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De-duplicate attestations in the slasher (#2767)

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## Issue Addressed

Closes https://github.com/sigp/lighthouse/issues/2112
Closes https://github.com/sigp/lighthouse/issues/1861

## Proposed Changes

Collect attestations by validator index in the slasher, and use the magic of reference counting to automatically discard redundant attestations. This results in us storing only 1-2% of the attestations observed when subscribed to all subnets, which carries over to a 50-100x reduction in data stored 🎉 

## Additional Info

There's some nuance to the configuration of the `slot-offset`. It has a profound effect on the effictiveness of de-duplication, see the docs added to the book for an explanation: 5442e695e5/book/src/slasher.md (slot-offset)
This commit is contained in:
Michael Sproul
2021-11-08 00:01:09 +00:00
parent fadb8b2b2b
commit df02639b71
13 changed files with 252 additions and 93 deletions
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4
slasher/src/lib.rs
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@@ -15,8 +15,8 @@ pub mod test_utils;
mod utils;
pub use crate::slasher::Slasher;
pub use attestation_queue::{AttestationBatch, AttestationQueue};
pub use attester_record::AttesterRecord;
pub use attestation_queue::{AttestationBatch, AttestationQueue, SimpleBatch};
pub use attester_record::{AttesterRecord, IndexedAttesterRecord};
pub use block_queue::BlockQueue;
pub use config::Config;
pub use database::SlasherDB;