/
multitsdb.go
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/
multitsdb.go
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// Copyright (c) The Thanos Authors.
// Licensed under the Apache License 2.0.
package receive
import (
"context"
"io/ioutil"
"os"
"path"
"sync"
"github.com/go-kit/kit/log"
"github.com/go-kit/kit/log/level"
"github.com/pkg/errors"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/prometheus/pkg/labels"
"github.com/prometheus/prometheus/storage"
"github.com/prometheus/prometheus/tsdb"
terrors "github.com/prometheus/prometheus/tsdb/errors"
"github.com/thanos-io/thanos/pkg/block/metadata"
"github.com/thanos-io/thanos/pkg/component"
"github.com/thanos-io/thanos/pkg/objstore"
"github.com/thanos-io/thanos/pkg/shipper"
"github.com/thanos-io/thanos/pkg/store"
"github.com/thanos-io/thanos/pkg/store/storepb"
"golang.org/x/sync/errgroup"
)
type MultiTSDB struct {
dataDir string
logger log.Logger
reg prometheus.Registerer
tsdbOpts *tsdb.Options
tenantLabelName string
labels labels.Labels
bucket objstore.Bucket
mtx *sync.RWMutex
tenants map[string]*tenant
allowOutOfOrderUpload bool
}
func NewMultiTSDB(
dataDir string,
l log.Logger,
reg prometheus.Registerer,
tsdbOpts *tsdb.Options,
labels labels.Labels,
tenantLabelName string,
bucket objstore.Bucket,
allowOutOfOrderUpload bool,
) *MultiTSDB {
if l == nil {
l = log.NewNopLogger()
}
return &MultiTSDB{
dataDir: dataDir,
logger: l,
reg: reg,
tsdbOpts: tsdbOpts,
mtx: &sync.RWMutex{},
tenants: map[string]*tenant{},
labels: labels,
tenantLabelName: tenantLabelName,
bucket: bucket,
allowOutOfOrderUpload: allowOutOfOrderUpload,
}
}
type tenant struct {
readyS *ReadyStorage
storeTSDB *store.TSDBStore
ship *shipper.Shipper
mtx *sync.RWMutex
}
func newTenant() *tenant {
return &tenant{
readyS: &ReadyStorage{},
mtx: &sync.RWMutex{},
}
}
func (t *tenant) readyStorage() *ReadyStorage {
return t.readyS
}
func (t *tenant) store() *store.TSDBStore {
t.mtx.RLock()
defer t.mtx.RUnlock()
return t.storeTSDB
}
func (t *tenant) shipper() *shipper.Shipper {
t.mtx.RLock()
defer t.mtx.RUnlock()
return t.ship
}
func (t *tenant) set(storeTSDB *store.TSDBStore, tenantTSDB *tsdb.DB, ship *shipper.Shipper) {
t.readyS.Set(tenantTSDB)
t.mtx.Lock()
t.storeTSDB = storeTSDB
t.ship = ship
t.mtx.Unlock()
}
func (t *MultiTSDB) Open() error {
if err := os.MkdirAll(t.dataDir, 0777); err != nil {
return err
}
files, err := ioutil.ReadDir(t.dataDir)
if err != nil {
return err
}
var g errgroup.Group
for _, f := range files {
f := f
if !f.IsDir() {
continue
}
g.Go(func() error {
_, err := t.getOrLoadTenant(f.Name(), true)
return err
})
}
return g.Wait()
}
func (t *MultiTSDB) Flush() error {
t.mtx.RLock()
defer t.mtx.RUnlock()
errmtx := &sync.Mutex{}
merr := terrors.MultiError{}
wg := &sync.WaitGroup{}
for id, tenant := range t.tenants {
db := tenant.readyStorage().Get()
if db == nil {
level.Error(t.logger).Log("msg", "flushing TSDB failed; not ready", "tenant", id)
continue
}
level.Info(t.logger).Log("msg", "flushing TSDB", "tenant", id)
wg.Add(1)
go func() {
head := db.Head()
if err := db.CompactHead(tsdb.NewRangeHead(head, head.MinTime(), head.MaxTime()-1)); err != nil {
errmtx.Lock()
merr.Add(err)
errmtx.Unlock()
}
wg.Done()
}()
}
wg.Wait()
return merr.Err()
}
func (t *MultiTSDB) Close() error {
t.mtx.Lock()
defer t.mtx.Unlock()
merr := terrors.MultiError{}
for id, tenant := range t.tenants {
db := tenant.readyStorage().Get()
if db == nil {
level.Error(t.logger).Log("msg", "closing TSDB failed; not ready", "tenant", id)
continue
}
level.Info(t.logger).Log("msg", "closing TSDB", "tenant", id)
merr.Add(db.Close())
}
return merr.Err()
}
func (t *MultiTSDB) Sync(ctx context.Context) error {
if t.bucket == nil {
return errors.New("bucket is not specified, Sync should not be invoked")
}
t.mtx.RLock()
defer t.mtx.RUnlock()
errmtx := &sync.Mutex{}
merr := terrors.MultiError{}
wg := &sync.WaitGroup{}
for tenantID, tenant := range t.tenants {
level.Debug(t.logger).Log("msg", "uploading block for tenant", "tenant", tenantID)
s := tenant.shipper()
if s == nil {
continue
}
wg.Add(1)
go func() {
if uploaded, err := s.Sync(ctx); err != nil {
errmtx.Lock()
merr.Add(errors.Wrapf(err, "upload %d", uploaded))
errmtx.Unlock()
}
wg.Done()
}()
}
wg.Wait()
return merr.Err()
}
func (t *MultiTSDB) TSDBStores() map[string]storepb.StoreServer {
t.mtx.RLock()
defer t.mtx.RUnlock()
res := make(map[string]storepb.StoreServer, len(t.tenants))
for k, tenant := range t.tenants {
s := tenant.store()
if s != nil {
res[k] = s
}
}
return res
}
func (t *MultiTSDB) startTSDB(logger log.Logger, tenantID string, tenant *tenant) error {
reg := prometheus.WrapRegistererWith(prometheus.Labels{"tenant": tenantID}, t.reg)
lbls := append(t.labels, labels.Label{Name: t.tenantLabelName, Value: tenantID})
dataDir := path.Join(t.dataDir, tenantID)
level.Info(logger).Log("msg", "opening TSDB")
opts := *t.tsdbOpts
s, err := tsdb.Open(
dataDir,
logger,
&UnRegisterer{Registerer: reg},
&opts,
)
if err != nil {
t.mtx.Lock()
delete(t.tenants, tenantID)
t.mtx.Unlock()
return err
}
var ship *shipper.Shipper
if t.bucket != nil {
ship = shipper.New(
logger,
reg,
dataDir,
t.bucket,
func() labels.Labels { return lbls },
metadata.ReceiveSource,
t.allowOutOfOrderUpload,
)
}
tenant.set(store.NewTSDBStore(logger, reg, s, component.Receive, lbls), s, ship)
level.Info(logger).Log("msg", "TSDB is now ready")
return nil
}
func (t *MultiTSDB) getOrLoadTenant(tenantID string, blockingStart bool) (*tenant, error) {
// Fast path, as creating tenants is a very rare operation.
t.mtx.RLock()
tenant, exist := t.tenants[tenantID]
t.mtx.RUnlock()
if exist {
return tenant, nil
}
// Slow path needs to lock fully and attempt to read again to prevent race
// conditions, where since the fast path was tried, there may have actually
// been the same tenant inserted in the map.
t.mtx.Lock()
tenant, exist = t.tenants[tenantID]
if exist {
t.mtx.Unlock()
return tenant, nil
}
tenant = newTenant()
t.tenants[tenantID] = tenant
t.mtx.Unlock()
logger := log.With(t.logger, "tenant", tenantID)
if !blockingStart {
go func() {
if err := t.startTSDB(logger, tenantID, tenant); err != nil {
level.Error(logger).Log("msg", "failed to start tsdb asynchronously", "err", err)
}
}()
return tenant, nil
}
return tenant, t.startTSDB(logger, tenantID, tenant)
}
func (t *MultiTSDB) TenantAppendable(tenantID string) (Appendable, error) {
tenant, err := t.getOrLoadTenant(tenantID, false)
if err != nil {
return nil, err
}
return tenant.readyStorage(), nil
}
// ErrNotReady is returned if the underlying storage is not ready yet.
var ErrNotReady = errors.New("TSDB not ready")
// ReadyStorage implements the Storage interface while allowing to set the actual
// storage at a later point in time.
// TODO: Replace this with upstream Prometheus implementation when it is exposed.
type ReadyStorage struct {
mtx sync.RWMutex
a *adapter
}
// Set the storage.
func (s *ReadyStorage) Set(db *tsdb.DB) {
s.mtx.Lock()
defer s.mtx.Unlock()
s.a = &adapter{db: db}
}
// Get the storage.
func (s *ReadyStorage) Get() *tsdb.DB {
if x := s.get(); x != nil {
return x.db
}
return nil
}
func (s *ReadyStorage) get() *adapter {
s.mtx.RLock()
x := s.a
s.mtx.RUnlock()
return x
}
// StartTime implements the Storage interface.
func (s *ReadyStorage) StartTime() (int64, error) {
return 0, errors.New("not implemented")
}
// Querier implements the Storage interface.
func (s *ReadyStorage) Querier(ctx context.Context, mint, maxt int64) (storage.Querier, error) {
if x := s.get(); x != nil {
return x.Querier(ctx, mint, maxt)
}
return nil, ErrNotReady
}
// Appender implements the Storage interface.
func (s *ReadyStorage) Appender() (storage.Appender, error) {
if x := s.get(); x != nil {
return x.Appender()
}
return nil, ErrNotReady
}
// Close implements the Storage interface.
func (s *ReadyStorage) Close() error {
if x := s.Get(); x != nil {
return x.Close()
}
return nil
}
// adapter implements a storage.Storage around TSDB.
type adapter struct {
db *tsdb.DB
}
// StartTime implements the Storage interface.
func (a adapter) StartTime() (int64, error) {
return 0, errors.New("not implemented")
}
func (a adapter) Querier(ctx context.Context, mint, maxt int64) (storage.Querier, error) {
q, err := a.db.Querier(ctx, mint, maxt)
if err != nil {
return nil, err
}
return q, nil
}
// Appender returns a new appender against the storage.
func (a adapter) Appender() (storage.Appender, error) {
return a.db.Appender(), nil
}
// Close closes the storage and all its underlying resources.
func (a adapter) Close() error {
return a.db.Close()
}
// UnRegisterer is a Prometheus registerer that
// ensures that collectors can be registered
// by unregistering already-registered collectors.
// FlushableStorage uses this registerer in order
// to not lose metric values between DB flushes.
type UnRegisterer struct {
prometheus.Registerer
}
func (u *UnRegisterer) MustRegister(cs ...prometheus.Collector) {
for _, c := range cs {
if err := u.Register(c); err != nil {
if _, ok := err.(prometheus.AlreadyRegisteredError); ok {
if ok = u.Unregister(c); !ok {
panic("unable to unregister existing collector")
}
u.Registerer.MustRegister(c)
continue
}
panic(err)
}
}
}