No need to call GetPartitionedTopicMetadata for old topics if user specifies DeadLetterTopic/RetryLetterTopic in options.DLQ

[Kybxd]

pulsar-client-go/pulsar/consumer_impl.go

Lines 147 to 178 in cc18590

	retryTopic := topicName + "-" + options.SubscriptionName + RetryTopicSuffix
	dlqTopic := topicName + "-" + options.SubscriptionName + DlqTopicSuffix
	oldRetryTopic := tn.Domain + "://" + tn.Namespace + "/" + options.SubscriptionName + RetryTopicSuffix
	oldDlqTopic := tn.Domain + "://" + tn.Namespace + "/" + options.SubscriptionName + DlqTopicSuffix
	if r, err := client.lookupService.GetPartitionedTopicMetadata(oldRetryTopic); err == nil &&
	r != nil &&
	r.Partitions > 0 {
	retryTopic = oldRetryTopic
	}
	if r, err := client.lookupService.GetPartitionedTopicMetadata(oldDlqTopic); err == nil &&
	r != nil &&
	r.Partitions > 0 {
	dlqTopic = oldDlqTopic
	}
	if options.DLQ == nil {
	options.DLQ = &DLQPolicy{
	MaxDeliveries: MaxReconsumeTimes,
	DeadLetterTopic: dlqTopic,
	RetryLetterTopic: retryTopic,
	}
	} else {
	if options.DLQ.DeadLetterTopic == "" {
	options.DLQ.DeadLetterTopic = dlqTopic
	}
	if options.DLQ.RetryLetterTopic == "" {
	options.DLQ.RetryLetterTopic = retryTopic
	}
	}

[zjxxzjwang]

I will solve this problem