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service.go
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service.go
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package retention // import "github.com/influxdata/influxdb/services/retention"
import (
"io"
"log"
"os"
"sync"
"time"
"github.com/influxdata/influxdb/services/meta"
)
// Service represents the retention policy enforcement service.
type Service struct {
MetaClient interface {
Databases() []meta.DatabaseInfo
DeleteShardGroup(database, policy string, id uint64) error
}
TSDBStore interface {
ShardIDs() []uint64
DeleteShard(shardID uint64) error
}
enabled bool
checkInterval time.Duration
wg sync.WaitGroup
done chan struct{}
logger *log.Logger
}
// NewService returns a configured retention policy enforcement service.
func NewService(c Config) *Service {
return &Service{
checkInterval: time.Duration(c.CheckInterval),
done: make(chan struct{}),
logger: log.New(os.Stderr, "[retention] ", log.LstdFlags),
}
}
// Open starts retention policy enforcement.
func (s *Service) Open() error {
s.logger.Println("Starting retention policy enforcement service with check interval of", s.checkInterval)
s.wg.Add(2)
go s.deleteShardGroups()
go s.deleteShards()
return nil
}
// Close stops retention policy enforcement.
func (s *Service) Close() error {
s.logger.Println("retention policy enforcement terminating")
close(s.done)
s.wg.Wait()
return nil
}
// SetLogOutput sets the writer to which all logs are written. It must not be
// called after Open is called.
func (s *Service) SetLogOutput(w io.Writer) {
s.logger = log.New(w, "[retention] ", log.LstdFlags)
}
func (s *Service) deleteShardGroups() {
defer s.wg.Done()
ticker := time.NewTicker(s.checkInterval)
defer ticker.Stop()
for {
select {
case <-s.done:
return
case <-ticker.C:
dbs := s.MetaClient.Databases()
for _, d := range dbs {
for _, r := range d.RetentionPolicies {
for _, g := range r.ExpiredShardGroups(time.Now().UTC()) {
if err := s.MetaClient.DeleteShardGroup(d.Name, r.Name, g.ID); err != nil {
s.logger.Printf("failed to delete shard group %d from database %s, retention policy %s: %s",
g.ID, d.Name, r.Name, err.Error())
} else {
s.logger.Printf("deleted shard group %d from database %s, retention policy %s",
g.ID, d.Name, r.Name)
}
}
}
}
}
}
}
func (s *Service) deleteShards() {
defer s.wg.Done()
ticker := time.NewTicker(s.checkInterval)
defer ticker.Stop()
for {
select {
case <-s.done:
return
case <-ticker.C:
s.logger.Println("retention policy shard deletion check commencing")
type deletionInfo struct {
db string
rp string
}
deletedShardIDs := make(map[uint64]deletionInfo, 0)
dbs := s.MetaClient.Databases()
for _, d := range dbs {
for _, r := range d.RetentionPolicies {
for _, g := range r.DeletedShardGroups() {
for _, sh := range g.Shards {
deletedShardIDs[sh.ID] = deletionInfo{db: d.Name, rp: r.Name}
}
}
}
}
for _, id := range s.TSDBStore.ShardIDs() {
if di, ok := deletedShardIDs[id]; ok {
if err := s.TSDBStore.DeleteShard(id); err != nil {
s.logger.Printf("failed to delete shard ID %d from database %s, retention policy %s: %s",
id, di.db, di.rp, err.Error())
continue
}
s.logger.Printf("shard ID %d from database %s, retention policy %s, deleted",
id, di.db, di.rp)
}
}
}
}
}