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explain why aggregate_and_proof for aggregate gossip in p2p faq

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Danny Ryan 2019-10-24 10:23:37 +09:00
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specs/networking/p2p-interface.md
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@ -11,7 +11,7 @@ It consists of four main sections:
## Table of contents
<!-- cmd: doctoc --maxlevel=2 p2p-interface.md -->
<!-- cmd: doctoc maxlevel=2 p2p-interface.md -->
<!-- START doctoc generated TOC please keep comment here to allow auto update -->
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@ -658,6 +658,10 @@ Attestations can only be included on chain within an epoch's worth of slots so t
In addition to this, relaying attestations requires validating the attestation in the context of the `state` during which it was created. Thus, validating arbitrarily old attestations would put additional requirements on which states need to be readily available to the node. This would result in a higher resource burden and could serve as a DoS vector.
### Why are aggregate attestations broadcast to the global topic as `AggregateAndProof`s rather than just as `Attestation`s?
The dominant strategy for an individual validator is to always broadcast an aggregate containing their own attestation to the global channel to ensure that proposers see their attestation for inclusion. Using a private selection criteria and providing this proof of selection alongside the gossiped aggregate ensures that this dominant strategy will not flood the global channel.
### Why are we sending entire objects in the pubsub and not just hashes?
Entire objects should be sent to get the greatest propagation speeds. If only hashes are sent, then block and attestation propagation is dependent on recursive requests from each peer. In a hash-only scenario, peers could receive hashes without knowing who to download the actual contents from. Sending entire objects ensures that they get propagated through the entire network.