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core/rawdb: more accurate description of freezer in docs (#30393) 

fixes https://github.com/ethereum/go-ethereum/issues/29793
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rjl493456442 2024-09-13 17:17:40 +08:00 committed by GitHub
parent 7c6b3f9f14
commit c0b5d428a9
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1 changed files with 5 additions and 7 deletions
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12
core/rawdb/freezer.go
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@ -52,13 +52,11 @@ var (
// freezerTableSize defines the maximum size of freezer data files. // freezerTableSize defines the maximum size of freezer data files.
const freezerTableSize = 2 * 1000 * 1000 * 1000 const freezerTableSize = 2 * 1000 * 1000 * 1000
// Freezer is a memory mapped append-only database to store immutable ordered // Freezer is an append-only database to store immutable ordered data into
// data into flat files: // flat files:
// //
// - The append-only nature ensures that disk writes are minimized. // - The append-only nature ensures that disk writes are minimized.
// - The memory mapping ensures we can max out system memory for caching without // - The in-order data ensures that disk reads are always optimized.
// reserving it for go-ethereum. This would also reduce the memory requirements
// of Geth, and thus also GC overhead.
type Freezer struct { type Freezer struct {
frozen atomic.Uint64 // Number of items already frozen frozen atomic.Uint64 // Number of items already frozen
tail atomic.Uint64 // Number of the first stored item in the freezer tail atomic.Uint64 // Number of the first stored item in the freezer
@ -152,7 +150,7 @@ func NewFreezer(datadir string, namespace string, readonly bool, maxTableSize ui
return freezer, nil return freezer, nil
} }
// Close terminates the chain freezer, unmapping all the data files. // Close terminates the chain freezer, closing all the data files.
func (f *Freezer) Close() error { func (f *Freezer) Close() error {
f.writeLock.Lock() f.writeLock.Lock()
defer f.writeLock.Unlock() defer f.writeLock.Unlock()