The lag can not be committed to zero

[MoneySuccess]

dears
I have tried this library , it works very well except one small problem.
The lag can not be committed to zero.For example,if there is 20 messages in the partition, when i call the commit method, the offset in that partition is always 19, there is still one message can not be committed and the lag is 1.
I have tried to attempted the problem as best as my can, but it do not work,so i need your help.
Thanks very much!

[ducas]

Duplicate of #27

[MoneySuccess]

@ducas thank you for your reply .My English is poor,so I'm afraid I don't have a clear expression, thank you again.
I have checked the #27 , I think it is the same problem , I have tried the latest library , but it does not works when using kafka 0.8.2.2 ,so it is with 0.9.0.1.
I have also tried The #47 , but it the lag is still 1 . Something is more interesting is that when I using kafka 0.9.0.1, I can not produce or consume any messages from kafka with this library.
Looking forward to your reply,thank you very much!