forked from TrueCloudLab/frostfs-node
282 lines
7.2 KiB
Go
282 lines
7.2 KiB
Go
package writecachebadger
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import (
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"bytes"
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"context"
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"encoding/hex"
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"errors"
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"fmt"
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"time"
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"git.frostfs.info/TrueCloudLab/frostfs-node/internal/logs"
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objectCore "git.frostfs.info/TrueCloudLab/frostfs-node/pkg/core/object"
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"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/blobstor"
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"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/blobstor/common"
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"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/internal/metaerr"
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meta "git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/metabase"
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"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/writecache"
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"git.frostfs.info/TrueCloudLab/frostfs-observability/tracing"
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objectSDK "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object"
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"github.com/dgraph-io/badger/v4"
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"github.com/dgraph-io/ristretto/z"
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"go.opentelemetry.io/otel/attribute"
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"go.opentelemetry.io/otel/trace"
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"go.uber.org/zap"
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)
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const (
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// flushBatchSize is amount of keys which will be read from cache to be flushed
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// to the main storage. It is used to reduce contention between cache put
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// and cache persist.
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flushBatchSize = 512
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// defaultFlushWorkersCount is number of workers for putting objects in main storage.
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defaultFlushWorkersCount = 20
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// defaultFlushInterval is default time interval between successive flushes.
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defaultFlushInterval = time.Second
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)
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type collector struct {
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cache *cache
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scheduled int
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processed int
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cancel func()
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}
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func (c *collector) Send(buf *z.Buffer) error {
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list, err := badger.BufferToKVList(buf)
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if err != nil {
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return err
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}
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for _, kv := range list.Kv {
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select {
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case <-c.cache.closeCh:
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c.cancel()
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return nil
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default:
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}
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if kv.StreamDone {
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return nil
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}
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if c.scheduled >= flushBatchSize {
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c.cancel()
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return nil
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}
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if got, want := len(kv.Key), len(internalKey{}); got != want {
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c.cache.log.Debug(
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fmt.Sprintf("not expected db key len: got %d, want %d", got, want))
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continue
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}
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c.processed++
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obj := objectSDK.New()
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val := bytes.Clone(kv.Value)
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if err = obj.Unmarshal(val); err != nil {
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continue
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}
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addr := objectCore.AddressOf(obj)
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c.cache.scheduled4FlushMtx.RLock()
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_, ok := c.cache.scheduled4Flush[addr]
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c.cache.scheduled4FlushMtx.RUnlock()
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if ok {
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c.cache.log.Debug(logs.WritecacheBadgerObjAlreadyScheduled, zap.Stringer("obj", addr))
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continue
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}
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c.cache.scheduled4FlushMtx.Lock()
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c.cache.scheduled4Flush[addr] = struct{}{}
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c.cache.scheduled4FlushMtx.Unlock()
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c.scheduled++
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select {
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case c.cache.flushCh <- obj:
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case <-c.cache.closeCh:
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c.cancel()
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return nil
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}
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}
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return nil
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}
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// runFlushLoop starts background workers which periodically flush objects to the blobstor.
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func (c *cache) runFlushLoop() {
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for i := 0; i < c.workersCount; i++ {
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c.wg.Add(1)
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go c.workerFlushSmall()
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}
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c.wg.Add(1)
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go func() {
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defer c.wg.Done()
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tt := time.NewTimer(defaultFlushInterval)
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defer tt.Stop()
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for {
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select {
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case <-tt.C:
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c.flushSmallObjects()
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tt.Reset(defaultFlushInterval)
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case <-c.closeCh:
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return
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}
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}
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}()
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}
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func (c *cache) flushSmallObjects() {
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for {
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select {
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case <-c.closeCh:
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return
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default:
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}
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c.modeMtx.RLock()
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if c.readOnly() {
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c.modeMtx.RUnlock()
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time.Sleep(time.Second)
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continue
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}
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// Using the db after Close will panic and badger won't wait for outstanding txs,
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// so we need to check manually.
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if c.db.IsClosed() {
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c.modeMtx.RUnlock()
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return
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}
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ctx, cancel := context.WithCancel(context.TODO())
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coll := collector{
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cache: c,
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cancel: cancel,
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}
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stream := c.db.NewStream()
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// All calls to Send are done by a single goroutine
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stream.Send = coll.Send
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if err := stream.Orchestrate(ctx); err != nil {
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c.log.Debug(fmt.Sprintf(
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"error during flushing object from wc: %s", err))
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}
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c.modeMtx.RUnlock()
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if coll.scheduled == 0 {
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break
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}
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c.log.Debug(logs.WritecacheTriedToFlushItemsFromWritecache,
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zap.Int("scheduled", coll.scheduled), zap.Int("processed", coll.processed))
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}
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}
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func (c *cache) reportFlushError(msg string, addr string, err error) {
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if c.reportError != nil {
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c.reportError(msg, err)
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} else {
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c.log.Error(msg,
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zap.String("address", addr),
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zap.Error(err))
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}
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}
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// workerFlushSmall writes small objects to the main storage.
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func (c *cache) workerFlushSmall() {
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defer c.wg.Done()
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var obj *objectSDK.Object
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for {
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// Give priority to direct put.
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select {
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case obj = <-c.flushCh:
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case <-c.closeCh:
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return
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}
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addr := objectCore.AddressOf(obj)
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err := c.flushObject(context.TODO(), obj, nil, writecache.StorageTypeDB)
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if err == nil {
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c.deleteFromDB([]internalKey{addr2key(addr)})
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}
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c.scheduled4FlushMtx.Lock()
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delete(c.scheduled4Flush, addr)
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c.scheduled4FlushMtx.Unlock()
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}
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}
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// flushObject is used to write object directly to the main storage.
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func (c *cache) flushObject(ctx context.Context, obj *objectSDK.Object, data []byte, st writecache.StorageType) error {
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var err error
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defer func() {
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c.metrics.Flush(err == nil, st)
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}()
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addr := objectCore.AddressOf(obj)
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var prm common.PutPrm
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prm.Object = obj
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prm.RawData = data
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res, err := c.blobstor.Put(ctx, prm)
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if err != nil {
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if !errors.Is(err, common.ErrNoSpace) && !errors.Is(err, common.ErrReadOnly) &&
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!errors.Is(err, blobstor.ErrNoPlaceFound) {
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c.reportFlushError(logs.FrostFSNodeCantFlushObjectToBlobstor,
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addr.EncodeToString(), err)
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}
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return err
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}
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var updPrm meta.UpdateStorageIDPrm
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updPrm.SetAddress(addr)
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updPrm.SetStorageID(res.StorageID)
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_, err = c.metabase.UpdateStorageID(updPrm)
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if err != nil {
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c.reportFlushError(logs.FrostFSNodeCantUpdateObjectStorageID,
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addr.EncodeToString(), err)
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}
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return err
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}
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// Flush flushes all objects from the write-cache to the main storage.
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// Write-cache must be in readonly mode to ensure correctness of an operation and
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// to prevent interference with background flush workers.
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func (c *cache) Flush(ctx context.Context, ignoreErrors bool) error {
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ctx, span := tracing.StartSpanFromContext(ctx, "writecache.Flush",
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trace.WithAttributes(
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attribute.Bool("ignore_errors", ignoreErrors),
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))
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defer span.End()
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c.modeMtx.RLock()
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defer c.modeMtx.RUnlock()
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return c.flush(ctx, ignoreErrors)
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}
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func (c *cache) flush(ctx context.Context, ignoreErrors bool) error {
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return c.db.View(func(tx *badger.Txn) error {
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it := tx.NewIterator(badger.DefaultIteratorOptions)
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defer it.Close()
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var key internalKey
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for it.Rewind(); it.Valid(); it.Next() {
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if got, want := int(it.Item().KeySize()), len(key); got != want {
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err := fmt.Errorf("invalid db key len: got %d, want %d", got, want)
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c.reportFlushError(logs.FrostFSNodeCantDecodeObjectAddressFromDB, hex.EncodeToString(it.Item().Key()), metaerr.Wrap(err))
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if ignoreErrors {
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continue
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}
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return err
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}
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if err := it.Item().Value(func(data []byte) error {
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var obj objectSDK.Object
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if err := obj.Unmarshal(data); err != nil {
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copy(key[:], it.Item().Key())
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c.reportFlushError(logs.FrostFSNodeCantUnmarshalObjectFromDB, key.address().EncodeToString(), metaerr.Wrap(err))
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if ignoreErrors {
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return nil
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}
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return err
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}
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return c.flushObject(ctx, &obj, data, writecache.StorageTypeDB)
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}); err != nil {
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return err
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}
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}
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return nil
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})
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}
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