Fix discard unacked messages #413
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aahmed-se
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wolfstudy
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#389 (comment)
Motivation
When a consumer whose receive queue is not empty reconnects to a broker, unacked messages don't be redelivered to a client application and these are removed from backlog.
This is because StartMessageID is updated and the consumer implicitly acks redelivered unacked messages.
https://github.com/apache/pulsar-client-go/blob/v0.3.0/pulsar/consumer_partition.go#L972-L976
https://github.com/apache/pulsar-client-go/blob/v0.3.0/pulsar/consumer_partition.go#L507-L510
Modifications
.https://github.com/apache/pulsar-client-go/blob/v0.3.0/pulsar/consumer_partition.go#L507-L510