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question 1:after return true when consumed, the message will never comes to you again unless commit fail.

question 2: rocketmq has two ways of consuming: cluster and broadcast.

i.e: 2 consumer instances, 100 messages sent,

for cluster: 50 for consumer instance 1, another 50 for consumer instance 2

for broadcast: 100 for consumer instance 1, same 100 for consumer instance 2