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store.go
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store.go
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package tsdb
import (
"fmt"
"io/ioutil"
"log"
"os"
"path/filepath"
"strconv"
"strings"
"sync"
"time"
"github.com/influxdb/influxdb/influxql"
)
func NewStore(path string) *Store {
return &Store{
path: path,
MaxWALSize: DefaultMaxWALSize,
WALFlushInterval: DefaultWALFlushInterval,
WALPartitionFlushDelay: DefaultWALPartitionFlushDelay,
Logger: log.New(os.Stderr, "[store] ", log.LstdFlags),
}
}
var (
ErrShardNotFound = fmt.Errorf("shard not found")
)
type Store struct {
mu sync.RWMutex
path string
databaseIndexes map[string]*DatabaseIndex
shards map[uint64]*Shard
MaxWALSize int
WALFlushInterval time.Duration
WALPartitionFlushDelay time.Duration
Logger *log.Logger
}
// Path returns the store's root path.
func (s *Store) Path() string { return s.path }
func (s *Store) CreateShard(database, retentionPolicy string, shardID uint64) error {
s.mu.Lock()
defer s.mu.Unlock()
// shard already exists
if _, ok := s.shards[shardID]; ok {
return nil
}
// created the db and retention policy dirs if they don't exist
if err := os.MkdirAll(filepath.Join(s.path, database, retentionPolicy), 0700); err != nil {
return err
}
// create the database index if it does not exist
db, ok := s.databaseIndexes[database]
if !ok {
db = NewDatabaseIndex()
s.databaseIndexes[database] = db
}
shardPath := filepath.Join(s.path, database, retentionPolicy, strconv.FormatUint(shardID, 10))
shard := s.newShard(db, shardPath)
if err := shard.Open(); err != nil {
return err
}
s.shards[shardID] = shard
return nil
}
// DeleteShard removes a shard from disk.
func (s *Store) DeleteShard(shardID uint64) error {
s.mu.Lock()
defer s.mu.Unlock()
// ensure shard exists
sh, ok := s.shards[shardID]
if !ok {
return nil
}
if err := sh.Close(); err != nil {
return err
}
if err := os.Remove(sh.path); err != nil {
return err
}
delete(s.shards, shardID)
return nil
}
// newShard returns a shard and copies configuration settings from the store.
func (s *Store) newShard(index *DatabaseIndex, path string) *Shard {
sh := NewShard(index, path)
sh.MaxWALSize = s.MaxWALSize
sh.WALFlushInterval = s.WALFlushInterval
sh.WALPartitionFlushDelay = s.WALPartitionFlushDelay
return sh
}
// DeleteDatabase will close all shards associated with a database and remove the directory and files from disk.
func (s *Store) DeleteDatabase(name string, shardIDs []uint64) error {
s.mu.Lock()
defer s.mu.Unlock()
for _, id := range shardIDs {
shard := s.shards[id]
if shard != nil {
shard.Close()
}
}
if err := os.RemoveAll(filepath.Join(s.path, name)); err != nil {
return err
}
delete(s.databaseIndexes, name)
return nil
}
func (s *Store) Shard(shardID uint64) *Shard {
s.mu.RLock()
defer s.mu.RUnlock()
return s.shards[shardID]
}
// ShardIDs returns a slice of all ShardIDs under management.
func (s *Store) ShardIDs() []uint64 {
ids := make([]uint64, 0, len(s.shards))
for i, _ := range s.shards {
ids = append(ids, i)
}
return ids
}
func (s *Store) ValidateAggregateFieldsInStatement(shardID uint64, measurementName string, stmt *influxql.SelectStatement) error {
s.mu.RLock()
shard := s.shards[shardID]
s.mu.RUnlock()
if shard == nil {
return ErrShardNotFound
}
return shard.ValidateAggregateFieldsInStatement(measurementName, stmt)
}
func (s *Store) DatabaseIndex(name string) *DatabaseIndex {
s.mu.RLock()
defer s.mu.RUnlock()
return s.databaseIndexes[name]
}
func (s *Store) Measurement(database, name string) *Measurement {
s.mu.RLock()
db := s.databaseIndexes[database]
s.mu.RUnlock()
if db == nil {
return nil
}
return db.Measurement(name)
}
// deleteSeries loops through the local shards and deletes the series data and metadata for the passed in series keys
func (s *Store) deleteSeries(keys []string) error {
s.mu.RLock()
defer s.mu.RUnlock()
for _, sh := range s.shards {
if err := sh.deleteSeries(keys); err != nil {
return err
}
}
return nil
}
// deleteMeasurement loops through the local shards and removes the measurement field encodings from each shard
func (s *Store) deleteMeasurement(name string, seriesKeys []string) error {
s.mu.RLock()
defer s.mu.RUnlock()
for _, sh := range s.shards {
if err := sh.deleteMeasurement(name, seriesKeys); err != nil {
return err
}
}
return nil
}
func (s *Store) loadIndexes() error {
dbs, err := ioutil.ReadDir(s.path)
if err != nil {
return err
}
for _, db := range dbs {
if !db.IsDir() {
s.Logger.Printf("Skipping database dir: %s. Not a directory", db.Name())
continue
}
s.databaseIndexes[db.Name()] = NewDatabaseIndex()
}
return nil
}
func (s *Store) loadShards() error {
// loop through the current database indexes
for db := range s.databaseIndexes {
rps, err := ioutil.ReadDir(filepath.Join(s.path, db))
if err != nil {
return err
}
for _, rp := range rps {
// retention policies should be directories. Skip anything that is not a dir.
if !rp.IsDir() {
s.Logger.Printf("Skipping retention policy dir: %s. Not a directory", rp.Name())
continue
}
shards, err := ioutil.ReadDir(filepath.Join(s.path, db, rp.Name()))
if err != nil {
return err
}
for _, sh := range shards {
path := filepath.Join(s.path, db, rp.Name(), sh.Name())
// Shard file names are numeric shardIDs
shardID, err := strconv.ParseUint(sh.Name(), 10, 64)
if err != nil {
s.Logger.Printf("Skipping shard: %s. Not a valid path", rp.Name())
continue
}
shard := s.newShard(s.databaseIndexes[db], path)
shard.Open()
s.shards[shardID] = shard
}
}
}
return nil
}
func (s *Store) Open() error {
s.mu.Lock()
defer s.mu.Unlock()
s.shards = map[uint64]*Shard{}
s.databaseIndexes = map[string]*DatabaseIndex{}
// Create directory.
if err := os.MkdirAll(s.path, 0777); err != nil {
return err
}
// TODO: Start AE for Node
if err := s.loadIndexes(); err != nil {
return err
}
if err := s.loadShards(); err != nil {
return err
}
return nil
}
func (s *Store) WriteToShard(shardID uint64, points []Point) error {
s.mu.RLock()
defer s.mu.RUnlock()
sh, ok := s.shards[shardID]
if !ok {
return ErrShardNotFound
}
return sh.WritePoints(points)
}
// Flush forces all shards to write their WAL data to the index.
func (s *Store) Flush() error {
s.mu.RLock()
defer s.mu.RUnlock()
for shardID, sh := range s.shards {
if err := sh.Flush(s.WALPartitionFlushDelay); err != nil {
return fmt.Errorf("flush: shard=%d, err=%s", shardID, err)
}
}
return nil
}
func (s *Store) CreateMapper(shardID uint64, query string, chunkSize int) (Mapper, error) {
q, err := influxql.NewParser(strings.NewReader(query)).ParseStatement()
if err != nil {
return nil, err
}
stmt, ok := q.(*influxql.SelectStatement)
if !ok {
return nil, fmt.Errorf("query is not a SELECT statement: %s", err.Error())
}
shard := s.Shard(shardID)
if shard == nil {
// This can happen if the shard has been assigned, but hasn't actually been created yet.
return nil, nil
}
if (stmt.IsRawQuery && !stmt.HasDistinct()) || stmt.IsSimpleDerivative() {
return NewRawMapper(shard, stmt, chunkSize), nil
}
return NewAggMapper(shard, stmt), nil
}
func (s *Store) Close() error {
s.mu.Lock()
defer s.mu.Unlock()
for _, sh := range s.shards {
if err := sh.Close(); err != nil {
return err
}
}
s.shards = nil
s.databaseIndexes = nil
return nil
}
// IsRetryable returns true if this error is temporary and could be retried
func IsRetryable(err error) bool {
if err == nil {
return true
}
if strings.Contains(err.Error(), "field type conflict") {
return false
}
return true
}