coefficients across all features increases from 1.7146 to 1.8121

# Details


Nodes removed:
- `cwb7w-kd3lm-4jzgx-mljqg-ptquz-665kh-w2svb-22eca-fab6l-jelhv-3ae` [health: degraded, impact on decentralization: (gets worse) the number of different NP actors decreases from 13 to 12]
- `g4eis-jmdlu-iiivf-75n73-uto6l-miezg-kluob-ogj6z-2llqc-pomjl-jae` [health: healthy, impact on decentralization: (gets worse) the average log2 of Nakamoto Coefficients across all features decreases from 1.7146 to 1.5000]

Nodes added:
- `4rpiz-7w7bf-smfm5-u7j3c-we6q7-qehxb-5lqnq-tjqsh-f7xu4-ihpao-zqe` [health: healthy, impact on decentralization: (gets better) the average log2 of Nakamoto Coefficients across all features increases from 1.5000 to 1.8121]
- `7r7kx-pfeyy-apl6r-7m3mi-nhuan-zy5rd-l4bxq-6x5ak-a4632-sqoof-qqe` [health: healthy, impact on decentralization: (gets better) the number of different NP actors increases from 12 to 13]


```
    node_provider                                                              data_center            data_center_owner            city                        country            continent            
    -------------                                                              -----------            -----------------            ----                        -------            ---------            
    4dibr-2alzr-h6kva-bvwn2-yqgsl-o577t-od46o-v275p-a2zov-tcw4f-eae       1    aw1          1 -> 0    AtlasEdge               1    Brussels Capital       1    AU            1    Asia           3 -> 2
    6nbcy-kprg6-ax3db-kh3cz-7jllk-oceyh-jznhs-riguq-fvk6z-6tsds-rqe       1    br2               1    CyrusOne                1    Bucuresti              1    BE            1    Europe         6 -> 7
    7a4u2-gevsy-5c5fs-hsgri-n2kdz-dxxwf-btcfp-jykro-l4y7c-7xky2-aqe  1 -> 0    bu1               1    Cyxtera            0 -> 1    Florida                1    CA       0 -> 1    North America       3
    7at4h-nhtvt-a4s55-jigss-wr2ha-ysxkn-e6w7x-7ggnm-qd3d5-ry66r-cae  0 -> 1    ch3               1    Digital Realty          1    Geneva                 1    CH            2    Oceania             1
    7ryes-jnj73-bsyu4-lo6h7-lbxk5-x4ien-lylws-5qwzl-hxd5f-xjh3w-mqe       1    fr2          0 -> 1    Equinix                 1    Hesse             0 -> 1    DE       0 -> 1                         
    bvcsg-3od6r-jnydw-eysln-aql7w-td5zn-ay5m6-sibd2-jzojt-anwag-mqe       1    ge1               1    Flexential              1    Illinois               1    JP       1 -> 0                         
    i3cfo-s2tgu-qe5ym-wk7e6-y7ura-pptgu-kevuf-2feh7-z4enq-5hz4s-mqe       1    mb1               1    HighDC                  1    Maribor                1    KR            1                         
    i7dto-bgkj2-xo5dx-cyrb7-zkk5y-q46eh-gz6iq-qkgyc-w4qte-scgtb-6ae       1    ns1               1    Latitude.sh             1    New South Wales        1    RO            1                         
    izmhk-lpjum-uo4oy-lviba-yctpc-arg4b-2ywim-vgoiu-gqaj2-gskmw-2qe       1    sg3               1    M247                    1    Ontario           0 -> 1    SE            1                         
    rbn2y-6vfsb-gv35j-4cyvy-pzbdu-e5aum-jzjg6-5b4n5-vuguf-ycubq-zae       1    sh1               1    Megazone Cloud          1    Pennsylvania      1 -> 0    SG            1                         
    sixix-2nyqd-t2k2v-vlsyz-dssko-ls4hl-hyij4-y7mdp-ja6cj-nsmpf-yae  1 -> 0    sl1               1    Nine.Ch                 1    Seoul                  1    SI            1                         
    ucjqj-jmbj3-rs4aq-ekzpw-ltjs3-zrcma-t6r3t-m5wxc-j5yrj-unwoj-mae       1    to2          0 -> 1    Posita.si               1    Singapore              1    US       3 -> 2                         
    wdjjk-blh44-lxm74-ojj43-rvgf4-j5rie-nm6xs-xvnuv-j3ptn-25t4v-6ae       1    tp1               1    Racks Central           1    Stockholm              1                                            
    wdnqm-clqti-im5yf-iapio-avjom-kyppl-xuiza-oaz6z-smmts-52wyg-5ae  0 -> 1    ty2          1 -> 0    Tierpoint          1 -> 0    Tokyo             1 -> 0                                            
    wwdbq-xuqhf-eydzu-oyl7p-ga565-zm7s7-yrive-ozgsy-zzgh3-qwb3j-cae       1    zh4               1                                 Zurich                 1                                            
```



Forum post link: https://forum.dfinity.org/t/subnet-management-mpubz-application/33756


Replace nodes in subnet mpubz