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Align seen_ttl with attestation lifetime #3627

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Mar 29, 2024
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Align seen_ttl with attestation lifetime #3627

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2 changes: 1 addition & 1 deletion specs/phase0/p2p-interface.md
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Expand Up @@ -245,7 +245,7 @@ The following gossipsub [parameters](https://github.com/libp2p/specs/blob/master
- `fanout_ttl` (ttl for fanout maps for topics we are not subscribed to but have published to, seconds): 60
- `mcache_len` (number of windows to retain full messages in cache for `IWANT` responses): 6
- `mcache_gossip` (number of windows to gossip about): 3
- `seen_ttl` (number of heartbeat intervals to retain message IDs): 550
- `seen_ttl` (expiry time for cache of seen message ids, seconds): SECONDS_PER_SLOT * SLOTS_PER_EPOCH * 2
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Why not just set it at 1100 heartbeat intervals ? The previous value was estimated using the time for 1 epoch, so if we want to persist for 2 epochs, we can just double the current value.

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The gossipsub specification suggests this TTL should be expressed in time units, not heartbeats.

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@arnetheduck arnetheduck Mar 19, 2024 •
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it's a good question though - we could reconsider more parameters here to align them with slot length - ie for a network like gnosis (which afair has 6s slots), they don't necessarily make a lot of sense.

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Sounds good, would be fine at setting it in terms of consensus params in that case.

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To me seconds is more sensible to express this in anyway...


*Note*: Gossipsub v1.1 introduces a number of
[additional parameters](https://github.com/libp2p/specs/blob/master/pubsub/gossipsub/gossipsub-v1.1.md#overview-of-new-parameters)
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