EAHITechnology commented on a change in pull request #696:
URL: https://github.com/apache/pulsar-client-go/pull/696#discussion_r784657424
##########
File path: pulsar/reader_partition.go
##########
@@ -0,0 +1,142 @@
+package pulsar
+
+import (
+ "sync"
+ "time"
+)
+
+func (r *reader) internalTopicReadToPartitions() error {
+ partitions, err := r.client.TopicPartitions(r.topic)
+ if err != nil {
+ return err
+ }
+
+ oldNumPartitions, newNumPartitions := 0, len(partitions)
+
+ r.Lock()
+ defer r.Unlock()
+
+ oldReaders, oldNumPartitions := r.consumers, len(r.consumers)
+ if oldReaders != nil {
+ if oldNumPartitions == newNumPartitions {
+ r.log.Debug("Number of partitions in topic has not
changed")
+ return nil
+ }
+
+ r.log.WithField("old_partitions", oldNumPartitions).
+ WithField("new_partitions", newNumPartitions).
+ Info("Changed number of partitions in topic")
+ }
+
+ r.consumers = make([]*partitionConsumer, newNumPartitions)
+
+ // When for some reason (eg: forced deletion of sub partition) causes
oldNumPartitions> newNumPartitions,
+ // we need to rebuild the cache of new consumers, otherwise the array
will be out of bounds.
+ if oldReaders != nil && oldNumPartitions < newNumPartitions {
+ // Copy over the existing consumer instances
+ for i := 0; i < oldNumPartitions; i++ {
+ r.consumers[i] = oldReaders[i]
+ }
+ }
+
+ type ConsumerError struct {
+ err error
+ partition int
+ consumer *partitionConsumer
+ }
+
+ subscriptionName := r.options.SubscriptionRolePrefix
+ if subscriptionName == "" {
+ subscriptionName = "reader"
+ }
+ subscriptionName += "-" + generateRandomName()
+
+ startMessageID, ok := toTrackingMessageID(r.options.StartMessageID)
+ if !ok {
+ // a custom type satisfying MessageID may not be a messageID or
trackingMessageID
+ // so re-create messageID using its data
+ deserMsgID, err :=
deserializeMessageID(r.options.StartMessageID.Serialize())
+ if err != nil {
+ return err
+ }
+ // de-serialized MessageID is a messageID
+ startMessageID = trackingMessageID{
+ messageID: deserMsgID.(messageID),
+ receivedTime: time.Now(),
+ }
+ }
+
+ startPartition := oldNumPartitions
+ partitionsToAdd := newNumPartitions - oldNumPartitions
+
+ if partitionsToAdd < 0 {
+ partitionsToAdd = newNumPartitions
+ startPartition = 0
+ }
+
+ var wg sync.WaitGroup
+ ch := make(chan ConsumerError, partitionsToAdd)
+ wg.Add(partitionsToAdd)
+
+ for partitionIdx := startPartition; partitionIdx < newNumPartitions;
partitionIdx++ {
+ partitionTopic := partitions[partitionIdx]
+
+ go func(idx int, pt string) {
+ defer wg.Done()
+
+ opts := &partitionConsumerOpts{
+ topic: pt,
+ consumerName: r.options.Name,
+ subscription: subscriptionName,
+ subscriptionType: Exclusive,
+ partitionIdx: idx,
+ receiverQueueSize:
r.options.ReceiverQueueSize,
+ nackRedeliveryDelay:
defaultNackRedeliveryDelay,
+ metadata:
r.options.Properties,
+ replicateSubscriptionState: false,
+ startMessageID: startMessageID,
+ subscriptionMode: durable,
Review comment:
done
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