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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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5
slasher/src/metrics.rs
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@@ -22,6 +22,11 @@ lazy_static! {
"slasher_num_attestations_valid",
"Number of valid attestations per batch"
);
pub static ref SLASHER_NUM_ATTESTATIONS_STORED_PER_BATCH: Result<IntGauge> =
try_create_int_gauge(
"slasher_num_attestations_stored_per_batch",
"Number of attestations stored per batch"
);
pub static ref SLASHER_NUM_BLOCKS_PROCESSED: Result<IntGauge> = try_create_int_gauge(
"slasher_num_blocks_processed",
"Number of blocks processed per batch",