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fix DB size estimates for light client data (#6373) 

Addresses two inaccuracies in light client data size documentation:

1. `SyncCommittee` pubkeys serialize are 48 bytes not 64 bytes
2. Some of the estimates used 1000 vs 1024 bytes/KB, aligned to 1024
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Etan Kissling 2024-06-21 14:39:38 +02:00 committed by GitHub
parent 22b5bc6256
commit 31653d5869
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1 changed files with 31 additions and 6 deletions
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beacon_chain/beacon_chain_db_light_client.nim
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@ -26,8 +26,8 @@ logScope: topics = "lcdata"
# needs to be bundled together with other data to fulfill requests.
# Mainnet data size (all columns):
# - Altair: ~38 KB per `SyncCommitteePeriod` (~1.0 MB per month)
# - Capella: ~222 KB per `SyncCommitteePeriod` (~6.1 MB per month)
# - Deneb: ~230 KB per `SyncCommitteePeriod` (~6.3 MB per month)
# - Capella: ~221 KB per `SyncCommitteePeriod` (~6.0 MB per month)
# - Deneb: ~225 KB per `SyncCommitteePeriod` (~6.2 MB per month)
#
# `lc_altair_current_branches` holds Merkle proofs needed to
# construct `LightClientBootstrap` objects.
@ -42,7 +42,7 @@ logScope: topics = "lcdata"
# SSZ because this data does not compress well, and because this data
# needs to be bundled together with other data to fulfill requests.
# Mainnet data size (all columns):
# - Altair ... Deneb: ~32 KB per `SyncCommitteePeriod` (~0.9 MB per month)
# - Altair ... Deneb: ~24 KB per `SyncCommitteePeriod` (~0.7 MB per month)
#
# `lc_best_updates` holds full `LightClientUpdate` objects in SSZ form.
# These objects are frequently queried in bulk, but there is only one per
@ -56,9 +56,9 @@ logScope: topics = "lcdata"
# the fork digest, because the same storage format may be used across forks.
# SSZ storage selected due to the small size and reduced logic complexity.
# Mainnet data size (all columns):
# - Altair: ~33 KB per `SyncCommitteePeriod` (~0.9 MB per month)
# - Capella: ~34 KB per `SyncCommitteePeriod` (~0.9 MB per month)
# - Deneb: ~34 KB per `SyncCommitteePeriod` (~0.9 MB per month)
# - Altair: ~25 KB per `SyncCommitteePeriod` (~0.7 MB per month)
# - Capella: ~26 KB per `SyncCommitteePeriod` (~0.7 MB per month)
# - Deneb: ~26 KB per `SyncCommitteePeriod` (~0.7 MB per month)
#
# `lc_sealed_periods` contains the sync committee periods for which
# full light client data was imported. Data for these periods may no longer
@ -66,6 +66,31 @@ logScope: topics = "lcdata"
# when restarting the program.
# Mainnet data size (all columns):
# - All forks: 8 bytes per `SyncCommitteePeriod` (~0.0 MB per month)
#
# Header computations:
# - Altair: 256*(112+40)/1024*28/1024
# - Capella: 256*(112+4+600+128+40)/1024*28/1024
# 600 = 32+20+32+32+256+32+8+8+8+8+4+32+32+32+32+32
# - Deneb: 256*(112+4+616+128+40)/1024*28/1024
# 616 = 32+20+32+32+256+32+8+8+8+8+4+32+32+32+32+32+8+8
#
# Committee branch computations:
# - Altair: 256*(5*32+8)/1024*28/1024
#
# Finality branch computations:
# - Altair: 256*(6*32+8)/1024*28/1024
#
# Committee computations:
# - Altair: (24624+8)/1024*28/1024
# 513*48 = 24624
#
# Aggregate computations:
# - Altair: 112 = 512/8+48
#
# Update computations:
# - Altair: (112+24624+5*32+112+6*32+112+8+9)/1024*28/1024
# - Capella: (4+884+24624+5*32+4+884+6*32+112+8+9)/1024*28/1024
# - Deneb: (4+900+24624+5*32+4+900+6*32+112+8+9)/1024*28/1024
type
LightClientHeaderStore = object