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Merge pull request #523 from raintank/replicatorUpdate
Replicator update
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,125 @@ | ||
| package main | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "time" | ||
|
|
||
| "github.com/Shopify/sarama" | ||
| "github.com/bsm/sarama-cluster" | ||
| "github.com/raintank/worldping-api/pkg/log" | ||
| ) | ||
|
|
||
| type PersistReplicator struct { | ||
| consumer *cluster.Consumer | ||
| producer sarama.SyncProducer | ||
| destTopic string | ||
| done chan struct{} | ||
| } | ||
|
|
||
| func NewPersistReplicator(srcBrokers []string, dstBrokers []string, group, srcTopic, destTopic string, initialOffset int) (*PersistReplicator, error) { | ||
| config := cluster.NewConfig() | ||
| config.Consumer.Offsets.Initial = int64(initialOffset) | ||
| config.ClientID = "mt-persist-replicator" | ||
| config.Group.Return.Notifications = true | ||
| config.ChannelBufferSize = 1000 | ||
| config.Consumer.Fetch.Min = 1 | ||
| config.Consumer.Fetch.Default = 32768 | ||
| config.Consumer.MaxWaitTime = time.Second | ||
| config.Consumer.MaxProcessingTime = time.Second | ||
| config.Producer.RequiredAcks = sarama.WaitForAll // Wait for all in-sync replicas to ack the message | ||
| config.Producer.Retry.Max = 10 // Retry up to 10 times to produce the message | ||
| config.Producer.Compression = sarama.CompressionSnappy | ||
| config.Config.Version = sarama.V0_10_0_0 | ||
| err := config.Validate() | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| consumer, err := cluster.NewConsumer(srcBrokers, fmt.Sprintf("%s-persist", group), []string{srcTopic}, config) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| producer, err := sarama.NewSyncProducer(dstBrokers, &config.Config) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| return &PersistReplicator{ | ||
| consumer: consumer, | ||
| producer: producer, | ||
| destTopic: destTopic, | ||
| done: make(chan struct{}), | ||
| }, nil | ||
| } | ||
|
|
||
| func (r *PersistReplicator) Consume() { | ||
| accountingTicker := time.NewTicker(time.Second * 10) | ||
| flushTicker := time.NewTicker(time.Second) | ||
| counter := 0 | ||
| counterTs := time.Now() | ||
| msgChan := r.consumer.Messages() | ||
| var m *sarama.ConsumerMessage | ||
| var ok bool | ||
|
|
||
| buf := make([]*sarama.ProducerMessage, 0) | ||
| defer close(r.done) | ||
| for { | ||
| select { | ||
| case m, ok = <-msgChan: | ||
| if !ok { | ||
| if len(buf) != 0 { | ||
| r.Flush(buf) | ||
| } | ||
| return | ||
| } | ||
| log.Debug("received metricPersist message with key: %s", m.Key) | ||
| msg := &sarama.ProducerMessage{ | ||
| Key: sarama.ByteEncoder(m.Key), | ||
| Topic: r.destTopic, | ||
| Value: sarama.ByteEncoder(m.Value), | ||
| } | ||
| buf = append(buf, msg) | ||
| if len(buf) >= 1000 { | ||
| r.Flush(buf) | ||
| counter += len(buf) | ||
| buf = buf[:0] | ||
| r.consumer.MarkPartitionOffset(m.Topic, m.Partition, m.Offset, "") | ||
| } | ||
| case <-flushTicker.C: | ||
| if len(buf) == 0 { | ||
| continue | ||
| } | ||
| r.Flush(buf) | ||
| counter += len(buf) | ||
| buf = buf[:0] | ||
| r.consumer.MarkPartitionOffset(m.Topic, m.Partition, m.Offset, "") | ||
| case t := <-accountingTicker.C: | ||
| log.Info("%d metricpersist messages procesed in last %.1fseconds.", counter, t.Sub(counterTs).Seconds()) | ||
| counter = 0 | ||
| counterTs = t | ||
| } | ||
| } | ||
|
|
||
| } | ||
|
|
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| func (r *PersistReplicator) Flush(buf []*sarama.ProducerMessage) { | ||
| for { | ||
| err := r.producer.SendMessages(buf) | ||
| if err != nil { | ||
| log.Error(3, "failed to publish metricPersist message. %s . trying again in 1second", err) | ||
| time.Sleep(time.Second) | ||
| } else { | ||
| return | ||
| } | ||
| } | ||
| } | ||
|
|
||
| func (r *PersistReplicator) Stop() { | ||
| r.consumer.Close() | ||
| <-r.done | ||
| r.producer.Close() | ||
| } | ||
|
|
||
| func (r *PersistReplicator) Start() { | ||
| go r.Consume() | ||
| } |
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