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manager.go
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manager.go
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package tsdb
import (
"context"
"fmt"
"os"
"path/filepath"
"strconv"
"sync"
"time"
"github.com/go-kit/log"
"github.com/go-kit/log/level"
"github.com/pkg/errors"
"github.com/prometheus/common/model"
"github.com/prometheus/prometheus/model/labels"
"github.com/grafana/loki/v3/pkg/storage/config"
"github.com/grafana/loki/v3/pkg/storage/stores/shipper/indexshipper"
"github.com/grafana/loki/v3/pkg/storage/stores/shipper/indexshipper/tsdb/index"
"github.com/grafana/loki/v3/pkg/storage/types"
util_log "github.com/grafana/loki/v3/pkg/util/log"
)
// nolint:revive
// TSDBManager wraps the index shipper and writes/manages
// TSDB files on disk
type TSDBManager interface {
Start() error
// Builds a new TSDB file from a set of WALs
BuildFromWALs(time.Time, []WALIdentifier, bool) error
// Builds a new TSDB file from tenantHeads
BuildFromHead(*tenantHeads) error
}
/*
tsdbManager is used for managing active index and is responsible for:
- Turning WALs into optimized multi-tenant TSDBs when requested
- Serving reads from these TSDBs
- Shipping them to remote storage
- Keeping them available for querying
- Removing old TSDBs which are no longer needed
*/
type tsdbManager struct {
nodeName string // node name
log log.Logger
name string
dir string
metrics *Metrics
tableRange config.TableRange
schemaCfg config.SchemaConfig
sync.RWMutex
shipper indexshipper.IndexShipper
}
func NewTSDBManager(
name,
nodeName,
dir string,
indexShipper indexshipper.IndexShipper,
tableRange config.TableRange,
schemaCfg config.SchemaConfig,
logger log.Logger,
metrics *Metrics,
) TSDBManager {
return &tsdbManager{
name: name,
nodeName: nodeName,
log: log.With(logger, "component", "tsdb-manager"),
dir: dir,
metrics: metrics,
tableRange: tableRange,
schemaCfg: schemaCfg,
shipper: indexShipper,
}
}
func (m *tsdbManager) Start() (err error) {
var (
buckets, indices, loadingErrors int
)
defer func() {
level.Info(m.log).Log(
"msg", "loaded leftover local indices",
"err", err,
"successful", err == nil,
"buckets", buckets,
"indices", indices,
"failures", loadingErrors,
)
}()
// load list of multitenant tsdbs
mulitenantDir := managerMultitenantDir(m.dir)
files, err := os.ReadDir(mulitenantDir)
if err != nil {
return err
}
for _, f := range files {
if !f.IsDir() {
continue
}
bucket := f.Name()
if ok, err := m.tableRange.TableInRange(bucket); !ok {
level.Info(m.log).Log("msg", fmt.Sprintf("skip loading, table not in range: %s", f.Name()), "reason", err)
continue
}
buckets++
tsdbs, err := os.ReadDir(filepath.Join(mulitenantDir, bucket))
if err != nil {
level.Warn(m.log).Log(
"msg", "failed to open period bucket dir",
"bucket", bucket,
"err", err.Error(),
)
continue
}
for _, db := range tsdbs {
id, ok := parseMultitenantTSDBPath(db.Name())
if !ok {
continue
}
indices++
prefixed := NewPrefixedIdentifier(id, filepath.Join(mulitenantDir, bucket), "")
loaded, err := NewShippableTSDBFile(prefixed)
if err != nil {
level.Warn(m.log).Log(
"msg", "",
"tsdbPath", prefixed.Path(),
"err", err.Error(),
)
loadingErrors++
}
if err := m.shipper.AddIndex(bucket, "", loaded); err != nil {
loadingErrors++
return err
}
}
}
return nil
}
type chunkInfo struct {
chunkMetas index.ChunkMetas
tsdbFormat int
}
func (m *tsdbManager) buildFromHead(heads *tenantHeads, indexShipper indexshipper.IndexShipper, tableRanges []config.TableRange) (err error) {
periods := make(map[string]*Builder)
if err := heads.forAll(func(user string, ls labels.Labels, fp uint64, chks index.ChunkMetas) error {
// chunks may overlap index period bounds, in which case they're written to multiple
pds := make(map[string]chunkInfo)
for _, chk := range chks {
idxBuckets := indexBuckets(chk.From(), chk.Through(), tableRanges)
for _, bucket := range idxBuckets {
chkinfo := pds[bucket.prefix]
chkinfo.chunkMetas = append(chkinfo.chunkMetas, chk)
chkinfo.tsdbFormat = bucket.tsdbFormat
pds[bucket.prefix] = chkinfo
}
}
// Embed the tenant label into TSDB
lb := labels.NewBuilder(ls)
lb.Set(TenantLabel, user)
withTenant := lb.Labels()
// Add the chunks to all relevant builders
for pd, chkinfo := range pds {
matchingChks := chkinfo.chunkMetas
b, ok := periods[pd]
if !ok {
b = NewBuilder(chkinfo.tsdbFormat)
periods[pd] = b
}
b.AddSeries(
withTenant,
// use the fingerprint without the added tenant label
// so queries route to the chunks which actually exist.
model.Fingerprint(fp),
matchingChks,
)
}
return nil
}); err != nil {
level.Error(m.log).Log("err", err.Error(), "msg", "building TSDB")
return err
}
for p, b := range periods {
dstDir := filepath.Join(managerMultitenantDir(m.dir), fmt.Sprint(p))
dst := NewPrefixedIdentifier(
MultitenantTSDBIdentifier{
nodeName: m.nodeName,
ts: heads.start,
},
dstDir,
"",
)
level.Debug(m.log).Log("msg", "building tsdb for period", "pd", p, "dst", dst.Path())
// build+move tsdb to multitenant dir
start := time.Now()
_, err = b.Build(
context.Background(),
filepath.Join(managerScratchDir(m.dir), m.name),
func(from, through model.Time, checksum uint32) Identifier {
return dst
},
)
if err != nil {
return err
}
level.Debug(m.log).Log("msg", "finished building tsdb for period", "pd", p, "dst", dst.Path(), "duration", time.Since(start))
loaded, err := NewShippableTSDBFile(dst)
if err != nil {
return err
}
if err := indexShipper.AddIndex(p, "", loaded); err != nil {
return err
}
}
m.metrics.tsdbBuildLastSuccess.SetToCurrentTime()
return nil
}
func (m *tsdbManager) BuildFromHead(heads *tenantHeads) (err error) {
level.Debug(m.log).Log("msg", "building heads")
defer func() {
status := statusSuccess
if err != nil {
status = statusFailure
}
m.metrics.tsdbBuilds.WithLabelValues(status, "head").Inc()
}()
return m.buildFromHead(heads, m.shipper, []config.TableRange{m.tableRange})
}
func (m *tsdbManager) BuildFromWALs(t time.Time, ids []WALIdentifier, legacy bool) (err error) {
level.Debug(m.log).Log("msg", "building WALs", "n", len(ids), "ts", t)
defer func() {
status := statusSuccess
if err != nil {
status = statusFailure
}
m.metrics.tsdbBuilds.WithLabelValues(status, "wal").Inc()
}()
var (
tableRanges = []config.TableRange{m.tableRange}
indexShipper = m.shipper
)
if legacy {
// pass all TSDB tableRanges as the legacy WAL files are not period specific.
tableRanges = config.GetIndexStoreTableRanges(types.TSDBType, m.schemaCfg.Configs)
// do not ship legacy WAL files.
// TSDBs built from these WAL files would get loaded on starting tsdbManager
indexShipper = indexshipper.Noop{}
}
level.Debug(m.log).Log("msg", "recovering tenant heads")
for _, id := range ids {
tmp := newTenantHeads(id.ts, defaultHeadManagerStripeSize, m.metrics, m.log)
if err = recoverHead(m.name, m.dir, tmp, []WALIdentifier{id}, legacy); err != nil {
return errors.Wrap(err, "building TSDB from WALs")
}
err := m.buildFromHead(tmp, indexShipper, tableRanges)
if err != nil {
return err
}
}
return nil
}
type indexInfo struct {
prefix string
tsdbFormat int
}
func indexBuckets(from, through model.Time, tableRanges config.TableRanges) (res []indexInfo) {
start := from.Time().UnixNano() / int64(config.ObjectStorageIndexRequiredPeriod)
end := through.Time().UnixNano() / int64(config.ObjectStorageIndexRequiredPeriod)
for cur := start; cur <= end; cur++ {
cfg := tableRanges.ConfigForTableNumber(cur)
if cfg != nil {
tsdbFormat, _ := cfg.TSDBFormat() // Ignoring error, as any valid period config should return valid format.
res = append(res, indexInfo{prefix: cfg.IndexTables.Prefix + strconv.Itoa(int(cur)), tsdbFormat: tsdbFormat})
}
}
if len(res) == 0 {
level.Warn(util_log.Logger).Log("err", "could not find config for table(s) from: %d, through %d", start, end)
}
return
}