les: historical data garbage collection (#19570)

This change introduces garbage collection for the light client. Historical
chain data is deleted periodically. If you want to disable the GC, use
the --light.nopruning flag.
This commit is contained in:
gary rong
2020-07-13 17:02:54 +08:00
committed by GitHub
parent b8dd0890b3
commit 6eef141aef
45 changed files with 841 additions and 213 deletions

View File

@ -53,9 +53,15 @@ const (
// CheckpointProcessConfirmations is the number before a checkpoint is generated
CheckpointProcessConfirmations = 256
// ImmutabilityThreshold is the number of blocks after which a chain segment is
// FullImmutabilityThreshold is the number of blocks after which a chain segment is
// considered immutable (i.e. soft finality). It is used by the downloader as a
// hard limit against deep ancestors, by the blockchain against deep reorgs, by
// the freezer as the cutoff threshold and by clique as the snapshot trust limit.
ImmutabilityThreshold = 90000
FullImmutabilityThreshold = 90000
// LightImmutabilityThreshold is the number of blocks after which a header chain
// segment is considered immutable for light client(i.e. soft finality). It is used by
// the downloader as a hard limit against deep ancestors, by the blockchain against deep
// reorgs, by the light pruner as the pruning validity guarantee.
LightImmutabilityThreshold = 30000
)