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Update Gossip entry in the book

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Sagar Dhawan 2019-02-21 13:04:51 -08:00 committed by Greg Fitzgerald
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book/src/gossip.md
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@ -93,19 +93,26 @@ that only adversarial nodes are selected for pull.
every push message. An eclipse attack on *push* would influence the active set
selection, or the random fanout selection.
### Time and Stake based weights
Weights are calculated based on `time since last picked` and the `natural log` of the `stake weight`.
Taking the `ln` of the stake weight allows giving all nodes a fairer chance of network
coverage in a reasonable amount of time. It helps normalize the large possible `stake weight` differences between nodes.
This way a node with low `stake weight`, compared to a node with large `stake weight` will only have to wait a
few multiples of ln(`stake`) seconds before it gets picked.
There is no way for an adversary to influence these parameters.
### Pull Message
A node is selected as a pull target based on local time since last selection and
the stake weight. There is no way for an adversary to influence those
parameters.
A node is selected as a pull target based on the weights described above.
### Push Message
A prune message can only remove an adversary from a potential connection.
Just like *pull message*, nodes are selected into the active set based on local
time since last selection and the stake weight. There is no way for an
adversary to influence those parameters.
Just like *pull message*, nodes are selected into the active set based on weights.
## Notable differences from PlumTree