frostfs-node/pkg/local_object_storage/writecache/writecachebadger/gc.go

package writecachebadger

import (
	"context"
	"time"

	"git.frostfs.info/TrueCloudLab/frostfs-node/internal/logs"
)

func (c *cache) runGCLoop(ctx context.Context) {
	c.wg.Add(1)

	go func() {
		defer c.wg.Done()

		t := time.NewTicker(c.gcInterval)
		defer t.Stop()

		for {
			select {
			case <-ctx.Done():
				return
			case <-t.C:
				c.runGC()
			}
		}
	}()
}

func (c *cache) runGC() {
	// This serves to synchronize the c.db field when changing mode as well.
	c.modeMtx.RLock()
	defer c.modeMtx.RUnlock()

	ro := c.readOnly()
	if ro {
		return
	}

	// 0.5 is the recommended value so that write amplification of the value log is 2.
	// See https://pkg.go.dev/github.com/dgraph-io/badger/v4#DB.RunValueLogGC for more info.
	for c.db.RunValueLogGC(0.5) == nil {
		c.log.Debug(logs.WritecacheDBValueLogGCRunCompleted)
	}
}