codelipenghui commented on issue #6731: Failing to acknowledge messages during pulsar reconnection URL: https://github.com/apache/pulsar/issues/6731#issuecomment-613183651 Looks the problem is the message does not remove from the receiver queue when the consumer acknowledges messages. So it's better to skip messages that already acknowledged by the consumer. BTW, currently, message acknowledgment is asynchronous execution. Even if you ack a message then the consumer reconnects occurs, the consumer will also receive duplicate messages.
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