feat:splitstore:Badger GC of hotstore command

api/api_full.go

@@ -183,10 +183,14 @@ type FullNode interface {
 	// nodes.
 	ChainExportRangeInternal(ctx context.Context, head, tail types.TipSetKey, cfg ChainExportConfig) error //perm:admin
 
-	// ChainPrune prunes the stored chain state and garbage collects; only supported if you
+	// ChainPrune forces compaction on cold store and garbage collects; only supported if you
 	// are using the splitstore
 	ChainPrune(ctx context.Context, opts PruneOpts) error //perm:admin
 
+	// ChainHotGC does online (badger) GC on the hot store; only supported if you are using
+	// the splitstore
+	ChainHotGC(ctx context.Context, opts HotGCOpts) error //perm:admin
+
 	// ChainCheckBlockstore performs an (asynchronous) health check on the chain/state blockstore
 	// if supported by the underlying implementation.
 	ChainCheckBlockstore(context.Context) error //perm:admin
@@ -1354,6 +1358,12 @@ type PruneOpts struct {
 	RetainState int64
 }
 
+type HotGCOpts struct {
+	Threshold float64
+	Periodic  bool
+	Moving    bool
+}
+
 type EthTxReceipt struct {
 	TransactionHash   ethtypes.EthHash     `json:"transactionHash"`
 	TransactionIndex  ethtypes.EthUint64   `json:"transactionIndex"`

blockstore/badger/blockstore.go

@@ -20,6 +20,7 @@ import (
 	pool "github.com/libp2p/go-buffer-pool"
 	"github.com/multiformats/go-base32"
 	"go.uber.org/zap"
+	"golang.org/x/xerrors"
 
 	"github.com/filecoin-project/lotus/blockstore"
 )
@@ -44,7 +45,8 @@ const (
 	// MemoryMap is equivalent to badger/options.MemoryMap.
 	MemoryMap = options.MemoryMap
 	// LoadToRAM is equivalent to badger/options.LoadToRAM.
-	LoadToRAM = options.LoadToRAM
+	LoadToRAM          = options.LoadToRAM
+	defaultGCThreshold = 0.125
 )
 
 // Options embeds the badger options themselves, and augments them with
@@ -439,7 +441,7 @@ func (b *Blockstore) deleteDB(path string) {
 	}
 }
 
-func (b *Blockstore) onlineGC() error {
+func (b *Blockstore) onlineGC(ctx context.Context, threshold float64) error {
 	b.lockDB()
 	defer b.unlockDB()
 
@@ -448,14 +450,22 @@ func (b *Blockstore) onlineGC() error {
 	if nworkers < 2 {
 		nworkers = 2
 	}
+	if nworkers > 7 { // max out at 1 goroutine per badger level
+		nworkers = 7
+	}
 
 	err := b.db.Flatten(nworkers)
 	if err != nil {
 		return err
 	}
 
 	for err == nil {
-		err = b.db.RunValueLogGC(0.125)
+		select {
+		case <-ctx.Done():
+			err = ctx.Err()
+		default:
+			err = b.db.RunValueLogGC(threshold)
+		}
 	}
 
 	if err == badger.ErrNoRewrite {
@@ -468,7 +478,7 @@ func (b *Blockstore) onlineGC() error {
 
 // CollectGarbage compacts and runs garbage collection on the value log;
 // implements the BlockstoreGC trait
-func (b *Blockstore) CollectGarbage(opts ...blockstore.BlockstoreGCOption) error {
+func (b *Blockstore) CollectGarbage(ctx context.Context, opts ...blockstore.BlockstoreGCOption) error {
 	if err := b.access(); err != nil {
 		return err
 	}
@@ -485,8 +495,48 @@ func (b *Blockstore) CollectGarbage(opts ...blockstore.BlockstoreGCOption) error
 	if options.FullGC {
 		return b.movingGC()
 	}
+	threshold := options.Threshold
+	if threshold == 0 {
+		threshold = defaultGCThreshold
+	}
+	return b.onlineGC(ctx, threshold)
+}
+
+// GCOnce runs garbage collection on the value log;
+// implements BlockstoreGCOnce trait
+func (b *Blockstore) GCOnce(ctx context.Context, opts ...blockstore.BlockstoreGCOption) error {
+	if err := b.access(); err != nil {
+		return err
+	}
+	defer b.viewers.Done()
 
-	return b.onlineGC()
+	var options blockstore.BlockstoreGCOptions
+	for _, opt := range opts {
+		err := opt(&options)
+		if err != nil {
+			return err
+		}
+	}
+	if options.FullGC {
+		return xerrors.Errorf("FullGC option specified for GCOnce but full GC is non incremental")
+	}
+
+	threshold := options.Threshold
+	if threshold == 0 {
+		threshold = defaultGCThreshold
+	}
+
+	b.lockDB()
+	defer b.unlockDB()
+
+	// Note no compaction needed before single GC as we will hit at most one vlog anyway
+	err := b.db.RunValueLogGC(threshold)
+	if err == badger.ErrNoRewrite {
+		// not really an error in this case, it signals the end of GC
+		return nil
+	}
+
+	return err
 }
 
 // Size returns the aggregate size of the blockstore

blockstore/badger/blockstore_test.go

@@ -145,7 +145,7 @@ func testMove(t *testing.T, optsF func(string) Options) {
 		return nil
 	})
 	g.Go(func() error {
-		return db.CollectGarbage(blockstore.WithFullGC(true))
+		return db.CollectGarbage(ctx, blockstore.WithFullGC(true))
 	})
 
 	err = g.Wait()
@@ -230,7 +230,7 @@ func testMove(t *testing.T, optsF func(string) Options) {
 	checkPath()
 
 	// now do another FullGC to test the double move and following of symlinks
-	if err := db.CollectGarbage(blockstore.WithFullGC(true)); err != nil {
+	if err := db.CollectGarbage(ctx, blockstore.WithFullGC(true)); err != nil {
 		t.Fatal(err)
 	}
 

blockstore/blockstore.go

@@ -36,7 +36,12 @@ type BlockstoreIterator interface {
 
 // BlockstoreGC is a trait for blockstores that support online garbage collection
 type BlockstoreGC interface {
-	CollectGarbage(options ...BlockstoreGCOption) error
+	CollectGarbage(ctx context.Context, options ...BlockstoreGCOption) error
+}
+
+// BlockstoreGCOnce is a trait for a blockstore that supports incremental online garbage collection
+type BlockstoreGCOnce interface {
+	GCOnce(ctx context.Context, options ...BlockstoreGCOption) error
 }
 
 // BlockstoreGCOption is a functional interface for controlling blockstore GC options
@@ -45,6 +50,8 @@ type BlockstoreGCOption = func(*BlockstoreGCOptions) error
 // BlockstoreGCOptions is a struct with GC options
 type BlockstoreGCOptions struct {
 	FullGC bool
+	// fraction of garbage in badger vlog before its worth processing in online GC
+	Threshold float64
 }
 
 func WithFullGC(fullgc bool) BlockstoreGCOption {
@@ -54,6 +61,13 @@ func WithFullGC(fullgc bool) BlockstoreGCOption {
 	}
 }
 
+func WithThreshold(threshold float64) BlockstoreGCOption {
+	return func(opts *BlockstoreGCOptions) error {
+		opts.Threshold = threshold
+		return nil
+	}
+}
+
 // BlockstoreSize is a trait for on-disk blockstores that can report their size
 type BlockstoreSize interface {
 	Size() (int64, error)

blockstore/splitstore/splitstore_compact.go

@@ -794,7 +794,7 @@ func (s *SplitStore) doCompact(curTs *types.TipSet) error {
 
 	// we are done; do some housekeeping
 	s.endTxnProtect()
-	s.gcHotstore()
+	s.gcHotAfterCompaction()
 
 	err = s.setBaseEpoch(boundaryEpoch)
 	if err != nil {

blockstore/splitstore/splitstore_gc.go

@@ -7,7 +7,7 @@ import (
 	bstore "github.com/filecoin-project/lotus/blockstore"
 )
 
-func (s *SplitStore) gcHotstore() {
+func (s *SplitStore) gcHotAfterCompaction() {
 	var opts []bstore.BlockstoreGCOption
 	if s.cfg.HotStoreFullGCFrequency > 0 && s.compactionIndex%int64(s.cfg.HotStoreFullGCFrequency) == 0 {
 		opts = append(opts, bstore.WithFullGC(true))
@@ -23,7 +23,7 @@ func (s *SplitStore) gcBlockstore(b bstore.Blockstore, opts []bstore.BlockstoreG
 		log.Info("garbage collecting blockstore")
 		startGC := time.Now()
 
-		if err := gc.CollectGarbage(opts...); err != nil {
+		if err := gc.CollectGarbage(s.ctx, opts...); err != nil {
 			return err
 		}
 
@@ -33,3 +33,19 @@ func (s *SplitStore) gcBlockstore(b bstore.Blockstore, opts []bstore.BlockstoreG
 
 	return fmt.Errorf("blockstore doesn't support garbage collection: %T", b)
 }
+
+func (s *SplitStore) gcBlockstoreOnce(b bstore.Blockstore, opts []bstore.BlockstoreGCOption) error {
+	if gc, ok := b.(bstore.BlockstoreGCOnce); ok {
+		log.Debug("gc blockstore once")
+		startGC := time.Now()
+
+		if err := gc.GCOnce(s.ctx, opts...); err != nil {
+			return err
+		}
+
+		log.Debugw("gc blockstore once done", "took", time.Since(startGC))
+		return nil
+	}
+
+	return fmt.Errorf("blockstore doesn't support gc once: %T", b)
+}

blockstore/splitstore/splitstore_prune.go

@@ -47,6 +47,23 @@ var (
 	PruneThreshold = 7 * build.Finality
 )
 
+// GCHotstore runs online GC on the chain state in the hotstore according the to options specified
+func (s *SplitStore) GCHotStore(opts api.HotGCOpts) error {
+	if opts.Moving {
+		gcOpts := []bstore.BlockstoreGCOption{bstore.WithFullGC(true)}
+		return s.gcBlockstore(s.hot, gcOpts)
+	}
+
+	gcOpts := []bstore.BlockstoreGCOption{bstore.WithThreshold(opts.Threshold)}
+	var err error
+	if opts.Periodic {
+		err = s.gcBlockstore(s.hot, gcOpts)
+	} else {
+		err = s.gcBlockstoreOnce(s.hot, gcOpts)
+	}
+	return err
+}
+
 // PruneChain instructs the SplitStore to prune chain state in the coldstore, according to the
 // options specified.
 func (s *SplitStore) PruneChain(opts api.PruneOpts) error {

cli/chain.go

@@ -1591,7 +1591,64 @@ func createExportFile(app *cli.App, path string) (io.WriteCloser, error) {
 
 var ChainPruneCmd = &cli.Command{
 	Name:  "prune",
-	Usage: "prune the stored chain state and perform garbage collection",
+	Usage: "splitstore gc",
+	Subcommands: []*cli.Command{
+		chainPruneColdCmd,
+		chainPruneHotGCCmd,
+		chainPruneHotMovingGCCmd,
+	},
+}
+
+var chainPruneHotGCCmd = &cli.Command{
+	Name:  "hot",
+	Usage: "run online (badger vlog) garbage collection on hotstore",
+	Flags: []cli.Flag{
+		&cli.Float64Flag{Name: "threshold", Value: 0.01, Usage: "Threshold of vlog garbage for gc"},
+		&cli.BoolFlag{Name: "periodic", Value: false, Usage: "Run periodic gc over multiple vlogs. Otherwise run gc once"},
+	},
+	Action: func(cctx *cli.Context) error {
+		api, closer, err := GetFullNodeAPIV1(cctx)
+		if err != nil {
+			return err
+		}
+		defer closer()
+		ctx := ReqContext(cctx)
+		opts := lapi.HotGCOpts{}
+		opts.Periodic = cctx.Bool("periodic")
+		opts.Threshold = cctx.Float64("threshold")
+
+		gcStart := time.Now()
+		err = api.ChainHotGC(ctx, opts)
+		gcTime := time.Since(gcStart)
+		fmt.Printf("Online GC took %v (periodic <%t> threshold <%f>)", gcTime, opts.Periodic, opts.Threshold)
+		return err
+	},
+}
+
+var chainPruneHotMovingGCCmd = &cli.Command{
+	Name:  "hot-moving",
+	Usage: "run moving gc on hotstore",
+	Action: func(cctx *cli.Context) error {
+		api, closer, err := GetFullNodeAPIV1(cctx)
+		if err != nil {
+			return err
+		}
+		defer closer()
+		ctx := ReqContext(cctx)
+		opts := lapi.HotGCOpts{}
+		opts.Moving = true
+
+		gcStart := time.Now()
+		err = api.ChainHotGC(ctx, opts)
+		gcTime := time.Since(gcStart)
+		fmt.Printf("Moving GC took %v", gcTime)
+		return err
+	},
+}
+
+var chainPruneColdCmd = &cli.Command{
+	Name:  "compact-cold",
+	Usage: "force splitstore compaction on cold store state and run gc",
 	Flags: []cli.Flag{
 		&cli.BoolFlag{
 			Name:  "online-gc",