frostfs-node/pkg/services/tree/sync.go
Evgenii Stratonikov 79d59e4ed2
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[#266] services/tree: Do not accept requests until initial sync is finished
`Apply` is deliberately left out -- we don't want to miss anything new.

Signed-off-by: Evgenii Stratonikov <e.stratonikov@yadro.com>
2023-04-18 13:30:45 +03:00

429 lines
10 KiB
Go

package tree
import (
"context"
"crypto/sha256"
"errors"
"fmt"
"io"
"math"
"math/rand"
"sync"
"git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/pkg/tracing"
"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/pilorama"
"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/morph/client/netmap"
"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/network"
cid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/container/id"
netmapSDK "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/netmap"
"github.com/panjf2000/ants/v2"
"go.uber.org/zap"
"golang.org/x/sync/errgroup"
"google.golang.org/grpc"
"google.golang.org/grpc/credentials/insecure"
)
// ErrNotInContainer is returned when operation could not be performed
// because the node is not included in the container.
var ErrNotInContainer = errors.New("node is not in container")
const defaultSyncWorkerCount = 20
// synchronizeAllTrees synchronizes all the trees of the container. It fetches
// tree IDs from the other container nodes. Returns ErrNotInContainer if the node
// is not included in the container.
func (s *Service) synchronizeAllTrees(ctx context.Context, cid cid.ID) error {
nodes, pos, err := s.getContainerNodes(cid)
if err != nil {
return fmt.Errorf("can't get container nodes: %w", err)
}
if pos < 0 {
return ErrNotInContainer
}
nodes = randomizeNodeOrder(nodes, pos)
if len(nodes) == 0 {
return nil
}
rawCID := make([]byte, sha256.Size)
cid.Encode(rawCID)
req := &TreeListRequest{
Body: &TreeListRequest_Body{
ContainerId: rawCID,
},
}
err = SignMessage(req, s.key)
if err != nil {
return fmt.Errorf("could not sign request: %w", err)
}
var resp *TreeListResponse
var treesToSync []string
var outErr error
err = s.forEachNode(ctx, nodes, func(c TreeServiceClient) bool {
resp, outErr = c.TreeList(ctx, req)
if outErr != nil {
return false
}
treesToSync = resp.GetBody().GetIds()
return true
})
if err != nil {
outErr = err
}
if outErr != nil {
return fmt.Errorf("could not fetch tree ID list: %w", outErr)
}
for _, tid := range treesToSync {
h, err := s.forest.TreeLastSyncHeight(cid, tid)
if err != nil && !errors.Is(err, pilorama.ErrTreeNotFound) {
s.log.Warn("could not get last synchronized height for a tree",
zap.Stringer("cid", cid),
zap.String("tree", tid))
continue
}
newHeight := s.synchronizeTree(ctx, cid, h, tid, nodes)
if h < newHeight {
if err := s.forest.TreeUpdateLastSyncHeight(cid, tid, newHeight); err != nil {
s.log.Warn("could not update last synchronized height for a tree",
zap.Stringer("cid", cid),
zap.String("tree", tid))
}
}
}
return nil
}
// SynchronizeTree tries to synchronize log starting from the last stored height.
func (s *Service) SynchronizeTree(ctx context.Context, cid cid.ID, treeID string) error {
nodes, pos, err := s.getContainerNodes(cid)
if err != nil {
return fmt.Errorf("can't get container nodes: %w", err)
}
if pos < 0 {
return ErrNotInContainer
}
nodes = randomizeNodeOrder(nodes, pos)
if len(nodes) == 0 {
return nil
}
s.synchronizeTree(ctx, cid, 0, treeID, nodes)
return nil
}
func (s *Service) synchronizeTree(ctx context.Context, cid cid.ID, from uint64,
treeID string, nodes []netmapSDK.NodeInfo) uint64 {
s.log.Debug("synchronize tree",
zap.Stringer("cid", cid),
zap.String("tree", treeID),
zap.Uint64("from", from))
errGroup, egCtx := errgroup.WithContext(ctx)
const workersCount = 4
errGroup.SetLimit(workersCount)
heights := make([]uint64, len(nodes))
for i, n := range nodes {
i := i
n := n
errGroup.Go(func() error {
height := from
n.IterateNetworkEndpoints(func(addr string) bool {
var a network.Address
if err := a.FromString(addr); err != nil {
return false
}
cc, err := grpc.DialContext(egCtx, a.URIAddr(),
grpc.WithChainUnaryInterceptor(
tracing.NewGRPCUnaryClientInteceptor(),
),
grpc.WithChainStreamInterceptor(
tracing.NewGRPCStreamClientInterceptor(),
),
grpc.WithTransportCredentials(insecure.NewCredentials()))
if err != nil {
// Failed to connect, try the next address.
return false
}
defer cc.Close()
treeClient := NewTreeServiceClient(cc)
for {
h, err := s.synchronizeSingle(egCtx, cid, treeID, height, treeClient)
if height < h {
height = h
}
if err != nil || h <= height {
// Error with the response, try the next node.
return true
}
}
})
if height <= from { // do not increase starting height on fail
heights[i] = from
return nil
}
heights[i] = height
return nil
})
}
if err := errGroup.Wait(); err != nil {
s.log.Warn("failed to run tree synchronization over all nodes", zap.Error(err))
}
newHeight := uint64(math.MaxUint64)
for _, height := range heights { // take minimum across all clients
if height < newHeight {
newHeight = height
}
}
if newHeight == math.MaxUint64 {
newHeight = from
}
return newHeight
}
func (s *Service) synchronizeSingle(ctx context.Context, cid cid.ID, treeID string, height uint64, treeClient TreeServiceClient) (uint64, error) {
rawCID := make([]byte, sha256.Size)
cid.Encode(rawCID)
errG, ctx := errgroup.WithContext(ctx)
errG.SetLimit(1024)
var heightMtx sync.Mutex
for {
newHeight := height
req := &GetOpLogRequest{
Body: &GetOpLogRequest_Body{
ContainerId: rawCID,
TreeId: treeID,
Height: newHeight,
},
}
if err := SignMessage(req, s.key); err != nil {
_ = errG.Wait()
return newHeight, err
}
c, err := treeClient.GetOpLog(ctx, req)
if err != nil {
_ = errG.Wait()
return newHeight, fmt.Errorf("can't initialize client: %w", err)
}
res, err := c.Recv()
for ; err == nil; res, err = c.Recv() {
lm := res.GetBody().GetOperation()
m := &pilorama.Move{
Parent: lm.ParentId,
Child: lm.ChildId,
}
if err := m.Meta.FromBytes(lm.Meta); err != nil {
_ = errG.Wait()
return newHeight, err
}
errG.Go(func() error {
err := s.forest.TreeApply(cid, treeID, m, true)
heightMtx.Lock()
defer heightMtx.Unlock()
if err != nil {
if newHeight > height {
height = newHeight
}
return err
}
if m.Time > newHeight {
newHeight = m.Time + 1
} else {
newHeight++
}
return nil
})
}
applyErr := errG.Wait()
if err == nil {
err = applyErr
}
heightMtx.Lock()
if height == newHeight || err != nil && !errors.Is(err, io.EOF) {
heightMtx.Unlock()
return newHeight, err
}
height = newHeight
heightMtx.Unlock()
}
}
// ErrAlreadySyncing is returned when a service synchronization has already
// been started.
var ErrAlreadySyncing = errors.New("service is being synchronized")
// ErrShuttingDown is returned when the service is shitting down and could not
// accept any calls.
var ErrShuttingDown = errors.New("service is shutting down")
// SynchronizeAll forces tree service to synchronize all the trees according to
// netmap information. Must not be called before Service.Start.
// Returns ErrAlreadySyncing if synchronization has been started and blocked
// by another routine.
// Note: non-blocking operation.
func (s *Service) SynchronizeAll() error {
select {
case <-s.closeCh:
return ErrShuttingDown
default:
}
select {
case s.syncChan <- struct{}{}:
return nil
default:
return ErrAlreadySyncing
}
}
func (s *Service) syncLoop(ctx context.Context) {
for {
select {
case <-s.closeCh:
return
case <-ctx.Done():
return
case <-s.syncChan:
s.log.Debug("syncing trees...")
cnrs, err := s.cfg.cnrSource.List()
if err != nil {
s.log.Error("could not fetch containers", zap.Error(err))
break
}
newMap, cnrsToSync := s.containersToSync(cnrs)
s.syncContainers(ctx, cnrsToSync)
s.removeContainers(ctx, newMap)
s.log.Debug("trees have been synchronized")
}
s.initialSyncDone.Store(true)
}
}
func (s *Service) syncContainers(ctx context.Context, cnrs []cid.ID) {
// sync new containers
var wg sync.WaitGroup
for _, cnr := range cnrs {
wg.Add(1)
cnr := cnr
err := s.syncPool.Submit(func() {
defer wg.Done()
s.log.Debug("syncing container trees...", zap.Stringer("cid", cnr))
err := s.synchronizeAllTrees(ctx, cnr)
if err != nil {
s.log.Error("could not sync trees", zap.Stringer("cid", cnr), zap.Error(err))
return
}
s.log.Debug("container trees have been synced", zap.Stringer("cid", cnr))
})
if err != nil {
wg.Done()
s.log.Error("could not query trees for synchronization",
zap.Stringer("cid", cnr),
zap.Error(err))
if errors.Is(err, ants.ErrPoolClosed) {
return
}
}
}
wg.Wait()
}
func (s *Service) removeContainers(ctx context.Context, newContainers map[cid.ID]struct{}) {
s.cnrMapMtx.Lock()
defer s.cnrMapMtx.Unlock()
var removed []cid.ID
for cnr := range s.cnrMap {
if _, ok := newContainers[cnr]; ok {
continue
}
removed = append(removed, cnr)
}
for i := range removed {
delete(s.cnrMap, removed[i])
}
for _, cnr := range removed {
s.log.Debug("removing redundant trees...", zap.Stringer("cid", cnr))
err := s.DropTree(ctx, cnr, "")
if err != nil {
s.log.Error("could not remove redundant tree",
zap.Stringer("cid", cnr),
zap.Error(err))
}
}
}
func (s *Service) containersToSync(cnrs []cid.ID) (map[cid.ID]struct{}, []cid.ID) {
newMap := make(map[cid.ID]struct{}, len(s.cnrMap))
cnrsToSync := make([]cid.ID, 0, len(cnrs))
for _, cnr := range cnrs {
_, pos, err := s.getContainerNodes(cnr)
if err != nil {
s.log.Error("could not calculate container nodes",
zap.Stringer("cid", cnr),
zap.Error(err))
continue
}
if pos < 0 {
// node is not included in the container.
continue
}
newMap[cnr] = struct{}{}
cnrsToSync = append(cnrsToSync, cnr)
}
return newMap, cnrsToSync
}
// randomizeNodeOrder shuffles nodes and removes not a `pos` index.
// It is assumed that 0 <= pos < len(nodes).
func randomizeNodeOrder(cnrNodes []netmap.NodeInfo, pos int) []netmap.NodeInfo {
if len(cnrNodes) == 1 {
return nil
}
nodes := make([]netmap.NodeInfo, len(cnrNodes)-1)
n := copy(nodes, cnrNodes[:pos])
copy(nodes[n:], cnrNodes[pos+1:])
rand.Shuffle(len(nodes), func(i, j int) {
nodes[i], nodes[j] = nodes[j], nodes[i]
})
return nodes
}