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core/state: maintain one more diff layer (#21730)

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* core/state: maintain one more diff layer

* core/state: address comment
This commit is contained in:
gary rong 2020-10-28 20:00:22 +08:00 committed by GitHub
parent 296a27d106
commit 18145adf08
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1 changed files with 6 additions and 2 deletions
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8
core/state/statedb.go
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@ -881,8 +881,12 @@ func (s *StateDB) Commit(deleteEmptyObjects bool) (common.Hash, error) {
if err := s.snaps.Update(root, parent, s.snapDestructs, s.snapAccounts, s.snapStorage); err != nil {
log.Warn("Failed to update snapshot tree", "from", parent, "to", root, "err", err)
}
if err := s.snaps.Cap(root, 127); err != nil { // Persistent layer is 128th, the last available trie
log.Warn("Failed to cap snapshot tree", "root", root, "layers", 127, "err", err)
// Keep 128 diff layers in the memory, persistent layer is 129th.
// - head layer is paired with HEAD state
// - head-1 layer is paired with HEAD-1 state
// - head-127 layer(bottom-most diff layer) is paired with HEAD-127 state
if err := s.snaps.Cap(root, 128); err != nil {
log.Warn("Failed to cap snapshot tree", "root", root, "layers", 128, "err", err)
}
}
s.snap, s.snapDestructs, s.snapAccounts, s.snapStorage = nil, nil, nil, nil