[fix] Redeliver messages that can't be decrypted. #160
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Master Issue: apache/pulsar#3097
Motivation
Customers who can't decrypt their message must be given a chance to re-decrypt the message if redelivery is enabled.
Modifications
unAckedMessageTrackerPtr_
to wait for redelivery.Verifying this change
testRedeliveryOfDecryptionFailedMessages
to cover it.Documentation
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