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service.go
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service.go
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// Package retention provides the retention policy enforcement service.
package retention // import "github.com/influxdata/influxdb/services/retention"
import (
"sync"
"time"
"github.com/influxdata/influxdb/logger"
"github.com/influxdata/influxdb/services/meta"
"go.uber.org/zap"
)
// Service represents the retention policy enforcement service.
type Service struct {
MetaClient interface {
Databases() []meta.DatabaseInfo
DeleteShardGroup(database, policy string, id uint64) error
PruneShardGroups() error
}
TSDBStore interface {
ShardIDs() []uint64
DeleteShard(shardID uint64) error
}
config Config
wg sync.WaitGroup
done chan struct{}
logger *zap.Logger
}
// NewService returns a configured retention policy enforcement service.
func NewService(c Config) *Service {
return &Service{
config: c,
logger: zap.NewNop(),
}
}
// Open starts retention policy enforcement.
func (s *Service) Open() error {
if !s.config.Enabled || s.done != nil {
return nil
}
s.logger.Info("Starting retention policy enforcement service",
logger.DurationLiteral("check_interval", time.Duration(s.config.CheckInterval)))
s.done = make(chan struct{})
s.wg.Add(1)
go func() { defer s.wg.Done(); s.run() }()
return nil
}
// Close stops retention policy enforcement.
func (s *Service) Close() error {
if !s.config.Enabled || s.done == nil {
return nil
}
s.logger.Info("Closing retention policy enforcement service")
close(s.done)
s.wg.Wait()
s.done = nil
return nil
}
// WithLogger sets the logger on the service.
func (s *Service) WithLogger(log *zap.Logger) {
s.logger = log.With(zap.String("service", "retention"))
}
func (s *Service) run() {
ticker := time.NewTicker(time.Duration(s.config.CheckInterval))
defer ticker.Stop()
for {
select {
case <-s.done:
return
case <-ticker.C:
log, logEnd := logger.NewOperation(s.logger, "Retention policy deletion check", "retention_delete_check")
type deletionInfo struct {
db string
rp string
}
deletedShardIDs := make(map[uint64]deletionInfo)
// Mark down if an error occurred during this function so we can inform the
// user that we will try again on the next interval.
// Without the message, they may see the error message and assume they
// have to do it manually.
var retryNeeded bool
dbs := s.MetaClient.Databases()
for _, d := range dbs {
for _, r := range d.RetentionPolicies {
// Build list of already deleted shards.
for _, g := range r.DeletedShardGroups() {
for _, sh := range g.Shards {
deletedShardIDs[sh.ID] = deletionInfo{db: d.Name, rp: r.Name}
}
}
// Determine all shards that have expired and need to be deleted.
for _, g := range r.ExpiredShardGroups(time.Now().UTC()) {
if err := s.MetaClient.DeleteShardGroup(d.Name, r.Name, g.ID); err != nil {
log.Info("Failed to delete shard group",
logger.Database(d.Name),
logger.ShardGroup(g.ID),
logger.RetentionPolicy(r.Name),
zap.Error(err))
retryNeeded = true
continue
}
log.Info("Deleted shard group",
logger.Database(d.Name),
logger.ShardGroup(g.ID),
logger.RetentionPolicy(r.Name))
// Store all the shard IDs that may possibly need to be removed locally.
for _, sh := range g.Shards {
deletedShardIDs[sh.ID] = deletionInfo{db: d.Name, rp: r.Name}
}
}
}
}
// Remove shards if we store them locally
for _, id := range s.TSDBStore.ShardIDs() {
if info, ok := deletedShardIDs[id]; ok {
if err := s.TSDBStore.DeleteShard(id); err != nil {
log.Info("Failed to delete shard",
logger.Database(info.db),
logger.Shard(id),
logger.RetentionPolicy(info.rp),
zap.Error(err))
retryNeeded = true
continue
}
log.Info("Deleted shard",
logger.Database(info.db),
logger.Shard(id),
logger.RetentionPolicy(info.rp))
}
}
if err := s.MetaClient.PruneShardGroups(); err != nil {
log.Info("Problem pruning shard groups", zap.Error(err))
retryNeeded = true
}
if retryNeeded {
log.Info("One or more errors occurred during shard deletion and will be retried on the next check", logger.DurationLiteral("check_interval", time.Duration(s.config.CheckInterval)))
}
logEnd()
}
}
}