frostfs-node/pkg/local_object_storage/engine/shards.go
Anton Nikiforov edb1428248 [] Add metric readonly to get shards mode
Signed-off-by: Anton Nikiforov <an.nikiforov@yadro.com>
2022-12-30 11:07:35 +03:00

274 lines
6.1 KiB
Go

package engine
import (
"fmt"
"github.com/TrueCloudLab/frostfs-node/pkg/local_object_storage/shard"
"github.com/TrueCloudLab/frostfs-node/pkg/local_object_storage/shard/mode"
"github.com/TrueCloudLab/frostfs-node/pkg/local_object_storage/util/logicerr"
oid "github.com/TrueCloudLab/frostfs-sdk-go/object/id"
"github.com/TrueCloudLab/hrw"
"github.com/google/uuid"
"github.com/panjf2000/ants/v2"
"go.uber.org/atomic"
"go.uber.org/zap"
)
var errShardNotFound = logicerr.New("shard not found")
type hashedShard shardWrapper
type metricsWithID struct {
id string
mw MetricRegister
}
func (m *metricsWithID) SetShardID(id string) {
// concurrent settings are not expected =>
// no mutex protection
m.id = id
}
func (m *metricsWithID) SetObjectCounter(objectType string, v uint64) {
m.mw.SetObjectCounter(m.id, objectType, v)
}
func (m *metricsWithID) AddToObjectCounter(objectType string, delta int) {
m.mw.AddToObjectCounter(m.id, objectType, delta)
}
func (m *metricsWithID) IncObjectCounter(objectType string) {
m.mw.AddToObjectCounter(m.id, objectType, +1)
}
func (m *metricsWithID) DecObjectCounter(objectType string) {
m.mw.AddToObjectCounter(m.id, objectType, -1)
}
func (m *metricsWithID) SetReadonly(readonly bool) {
m.mw.SetReadonly(m.id, readonly)
}
// AddShard adds a new shard to the storage engine.
//
// Returns any error encountered that did not allow adding a shard.
// Otherwise returns the ID of the added shard.
func (e *StorageEngine) AddShard(opts ...shard.Option) (*shard.ID, error) {
sh, err := e.createShard(opts)
if err != nil {
return nil, fmt.Errorf("could not create a shard: %w", err)
}
err = e.addShard(sh)
if err != nil {
return nil, fmt.Errorf("could not add %s shard: %w", sh.ID().String(), err)
}
if e.cfg.metrics != nil {
e.cfg.metrics.SetReadonly(sh.ID().String(), sh.GetMode() != mode.ReadWrite)
}
return sh.ID(), nil
}
func (e *StorageEngine) createShard(opts []shard.Option) (*shard.Shard, error) {
id, err := generateShardID()
if err != nil {
return nil, fmt.Errorf("could not generate shard ID: %w", err)
}
e.mtx.RLock()
if e.metrics != nil {
opts = append(opts, shard.WithMetricsWriter(
&metricsWithID{
id: id.String(),
mw: e.metrics,
},
))
}
e.mtx.RUnlock()
sh := shard.New(append(opts,
shard.WithID(id),
shard.WithExpiredTombstonesCallback(e.processExpiredTombstones),
shard.WithExpiredLocksCallback(e.processExpiredLocks),
shard.WithDeletedLockCallback(e.processDeletedLocks),
shard.WithReportErrorFunc(e.reportShardErrorBackground),
)...)
if err := sh.UpdateID(); err != nil {
return nil, fmt.Errorf("could not update shard ID: %w", err)
}
return sh, err
}
func (e *StorageEngine) addShard(sh *shard.Shard) error {
e.mtx.Lock()
defer e.mtx.Unlock()
pool, err := ants.NewPool(int(e.shardPoolSize), ants.WithNonblocking(true))
if err != nil {
return fmt.Errorf("could not create pool: %w", err)
}
strID := sh.ID().String()
if _, ok := e.shards[strID]; ok {
return fmt.Errorf("shard with id %s was already added", strID)
}
e.shards[strID] = shardWrapper{
errorCount: atomic.NewUint32(0),
Shard: sh,
}
e.shardPools[strID] = pool
return nil
}
// removeShards removes specified shards. Skips non-existent shards.
// Logs errors about shards that it could not Close after the removal.
func (e *StorageEngine) removeShards(ids ...string) {
if len(ids) == 0 {
return
}
ss := make([]shardWrapper, 0, len(ids))
e.mtx.Lock()
for _, id := range ids {
sh, found := e.shards[id]
if !found {
continue
}
ss = append(ss, sh)
delete(e.shards, id)
pool, ok := e.shardPools[id]
if ok {
pool.Release()
delete(e.shardPools, id)
}
e.log.Info("shard has been removed",
zap.String("id", id))
}
e.mtx.Unlock()
for _, sh := range ss {
err := sh.Close()
if err != nil {
e.log.Error("could not close removed shard",
zap.Stringer("id", sh.ID()),
zap.Error(err),
)
}
}
}
func generateShardID() (*shard.ID, error) {
uid, err := uuid.NewRandom()
if err != nil {
return nil, err
}
bin, err := uid.MarshalBinary()
if err != nil {
return nil, err
}
return shard.NewIDFromBytes(bin), nil
}
func (e *StorageEngine) shardWeight(sh *shard.Shard) float64 {
weightValues := sh.WeightValues()
return float64(weightValues.FreeSpace)
}
func (e *StorageEngine) sortShardsByWeight(objAddr interface{ EncodeToString() string }) []hashedShard {
e.mtx.RLock()
defer e.mtx.RUnlock()
shards := make([]hashedShard, 0, len(e.shards))
weights := make([]float64, 0, len(e.shards))
for _, sh := range e.shards {
shards = append(shards, hashedShard(sh))
weights = append(weights, e.shardWeight(sh.Shard))
}
hrw.SortSliceByWeightValue(shards, weights, hrw.Hash([]byte(objAddr.EncodeToString())))
return shards
}
func (e *StorageEngine) unsortedShards() []hashedShard {
e.mtx.RLock()
defer e.mtx.RUnlock()
shards := make([]hashedShard, 0, len(e.shards))
for _, sh := range e.shards {
shards = append(shards, hashedShard(sh))
}
return shards
}
func (e *StorageEngine) iterateOverSortedShards(addr oid.Address, handler func(int, hashedShard) (stop bool)) {
for i, sh := range e.sortShardsByWeight(addr) {
if handler(i, sh) {
break
}
}
}
func (e *StorageEngine) iterateOverUnsortedShards(handler func(hashedShard) (stop bool)) {
for _, sh := range e.unsortedShards() {
if handler(sh) {
break
}
}
}
// SetShardMode sets mode of the shard with provided identifier.
//
// Returns an error if shard mode was not set, or shard was not found in storage engine.
func (e *StorageEngine) SetShardMode(id *shard.ID, m mode.Mode, resetErrorCounter bool) error {
e.mtx.RLock()
defer e.mtx.RUnlock()
for shID, sh := range e.shards {
if id.String() == shID {
if resetErrorCounter {
sh.errorCount.Store(0)
}
return sh.SetMode(m)
}
}
return errShardNotFound
}
// HandleNewEpoch notifies every shard about NewEpoch event.
func (e *StorageEngine) HandleNewEpoch(epoch uint64) {
ev := shard.EventNewEpoch(epoch)
e.mtx.RLock()
defer e.mtx.RUnlock()
for _, sh := range e.shards {
sh.NotificationChannel() <- ev
}
}
func (s hashedShard) Hash() uint64 {
return hrw.Hash(
[]byte(s.Shard.ID().String()),
)
}