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shard.go
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shard.go
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// Licensed to LinDB under one or more contributor
// license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright
// ownership. LinDB licenses this file to you under
// the Apache License, Version 2.0 (the "License"); you may
// not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.
package tsdb
import (
"context"
"fmt"
"io"
"sort"
"strconv"
"sync"
"time"
commonconstants "github.com/lindb/common/constants"
"go.uber.org/atomic"
"github.com/lindb/lindb/kv"
"github.com/lindb/lindb/metrics"
"github.com/lindb/lindb/models"
"github.com/lindb/lindb/pkg/logger"
"github.com/lindb/lindb/pkg/option"
"github.com/lindb/lindb/pkg/timeutil"
"github.com/lindb/lindb/series"
"github.com/lindb/lindb/series/field"
"github.com/lindb/lindb/series/metric"
"github.com/lindb/lindb/tsdb/indexdb"
"github.com/lindb/lindb/tsdb/memdb"
"github.com/lindb/lindb/tsdb/metadb"
"github.com/lindb/lindb/tsdb/tblstore/tagindex"
)
//go:generate mockgen -source=./shard.go -destination=./shard_mock.go -package=tsdb
// Shard is a horizontal partition of metrics for LinDB.
type Shard interface {
// Database returns the database.
Database() Database
// ShardID returns the shard id.
ShardID() models.ShardID
// CurrentInterval returns current interval for metric write.
CurrentInterval() timeutil.Interval
// Indicator returns the unique shard info.
Indicator() string
// GetOrCrateDataFamily returns data family, if not exist create a new data family.
GetOrCrateDataFamily(familyTime int64) (DataFamily, error)
// GetDataFamilies returns data family list by interval type and time range, return nil if not match
GetDataFamilies(intervalType timeutil.IntervalType, timeRange timeutil.TimeRange) []DataFamily
// IndexDatabase returns the index-database
IndexDatabase() indexdb.IndexDatabase
// BufferManager returns write temp memory manager.
BufferManager() memdb.BufferManager
// LookupRowMetricMeta lookups the metadata of metric data for each row with same family in batch.
LookupRowMetricMeta(rows []metric.StorageRow) error
// FlushIndex flushes index data to disk.
FlushIndex() error
// WaitFlushIndexCompleted waits flush index job completed.
WaitFlushIndexCompleted()
// initIndexDatabase initializes index database
initIndexDatabase() error
// TTL expires the data of each segment base on time to live.
TTL()
// EvictSegment evicts segment which long term no read operation.
EvictSegment()
// notifyLimitsChange notifies the limits changed.
notifyLimitsChange()
// Closer releases shard's resource, such as flush data, spawned goroutines etc.
io.Closer
}
// shard implements Shard interface
type shard struct {
db Database
indicator string // => db/shard
id models.ShardID
option *option.DatabaseOption
bufferMgr memdb.BufferManager
indexDB indexdb.IndexDatabase
metadata metadb.Metadata
// write accept time range
interval timeutil.Interval
// segments keeps all rollup target interval segments,
// includes one smallest interval segment for writing data, and rollup interval segments
rollupTargets map[timeutil.Interval]IntervalSegment
segment IntervalSegment // smallest interval for writing data
isFlushing atomic.Bool // restrict flusher concurrency
flushCondition *sync.Cond // flush condition
limits *models.Limits // NOTE: limits only update in write goroutine
limitsChanged atomic.Bool
indexStore kv.Store // kv stores
forwardFamily kv.Family // forward store
invertedFamily kv.Family // inverted store
logger *logger.Logger
statistics *metrics.ShardStatistics
}
// newShard creates shard instance, if shard path exist then load shard data for init.
// return error if create fail.
func newShard(
db Database,
shardID models.ShardID,
) (s Shard, err error) {
shardPath := shardPath(db.Name(), shardID)
err = mkDirIfNotExist(shardPath)
if err != nil {
return nil, err
}
dbOption := db.GetOption()
createdShard := &shard{
db: db,
indicator: shardIndicator(db.Name(), shardID),
id: shardID,
option: dbOption,
metadata: db.Metadata(),
bufferMgr: memdb.NewBufferManager(shardTempBufferPath(db.Name(), shardID)),
rollupTargets: make(map[timeutil.Interval]IntervalSegment),
isFlushing: *atomic.NewBool(false),
flushCondition: sync.NewCond(&sync.Mutex{}),
statistics: metrics.NewShardStatistics(db.Name(), strconv.Itoa(int(shardID))),
logger: logger.GetLogger("TSDB", "Shard"),
}
// try cleanup history dirty write buffer
createdShard.bufferMgr.Cleanup()
// sort intervals
sort.Sort(dbOption.Intervals)
createdShard.interval = dbOption.Intervals[0].Interval
for idx, targetInterval := range dbOption.Intervals {
// new segment for rollup
var segment IntervalSegment
segment, err = newIntervalSegmentFunc(createdShard, targetInterval)
if err != nil {
return nil, err
}
if idx == 0 {
// the smallest interval for writing
createdShard.segment = segment
}
// set rollup target segment
createdShard.rollupTargets[targetInterval.Interval] = segment
}
defer func() {
if err == nil {
return
}
if err0 := createdShard.Close(); err0 != nil {
engineLogger.Error("close shard error when create shard fail",
logger.String("database", createdShard.db.Name()),
logger.Any("shardID", createdShard.id), logger.Error(err0))
}
}()
if err = createdShard.initIndexDatabase(); err != nil {
return nil, fmt.Errorf("create index database for shard[%d] error: %s", shardID, err)
}
// init datatbase limits
createdShard.limits = db.GetLimits()
return createdShard, nil
}
// Database returns the database.
func (s *shard) Database() Database { return s.db }
// ShardID returns the shard id.
func (s *shard) ShardID() models.ShardID { return s.id }
// Indicator returns the unique shard info.
func (s *shard) Indicator() string { return s.indicator }
// notifyLimitsChange notifies the limits changed.
func (s *shard) notifyLimitsChange() {
s.limitsChanged.Store(true)
}
// CurrentInterval returns current interval for metric write.
func (s *shard) CurrentInterval() timeutil.Interval { return s.interval }
func (s *shard) IndexDatabase() indexdb.IndexDatabase { return s.indexDB }
// BufferManager returns write temp memory manager.
func (s *shard) BufferManager() memdb.BufferManager {
return s.bufferMgr
}
func (s *shard) GetOrCrateDataFamily(familyTime int64) (DataFamily, error) {
segmentName := s.interval.Calculator().GetSegment(familyTime)
// source segment
segment, err := s.segment.GetOrCreateSegment(segmentName)
if err != nil {
return nil, err
}
// build rollup target segment if set auto rollup interval
for interval, rollupSegment := range s.rollupTargets {
_, err = rollupSegment.GetOrCreateSegment(interval.Calculator().GetSegment(familyTime))
if err != nil {
return nil, err
}
}
family, err := segment.GetOrCreateDataFamily(familyTime)
if err != nil {
return nil, err
}
return family, nil
}
func (s *shard) GetDataFamilies(intervalType timeutil.IntervalType, timeRange timeutil.TimeRange) []DataFamily {
// first check query interval is writable interval.
if s.interval.Type() == intervalType || len(s.rollupTargets) == 1 {
// if no rollup, need to use current writable interval.
return s.segment.GetDataFamilies(timeRange)
}
// then find family from rollup targets
for interval, rollupSegment := range s.rollupTargets {
if interval.Type() == intervalType {
return rollupSegment.GetDataFamilies(timeRange)
}
}
return nil
}
func (s *shard) lookupRowMeta(row *metric.StorageRow) (err error) {
limits := s.limits
if s.limitsChanged.Load() {
// get new limits from database
// NOTE: modify limits in write goroutine
s.limits = s.db.GetLimits()
limits = s.limits
s.limitsChanged.Store(false)
}
namespace := commonconstants.DefaultNamespace
metricName := string(row.Name())
if len(row.NameSpace()) > 0 {
// TODO: add auto create ns check
namespace = string(row.NameSpace())
}
row.MetricID, err = s.metadata.MetadataDatabase().GenMetricID(namespace, metricName, limits)
if err != nil {
return err
}
var isCreated bool
if row.TagsLen() == 0 {
// if metric without tags, uses default series id(0)
row.SeriesID = series.IDWithoutTags
} else {
row.SeriesID, isCreated, err = s.indexDB.GetOrCreateSeriesID(namespace, metricName, row.MetricID, row.TagsHash(), limits)
if err != nil {
return err
}
}
if isCreated {
// if series id is new, need build inverted index
s.indexDB.BuildInvertIndex(
namespace,
metricName,
row.NewKeyValueIterator(),
row.SeriesID,
limits,
)
}
// set field id
simpleFieldItr := row.NewSimpleFieldIterator()
var fieldID field.ID
for simpleFieldItr.HasNext() {
if fieldID, err = s.metadata.MetadataDatabase().GenFieldID(
namespace, metricName,
simpleFieldItr.NextName(),
simpleFieldItr.NextType(), limits); err != nil {
// TODO: only ignore invalid field?
return err
}
row.FieldIDs = append(row.FieldIDs, fieldID)
}
compoundFieldItr, ok := row.NewCompoundFieldIterator()
if !ok {
goto Done
}
// min
if compoundFieldItr.Min() > 0 {
if fieldID, err = s.metadata.MetadataDatabase().GenFieldID(
namespace, metricName, compoundFieldItr.HistogramMinFieldName(), field.MinField, limits); err != nil {
return err
}
row.FieldIDs = append(row.FieldIDs, fieldID)
}
// max
if compoundFieldItr.Max() > 0 {
if fieldID, err = s.metadata.MetadataDatabase().GenFieldID(
namespace, metricName, compoundFieldItr.HistogramMaxFieldName(), field.MaxField, limits); err != nil {
return err
}
row.FieldIDs = append(row.FieldIDs, fieldID)
}
// sum
if fieldID, err = s.metadata.MetadataDatabase().GenFieldID(
namespace, metricName, compoundFieldItr.HistogramSumFieldName(), field.SumField, limits); err != nil {
return err
}
row.FieldIDs = append(row.FieldIDs, fieldID)
// count
if fieldID, err = s.metadata.MetadataDatabase().GenFieldID(
namespace, metricName, compoundFieldItr.HistogramCountFieldName(), field.SumField, limits); err != nil {
return err
}
row.FieldIDs = append(row.FieldIDs, fieldID)
// explicit bounds
for compoundFieldItr.HasNextBucket() {
if fieldID, err = s.metadata.MetadataDatabase().GenFieldID(
namespace, metricName,
compoundFieldItr.BucketName(), field.HistogramField, limits); err != nil {
return err
}
row.FieldIDs = append(row.FieldIDs, fieldID)
}
Done:
row.Writable = true
return nil
}
// LookupRowMetricMeta lookups the metadata of metric data for each row with same family in batch.
func (s *shard) LookupRowMetricMeta(rows []metric.StorageRow) error {
for idx := range rows {
if err := s.lookupRowMeta(&rows[idx]); err != nil {
s.statistics.LookupMetricMetaFailures.Incr()
s.logger.Error("failed to lookup meta of row",
logger.String("database", s.db.Name()),
logger.Any("shardID", s.id), logger.Error(err))
continue
}
}
return nil
}
func (s *shard) Close() error {
// finally, cleanup temp buffer.
defer s.bufferMgr.Cleanup()
// wait previous flush job completed
s.WaitFlushIndexCompleted()
if s.indexDB != nil {
if err := s.indexDB.Close(); err != nil {
return err
}
}
if s.indexStore != nil {
if err := kv.GetStoreManager().CloseStore(s.indexStore.Name()); err != nil {
return err
}
}
// close segment/flush family data
s.segment.Close()
for _, rollupSegment := range s.rollupTargets {
rollupSegment.Close()
}
return nil
}
// FlushIndex flushes index data to disk
func (s *shard) FlushIndex() (err error) {
// another flush process is running
if !s.isFlushing.CAS(false, true) {
return nil
}
// 1. mark flush job doing
startTime := time.Now()
defer func() {
s.flushCondition.L.Lock()
s.isFlushing.Store(false)
s.flushCondition.L.Unlock()
// mark flush job complete, notify
s.flushCondition.Broadcast()
s.statistics.IndexDBFlushDuration.UpdateSince(startTime)
}()
// index flush
if err = s.indexDB.Flush(); err != nil {
s.statistics.IndexDBFlushFailures.Incr()
s.logger.Error("failed to flush indexDB ",
logger.String("database", s.db.Name()),
logger.Any("shardID", s.id),
logger.Error(err))
return err
}
s.logger.Info("flush indexDB successfully",
logger.String("database", s.db.Name()),
logger.Any("shardID", s.id),
)
return nil
}
// WaitFlushIndexCompleted waits flush index job completed.
func (s *shard) WaitFlushIndexCompleted() {
s.flushCondition.L.Lock()
if s.isFlushing.Load() {
s.flushCondition.Wait()
}
s.flushCondition.L.Unlock()
}
// TTL expires the data of each segment base on time to live.
func (s *shard) TTL() {
for interval, rollupSegment := range s.rollupTargets {
if err := rollupSegment.TTL(); err != nil {
s.logger.Warn("do segment ttl failure",
logger.String("database", s.db.Name()),
logger.Any("shardID", s.id),
logger.String("segment", interval.Type().String()),
logger.Error(err),
)
}
}
}
// EvictSegment evicts segment which long term no read operation.
func (s *shard) EvictSegment() {
for _, rollupSegment := range s.rollupTargets {
rollupSegment.EvictSegment()
}
}
// initIndexDatabase initializes the index database
func (s *shard) initIndexDatabase() error {
var err error
s.indexStore, err = kv.GetStoreManager().CreateStore(shardIndexIndicator(s.db.Name(), s.id), kv.DefaultStoreOption())
if err != nil {
return err
}
s.forwardFamily, err = s.indexStore.CreateFamily(
forwardIndexDir,
kv.FamilyOption{
CompactThreshold: 0,
Merger: string(tagindex.SeriesForwardMerger)})
if err != nil {
return err
}
s.invertedFamily, err = s.indexStore.CreateFamily(
invertedIndexDir,
kv.FamilyOption{
CompactThreshold: 0,
Merger: string(tagindex.SeriesInvertedMerger)})
if err != nil {
return err
}
s.indexDB, err = newIndexDBFunc(
context.TODO(),
shardMetaPath(s.db.Name(), s.id),
s.metadata, s.forwardFamily,
s.invertedFamily)
if err != nil {
return err
}
return nil
}